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Zhao M, Shu G, Hu Y, Cao G, Wang Y. Pattern and variation in simple sequence repeat (SSR) at different genomic regions and its implications to maize evolution and breeding. BMC Genomics 2023; 24:136. [PMID: 36944913 PMCID: PMC10029318 DOI: 10.1186/s12864-023-09156-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Accepted: 01/30/2023] [Indexed: 03/23/2023] Open
Abstract
BACKGROUND Repetitive DNA sequences accounts for over 80% of maize genome. Although simple sequence repeats (SSRs) account for only 0.03% of the genome, they have been widely used in maize genetic research and breeding as highly informative codominant DNA markers. The genome-wide distribution and polymorphism of SSRs are not well studied due to the lack of high-quality genome DNA sequence data. RESULTS In this study, using data from high-quality de novo-sequenced maize genomes of five representative maize inbred lines, we revealed that SSRs were more densely present in telomeric region than centromeric region, and were more abundant in genic sequences than intergenic sequences. On genic sequences, tri- and hexanucleotide motifs were more abundant in CDS sequence and some mono- and dinucleotide motifs were more abundant in UTR sequences. Median length and chromosomal density of SSRs were both narrowly range-bound, with median length of 14-18 bp and genome-wide average density of 3355.77 bp/Mbp. LTR-RTs of < 0.4 Mya had higher SSR density (4498-4992 bp/Mbp). The genome-specific and motif-specific SSR polymorphism were studied. Their potential breeding applications were discussed. CONCLUSIONS We found that the median length of SSR sequences of different SSR motifs was nearly constant. SSR density in genic regions was much higher than intergenic regions. In addition, SSR density at LTR-RTs of different evolutionary ages varied in a narrow range. The SSRs and their LTR-RT carriers evolved at an equal rate. All these observations indicated that SSR length and density were under control of yet unknown evolutionary forces. The chromosome region-specific and motif-specific SSR polymorphisms we observed supported the notion that SSR polymorphism was invaluable genome resource for developing highly informative genome and gene markers in maize genetic research and molecular breeding.
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Affiliation(s)
- Meiqi Zhao
- Zhengzhou University Graduate Student Training Base at Beijing Lantron Seed, Zhengzhou, 450001, China
- School of Agricultural Sciences, Zhengzhou University, Zhengzhou, 450001, China
| | - Guoping Shu
- Zhengzhou University Graduate Student Training Base at Beijing Lantron Seed, Zhengzhou, 450001, China
- Center of Biotechnology, Beijing Lantron Seed, Zhengzhou, 450001, China
| | - Yanhong Hu
- Zhengzhou University Graduate Student Training Base at Beijing Lantron Seed, Zhengzhou, 450001, China
- Center of Biotechnology, Beijing Lantron Seed, Zhengzhou, 450001, China
| | - Gangqiang Cao
- Zhengzhou University Graduate Student Training Base at Beijing Lantron Seed, Zhengzhou, 450001, China.
- School of Agricultural Sciences, Zhengzhou University, Zhengzhou, 450001, China.
| | - Yibo Wang
- Zhengzhou University Graduate Student Training Base at Beijing Lantron Seed, Zhengzhou, 450001, China.
- Center of Biotechnology, Beijing Lantron Seed, Zhengzhou, 450001, China.
- Henan LongPing-Lantron AgriScience & Technology Co., LTD, Zhengzhou, 450001, China.
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Singh S, Sharma R, Nepolean T, Nayak SN, Pushpavathi B, Khan AW, Srivastava RK, Varshney RK. Identification of genes controlling compatible and incompatible reactions of pearl millet ( Pennisetum glaucum) against blast ( Magnaporthe grisea) pathogen through RNA-Seq. FRONTIERS IN PLANT SCIENCE 2022; 13:981295. [PMID: 36212352 PMCID: PMC9544386 DOI: 10.3389/fpls.2022.981295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2022] [Accepted: 08/11/2022] [Indexed: 06/16/2023]
Abstract
Blast [Magnaporthe grisea (Herbert) Barr] is an economically important disease in Asian pearl millet production ecologies. The recurrent occurrence of blast in the past one decade has caused enormous strain on grain and forage production. Identification of resistance genes is an important step to develop durable varieties. The present study is the first attempt to use RNA-Seq to investigate the transcript dynamics in a pearl millet inbred ICMB 93333, which had a unique differential reaction to two isolates-Pg 45 (avirulent) and Pg 174 (virulent) of M. grisea. The inbred was inoculated by both isolates and samples taken at six different time intervals for genome-wide RNA-Seq experiment. The transcriptome results revealed the differential expression of more than 2,300 genes. The time-specific comparison showed activation or repression of specific genes in various pathways. Genes and transcriptions factors related to pathogenesis-related proteins, reactive oxygen species generating and its scavenging genes, cell wall defense, primary and secondary metabolic pathways, and signaling pathways were identified by comparing the host-plant compatible and incompatible interactions. The genes identified from this experiment could be useful to understand the host-plant resistance and design novel strategies to manage blast disease in pearl millet.
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Affiliation(s)
- Shweta Singh
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Telangana, India
- Professor Jayashankar Telangana State Agricultural University (PJTSAU), Hyderabad, Telangana, India
- ICAR-Indian Institute of Sugarcane Research, Lucknow, Uttar Pradesh, India
| | - Rajan Sharma
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Telangana, India
| | | | - Spurthi N. Nayak
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Telangana, India
- Department of Biotechnology, University of Agricultural Sciences, Dharwad, Karnataka, India
| | - Bheemavarapu Pushpavathi
- Professor Jayashankar Telangana State Agricultural University (PJTSAU), Hyderabad, Telangana, India
| | - Aamir W. Khan
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Telangana, India
| | - Rakesh K. Srivastava
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Telangana, India
| | - Rajeev K. Varshney
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Telangana, India
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Singh M, Nara U. Genetic insights in pearl millet breeding in the genomic era: challenges and prospects. PLANT BIOTECHNOLOGY REPORTS 2022; 17:15-37. [PMID: 35692233 PMCID: PMC9169599 DOI: 10.1007/s11816-022-00767-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 04/30/2022] [Accepted: 05/17/2022] [Indexed: 05/28/2023]
Abstract
Pearl millet, a vital staple food and an important cereal, is emerging as crop having various end-uses as feed, food as well as fodder. Advancement in high-throughput sequencing technology has boosted up pearl millet genomic research in past few years. The available draft genome of pearl millet providing an insight into the advancement of several breeding lines. Comparative and functional genomics have untangled several loci and genes regulating adaptive and agronomic traits in pearl millet. Additionally, the knowledge achieved has far away from being applicable in real breeding practices. We believe that the best path ahead is to adopt genome-based approaches for tailored designing of pearl millet as multi-functional crop with outstanding agronomic traits for various end uses. Presently review highlight several novel concepts and techniques in crop breeding, and summarize the recent advances in pearl millet genomic research, peculiarly genome-wide association dissections of several novel alleles and genes for agronomically important traits.
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Affiliation(s)
- Mandeep Singh
- Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, Punjab 141004 India
| | - Usha Nara
- Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, Punjab 141004 India
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Alzahrani NS, Alshammari GM, El-Ansary A, Yagoub AEA, Amina M, Saleh A, Yahya MA. Anti-Hyperlipidemia, Hypoglycemic, and Hepatoprotective Impacts of Pearl Millet ( Pennisetum glaucum L.) Grains and Their Ethanol Extract on Rats Fed a High-Fat Diet. Nutrients 2022; 14:nu14091791. [PMID: 35565759 PMCID: PMC9105973 DOI: 10.3390/nu14091791] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 04/18/2022] [Accepted: 04/22/2022] [Indexed: 12/17/2022] Open
Abstract
This study tested the anti-hyperlipidemic, hypoglycemic, hepatoprotective, and anti-inflammatory effects of whole pearl millet grain powder (MPG) and its ethanol extract (MPGethaolE) in obese rats fed a high-fat diet. The rats were divided into eight groups based on the treatments they received: control, high fat diet (HFD), HFD + MGE (25 mg/Kg), HFD + MPGethaolE (50 mg/Kg), HFD + MPGethaolE (100 mg/Kg), HFD + MPG (10%), HFD + MPG (20%), and HFD + MPG (30%). The final body weight, visceral, epididymal fat pads, and the liver weight were significantly decreased, in a dose-dependent manner, in HFD fed rats that were co-administered either the MPG powder or MPGethaolE. In the same line, serum levels of triglycerides (TGs), cholesterol (CHOL), and low-density lipoprotein-cholesterol (LDL-c), as well as fasting glucose, insulin, HOMA-IR, and serum levels of lipopolysaccharides (LPS), interleukine-6 (IL-6), interleukine-10 (IL-10), C-reactive protein (CRP), tumor necrosis factor (TNF-α), and adiponectin were progressively decreased while serum levels of high-density lipoproteins (HDL-c) were significantly increased when increasing the doses of both treatments. In conclusion, both the raw powder and ethanolic extract of MP have a comparative dose-dependent anti-obesity, hypoglycemic, hypolipidemic, anti-inflammatory, and anti-steatotic in HFD-fed rats.
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Affiliation(s)
- Nadiah S. Alzahrani
- Department of Food Science and Nutrition, College of Food Science and Agriculture, King Saud University, Riyadh 11451, Saudi Arabia; (N.S.A.); (A.E.A.Y.); (A.S.); (M.A.Y.)
| | - Ghedeir M. Alshammari
- Department of Food Science and Nutrition, College of Food Science and Agriculture, King Saud University, Riyadh 11451, Saudi Arabia; (N.S.A.); (A.E.A.Y.); (A.S.); (M.A.Y.)
- Correspondence:
| | - Afaf El-Ansary
- Central Research Laboratory, Female Campus, King Saud University, Riyadh 11472, Saudi Arabia;
| | - Abu ElGasim A. Yagoub
- Department of Food Science and Nutrition, College of Food Science and Agriculture, King Saud University, Riyadh 11451, Saudi Arabia; (N.S.A.); (A.E.A.Y.); (A.S.); (M.A.Y.)
| | - Musarat Amina
- Department of Pharmacognosy, Pharmacy College, King Saud University, Riyadh 11451, Saudi Arabia;
| | - Ali Saleh
- Department of Food Science and Nutrition, College of Food Science and Agriculture, King Saud University, Riyadh 11451, Saudi Arabia; (N.S.A.); (A.E.A.Y.); (A.S.); (M.A.Y.)
| | - Mohammed Abdo Yahya
- Department of Food Science and Nutrition, College of Food Science and Agriculture, King Saud University, Riyadh 11451, Saudi Arabia; (N.S.A.); (A.E.A.Y.); (A.S.); (M.A.Y.)
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Srivastava RK, Yadav OP, Kaliamoorthy S, Gupta SK, Serba DD, Choudhary S, Govindaraj M, Kholová J, Murugesan T, Satyavathi CT, Gumma MK, Singh RB, Bollam S, Gupta R, Varshney RK. Breeding Drought-Tolerant Pearl Millet Using Conventional and Genomic Approaches: Achievements and Prospects. FRONTIERS IN PLANT SCIENCE 2022; 13:781524. [PMID: 35463391 PMCID: PMC9021881 DOI: 10.3389/fpls.2022.781524] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Accepted: 02/11/2022] [Indexed: 06/03/2023]
Abstract
Pearl millet [Pennisetum glaucum (L.) R. Br.] is a C4 crop cultivated for its grain and stover in crop-livestock-based rain-fed farming systems of tropics and subtropics in the Indian subcontinent and sub-Saharan Africa. The intensity of drought is predicted to further exacerbate because of looming climate change, necessitating greater focus on pearl millet breeding for drought tolerance. The nature of drought in different target populations of pearl millet-growing environments (TPEs) is highly variable in its timing, intensity, and duration. Pearl millet response to drought in various growth stages has been studied comprehensively. Dissection of drought tolerance physiology and phenology has helped in understanding the yield formation process under drought conditions. The overall understanding of TPEs and differential sensitivity of various growth stages to water stress helped to identify target traits for manipulation through breeding for drought tolerance. Recent advancement in high-throughput phenotyping platforms has made it more realistic to screen large populations/germplasm for drought-adaptive traits. The role of adapted germplasm has been emphasized for drought breeding, as the measured performance under drought stress is largely an outcome of adaptation to stress environments. Hybridization of adapted landraces with selected elite genetic material has been stated to amalgamate adaptation and productivity. Substantial progress has been made in the development of genomic resources that have been used to explore genetic diversity, linkage mapping (QTLs), marker-trait association (MTA), and genomic selection (GS) in pearl millet. High-throughput genotyping (HTPG) platforms are now available at a low cost, offering enormous opportunities to apply markers assisted selection (MAS) in conventional breeding programs targeting drought tolerance. Next-generation sequencing (NGS) technology, micro-environmental modeling, and pearl millet whole genome re-sequence information covering circa 1,000 wild and cultivated accessions have helped to greater understand germplasm, genomes, candidate genes, and markers. Their application in molecular breeding would lead to the development of high-yielding and drought-tolerant pearl millet cultivars. This review examines how the strategic use of genetic resources, modern genomics, molecular biology, and shuttle breeding can further enhance the development and delivery of drought-tolerant cultivars.
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Affiliation(s)
- Rakesh K. Srivastava
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, India
| | - O. P. Yadav
- Indian Council of Agricultural Research-Central Arid Zone Research Institute, Jodhpur, India
| | - Sivasakthi Kaliamoorthy
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, India
| | - S. K. Gupta
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, India
| | - Desalegn D. Serba
- United States Department of Agriculture-Agriculture Research Service (ARS), U.S. Arid Land Agricultural Research Center, Maricopa, AZ, United States
| | - Sunita Choudhary
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, India
| | - Mahalingam Govindaraj
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, India
| | - Jana Kholová
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, India
| | - Tharanya Murugesan
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, India
| | - C. Tara Satyavathi
- Indian Council of Agricultural Research – All India Coordinated Research Project on Pearl Millet, Jodhpur, India
| | - Murali Krishna Gumma
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, India
| | - Ram B. Singh
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, India
| | - Srikanth Bollam
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, India
| | - Rajeev Gupta
- United States Department of Agriculture-Agriculture Research Service (ARS), Edward T. Schafer Agricultural Research Center, Fargo, ND, United States
| | - Rajeev K. Varshney
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, India
- State Agricultural Biotechnology Centre, Centre for Crop & Food Innovation, Food Futures Institute, Murdoch University, Murdoch, WA, Australia
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Awan SA, Khan I, Tariq R, Rizwan M, Wang X, Zhang X, Huang L. Genome-Wide Expression and Physiological Profiling of Pearl Millet Genotype Reveal the Biological Pathways and Various Gene Clusters Underlying Salt Resistance. FRONTIERS IN PLANT SCIENCE 2022; 13:849618. [PMID: 35419021 PMCID: PMC8996197 DOI: 10.3389/fpls.2022.849618] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Accepted: 02/07/2022] [Indexed: 05/04/2023]
Abstract
Pearl millet (Pennisetum glaucum L.) is a vital staple food and an important cereal crop used as food, feed, and forage. It can withstand heat and drought due to the presence of some unique genes; however, the mechanism of salt stress has been missing in pearl millet until now. Therefore, we conducted a comparative transcriptome profiling to reveal the differentially expressed transcripts (DETs) associated with salt stress in pearl millet at different time points, such as 1, 3, and 7 h, of salt treatment. The physiological results suggested that salt stress significantly increased proline, malondialdehyde (MDA) content, and hydrogen peroxide (H2O2) in pearl millet at 1, 3, and 7 h of salt treatment. In addition, pearl millet plants regulated the activities of superoxide dismutase, catalase, and peroxidase to lessen the impact of salinity. The transcriptomic results depicted that salt stress upregulated and downregulated the expression of various transcripts involved in different metabolic functions. At 1 and 7 h of salt treatment, most of the transcripts were highly upregulated as compared to the 3 h treatment. Moreover, among commonly enriched Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways, the mitogen-activated protein kinase (MAPK) signaling pathway and peroxisome pathway were significantly enriched. The DETs related to hormone signaling (auxins, ethylene, gibberellin, and abscisic acid), kinases, protein modifications, and degradation were also identified, depicting the possible role of hormones and kinases to enhance plant tolerance against salt stress. Furthermore, the transcription factors, such as ethylene-responsive element binding factors (ERF), basic helix-loop-helix (bHLH), HMG box-containing protein (HBP), MADS, myeloblastosis (MYB), and WRKY, were predicted to significantly regulate different transcripts involved in salt stress responses at three different time points. Overall, this study will provide new insights to better understand the salt stress regulation mechanisms in pearl millet to improve its resistance against salinity and to identify new transcripts that control these mechanisms in other cereals.
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Affiliation(s)
- Samrah Afzal Awan
- College of Grassland Science and Technology, Sichuan Agricultural University, Chengdu, China
| | - Imran Khan
- College of Grassland Science and Technology, Sichuan Agricultural University, Chengdu, China
| | - Rezwan Tariq
- Department of Plant Protection, Akdeniz University, Antalya, Turkey
| | - Muhammad Rizwan
- Department of Environmental Sciences and Engineering, Government College University Faisalabad, Faisalabad, Pakistan
| | - Xiaoshan Wang
- College of Grassland Science and Technology, Sichuan Agricultural University, Chengdu, China
| | - Xinquan Zhang
- College of Grassland Science and Technology, Sichuan Agricultural University, Chengdu, China
| | - Linkai Huang
- College of Grassland Science and Technology, Sichuan Agricultural University, Chengdu, China
- *Correspondence: Linkai Huang,
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Srivastava RK, Satyavathi CT, Mahendrakar MD, Singh RB, Kumar S, Govindaraj M, Ghazi IA. Addressing Iron and Zinc Micronutrient Malnutrition Through Nutrigenomics in Pearl Millet: Advances and Prospects. Front Genet 2021; 12:723472. [PMID: 34868202 PMCID: PMC8637740 DOI: 10.3389/fgene.2021.723472] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Accepted: 09/23/2021] [Indexed: 11/23/2022] Open
Abstract
Iron (Fe) and zinc (Zn) micronutrient deficiencies are significant health concerns, particularly among the underprivileged and resource-poor people in the semi-arid tropics globally. Pearl millet is regarded as a climate-smart crop with low water and energy footprints. It thrives well under adverse agro-ecologies such as high temperatures and limited rainfall. Pearl millet is regarded as a nutri-cereal owing to health-promoting traits such as high grain Fe and Zn content, metabolizable energy, high antioxidant and polyphenols, high proportion of slowly digestible starches, dietary fibers, and favorable essential amino acid profile compared to many cereals. Higher genetic variability for grain Fe and Zn content has facilitated considerable progress in mapping and mining QTLs, alleles and genes underlying micronutrient metabolism. This has been made possible by developing efficient genetic and genomic resources in pearl millet over the last decade. These include genetic stocks such as bi-parental RIL mapping populations, association mapping panels, chromosome segment substitution lines (CSSLs) and TILLING populations. On the genomics side, considerable progress has been made in generating genomic markers, such as SSR marker repository development. This was followed by the development of a next-generation sequencing-based genome-wide SNP repository. The circa 1,000 genomes re-sequencing project played a significant role. A high-quality reference genome was made available by re-sequencing of world diversity panel, mapping population parents and hybrid parental lines. This mini-review attempts to provide information on the current developments on mapping Fe and Zn content in pearl millet and future outlook.
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Affiliation(s)
- Rakesh K Srivastava
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, India
| | - C Tara Satyavathi
- All India Coordinated Research Project on Pearl Millet (Indian Council of Agricultural Research), Jodhpur, India
| | - Mahesh D Mahendrakar
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, India
| | - Ram B Singh
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, India
| | - Sushil Kumar
- Department of Agricultural Biotechnology, Anand Agricultural University (AAU), Anand, India
| | - Mahalingam Govindaraj
- Alliance of Bioversity International and the International Center for Tropical Agriculture (CIAT), Cali, Colombia
| | - Irfan A Ghazi
- Department of Plant Sciences, School of Life Sciences, University of Hyderabad, Hyderabad, India
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Satyavathi CT, Ambawat S, Khandelwal V, Srivastava RK. Pearl Millet: A Climate-Resilient Nutricereal for Mitigating Hidden Hunger and Provide Nutritional Security. FRONTIERS IN PLANT SCIENCE 2021; 12:659938. [PMID: 34589092 PMCID: PMC8475763 DOI: 10.3389/fpls.2021.659938] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 08/03/2021] [Indexed: 06/03/2023]
Abstract
Pearl millet [Pennisetum glaucum (L.) R. Br.] is the sixth most important cereal crop after rice, wheat, maize, barley and sorghum. It is widely grown on 30 million ha in the arid and semi-arid tropical regions of Asia and Africa, accounting for almost half of the global millet production. Climate change affects crop production by directly influencing biophysical factors such as plant and animal growth along with the various areas associated with food processing and distribution. Assessment of the effects of global climate changes on agriculture can be helpful to anticipate and adapt farming to maximize the agricultural production more effectively. Pearl millet being a climate-resilient crop is important to minimize the adverse effects of climate change and has the potential to increase income and food security of farming communities in arid regions. Pearl millet has a deep root system and can survive in a wide range of ecological conditions under water scarcity. It has high photosynthetic efficiency with an excellent productivity and growth in low nutrient soil conditions and is less reliant on chemical fertilizers. These attributes have made it a crop of choice for cultivation in arid and semi-arid regions of the world; however, fewer efforts have been made to study the climate-resilient features of pearl millet in comparison to the other major cereals. Several hybrids and varieties of pearl millet were developed during the past 50 years in India by both the public and private sectors. Pearl millet is also nutritionally superior and rich in micronutrients such as iron and zinc and can mitigate malnutrition and hidden hunger. Inclusion of minimum standards for micronutrients-grain iron and zinc content in the cultivar release policy-is the first of its kind step taken in pearl millet anywhere in the world, which can lead toward enhanced food and nutritional security. The availability of high-quality whole-genome sequencing and re-sequencing information of several lines may aid genomic dissection of stress tolerance and provide a good opportunity to further exploit the nutritional and climate-resilient attributes of pearl millet. Hence, more efforts should be put into its genetic enhancement and improvement in inheritance to exploit it in a better way. Thus, pearl millet is the next-generation crop holding the potential of nutritional richness and the climate resilience and efforts must be targeted to develop nutritionally dense hybrids/varieties tolerant to drought using different omics approaches.
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Affiliation(s)
- C. Tara Satyavathi
- Indian Council of Agricultural Research - All India Coordinated Research Project on Pearl Millet, Jodhpur, India
| | - Supriya Ambawat
- Indian Council of Agricultural Research - All India Coordinated Research Project on Pearl Millet, Jodhpur, India
| | - Vikas Khandelwal
- Indian Council of Agricultural Research - All India Coordinated Research Project on Pearl Millet, Jodhpur, India
| | - Rakesh K. Srivastava
- Department of Molecular Breeding (Genomics Trait Discovery), International Crops Research Institute for Semi-arid Tropics, Patancheru, India
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Heterotic pools in African and Asian origin populations of pearl millet [Pennisetum glaucum (L.) R. Br.]. Sci Rep 2021; 11:12197. [PMID: 34108516 PMCID: PMC8190140 DOI: 10.1038/s41598-021-91568-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Accepted: 05/28/2021] [Indexed: 11/26/2022] Open
Abstract
Forty-five African or Asian origin pearl millet populations bred either in Africa or Asia were investigated to generate information on heterotic pools. They were clustered into seven groups (G1 to G7) when genotyped, using 29 highly polymorphic SSRs. Fourteen parental populations representing these seven marker-based groups were crossed in diallel mating design to generate 91 population hybrids. The hybrids evaluated at three locations in India showed mean panmictic mid-parent heterosis (PMPH) and better-parent heterosis (PBPH) for grain yield ranging from − 21.7 to 62.08% and − 32.51 to 42.99%, respectively. Higher grain yield and heterosis were observed in G2 × G6 (2462 kg ha−1, 43.2%) and G2 × G5 (2455 kg ha−1, 42.8%) marker group crosses compared to the most popular Indian open-pollinated variety (OPV) ICTP 8203. Two heterotic groups, Pearl millet Population Heterotic Pool-1 (PMPHP-1) comprising G2 populations and Pearl millet Population Heterotic Pool-2 (PMPHP-2) comprising G5 and G6 populations, were identified based on hybrid performance, heterosis and combining ability among marker group crosses. Population hybrids from two heterotic groups, PMPHP-1 × PMPHP-2 demonstrated PMPH of 14.75% and PBPH of 6.8%. Populations of PMPHP-1 had linkages with either African or Asian origin populations, whereas PMPHP-2 composed of populations originating in Africa and later bred for Asian environments. Results indicated that parental populations from the two opposite heterotic groups can be used as base populations to derive superior inbred lines to develop high yielding hybrids/cultivars.
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Singhal T, Satyavathi CT, Singh SP, Kumar A, Sankar SM, Bhardwaj C, Mallik M, Bhat J, Anuradha N, Singh N. Multi-Environment Quantitative Trait Loci Mapping for Grain Iron and Zinc Content Using Bi-parental Recombinant Inbred Line Mapping Population in Pearl Millet. FRONTIERS IN PLANT SCIENCE 2021; 12:659789. [PMID: 34093617 PMCID: PMC8169987 DOI: 10.3389/fpls.2021.659789] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 04/06/2021] [Indexed: 05/24/2023]
Abstract
Pearl millet is a climate-resilient, nutritious crop with low input requirements that could provide economic returns in marginal agro-ecologies. In this study, we report quantitative trait loci (QTLs) for iron (Fe) and zinc (Zn) content from three distinct production environments. We generated a genetic linkage map using 210 F6 recombinant inbred line (RIL) population derived from the (PPMI 683 × PPMI 627) cross using genome-wide simple sequence repeats (SSRs). The molecular linkage map (seven linkage groups) of 151 loci was 3,273.1 cM length (Kosambi). The content of grain Fe in the RIL population ranged between 36 and 114 mg/Kg, and that of Zn from 20 to 106 mg/Kg across the 3 years (2014-2016) at over the three locations (Delhi, Dharwad, and Jodhpur). QTL analysis revealed a total of 22 QTLs for grain Fe and Zn, of which 14 were for Fe and eight were for Zn on three consecutive years at all locations. The observed phenotypic variance (R 2) explained by different QTLs for grain Fe and Zn content ranged from 2.85 (QGFe.E3.2014-2016_Q3) to 19.66% (QGFe.E1.2014-2016_Q3) and from 2.93 (QGZn.E3.2014-2016_Q3) to 25. 95% (QGZn.E1.2014-2016_Q1), respectively. Two constitutive expressing QTLs for both Fe and Zn co-mapped in this population, one on LG 2 and second one on LG 3. Inside the QTLs candidate genes such as Ferritin gene, Al3+ Transporter, K+ Transporters, Zn2+ transporters and Mg2+ transporters were identified using bioinformatics approaches. The identified QTLs and candidate genes could be useful in pearl millet population improvement programs, seed, restorer parents, and marker-assisted selection programs.
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Affiliation(s)
- Tripti Singhal
- ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - C. Tara Satyavathi
- ICAR-All India Coordinated Research Project on Pearl Millet, Jodhpur, India
| | - S. P. Singh
- ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Aruna Kumar
- Amity Institute of Biotechnology, Amity University, Noida, India
| | | | - C. Bhardwaj
- ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - M. Mallik
- ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Jayant Bhat
- Regional Research Centre, ICAR-Indian Agricultural Research Institute, Dharwad, India
| | - N. Anuradha
- Acharya N. G. Ranga Agricultural University, Vizianagaram, India
| | - Nirupma Singh
- ICAR-Indian Agricultural Research Institute, New Delhi, India
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11
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Shivhare R, Asif MH, Lata C. Comparative transcriptome analysis reveals the genes and pathways involved in terminal drought tolerance in pearl millet. PLANT MOLECULAR BIOLOGY 2020; 103:639-652. [PMID: 32430635 DOI: 10.1007/s11103-020-01015-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Accepted: 05/11/2020] [Indexed: 05/09/2023]
Affiliation(s)
- Radha Shivhare
- CSIR- National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226001, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Mehar H Asif
- CSIR- National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226001, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Charu Lata
- CSIR- National Botanical Research Institute, Rana Pratap Marg, Lucknow, 226001, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
- CSIR-National Institute of Science Communication and Information Resources, 14 Satsang Vihar Marg, New Delhi, 110067, India.
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12
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K. Srivastava R, Bollam S, Pujarula V, Pusuluri M, Singh RB, Potupureddi G, Gupta R. Exploitation of Heterosis in Pearl Millet: A Review. PLANTS (BASEL, SWITZERLAND) 2020; 9:E807. [PMID: 32605134 PMCID: PMC7412370 DOI: 10.3390/plants9070807] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 06/23/2020] [Accepted: 06/23/2020] [Indexed: 01/06/2023]
Abstract
The phenomenon of heterosis has fascinated plant breeders ever since it was first described by Charles Darwin in 1876 in the vegetable kingdom and later elaborated by George H Shull and Edward M East in maize during 1908. Heterosis is the phenotypic and functional superiority manifested in the F1 crosses over the parents. Various classical complementation mechanisms gave way to the study of the underlying potential cellular and molecular mechanisms responsible for heterosis. In cereals, such as maize, heterosis has been exploited very well, with the development of many single-cross hybrids that revolutionized the yield and productivity enhancements. Pearl millet (Pennisetum glaucum (L.) R. Br.) is one of the important cereal crops with nutritious grains and lower water and energy footprints in addition to the capability of growing in some of the harshest and most marginal environments of the world. In this highly cross-pollinating crop, heterosis was exploited by the development of a commercially viable cytoplasmic male-sterility (CMS) system involving a three-lines breeding system (A-, B- and R-lines). The first set of male-sterile lines, i.e., Tift 23A and Tift18A, were developed in the early 1960s in Tifton, Georgia, USA. These provided a breakthrough in the development of hybrids worldwide, e.g., Tift 23A was extensively used by Punjab Agricultural University (PAU), Ludhiana, India, for the development of the first single-cross pearl millet hybrid, named Hybrid Bajra 1 (HB 1), in 1965. Over the past five decades, the pearl millet community has shown tremendous improvement in terms of cytoplasmic and nuclear diversification of the hybrid parental lines, which led to a progressive increase in the yield and adaptability of the hybrids that were developed, resulting in significant genetic gains. Lately, the whole genome sequencing of Tift 23D2B1 and re-sequencing of circa 1000 genomes by a consortium led by the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) has been a significant milestone in the development of cutting-edge genetic and genomic resources in pearl millet. Recently, the application of genomics and molecular technologies has provided better insights into genetic architecture and patterns of heterotic gene pools. Development of whole-genome prediction models incorporating heterotic gene pool models, mapped traits and markers have the potential to take heterosis breeding to a new level in pearl millet. This review discusses advances and prospects in various fronts of heterosis for pearl millet.
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Affiliation(s)
- Rakesh K. Srivastava
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad TS 502324, India; (S.B.); (V.P.); (M.P.); (R.B.S.); (G.P.)
| | | | | | | | | | | | - Rajeev Gupta
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad TS 502324, India; (S.B.); (V.P.); (M.P.); (R.B.S.); (G.P.)
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De novo assembly and comparative transcriptome analysis of contrasting pearl millet (Pennisetum glaucum L.) genotypes under terminal drought stress using illumina sequencing. THE NUCLEUS 2020. [DOI: 10.1007/s13237-020-00324-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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14
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Srivastava RK, Singh RB, Pujarula VL, Bollam S, Pusuluri M, Chellapilla TS, Yadav RS, Gupta R. Genome-Wide Association Studies and Genomic Selection in Pearl Millet: Advances and Prospects. Front Genet 2020; 10:1389. [PMID: 32180790 PMCID: PMC7059752 DOI: 10.3389/fgene.2019.01389] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Accepted: 12/19/2019] [Indexed: 11/13/2022] Open
Abstract
Pearl millet is a climate-resilient, drought-tolerant crop capable of growing in marginal environments of arid and semi-arid regions globally. Pearl millet is a staple food for more than 90 million people living in poverty and can address the triple burden of malnutrition substantially. It remained a neglected crop until the turn of the 21st century, and much emphasis has been placed since then on the development of various genetic and genomic resources for whole-genome scan studies, such as the genome-wide association studies (GWAS) and genomic selection (GS). This was facilitated by the advent of sequencing-based genotyping, such as genotyping-by-sequencing (GBS), RAD-sequencing, and whole-genome re-sequencing (WGRS) in pearl millet. To carry out GWAS and GS, a world association mapping panel called the Pearl Millet inbred Germplasm Association Panel (PMiGAP) was developed at ICRISAT in partnership with Aberystwyth University. This panel consisted of germplasm lines, landraces, and breeding lines from 27 countries and was re-sequenced using the WGRS approach. It has a repository of circa 29 million genome-wide SNPs. PMiGAP has been used to map traits related to drought tolerance, grain Fe and Zn content, nitrogen use efficiency, components of endosperm starch, grain yield, etc. Genomic selection in pearl millet was jump-started recently by WGRS, RAD, and tGBS (tunable genotyping-by-sequencing) approaches for the PMiGAP and hybrid parental lines. Using multi-environment phenotyping of various training populations, initial attempts have been made to develop genomic selection models. This mini review discusses advances and prospects in GWAS and GS for pearl millet.
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Affiliation(s)
- Rakesh K Srivastava
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, India
| | - Ram B Singh
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, India
| | - Vijaya Lakshmi Pujarula
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, India
| | - Srikanth Bollam
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, India
| | - Madhu Pusuluri
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, India
| | - Tara Satyavathi Chellapilla
- All India Coordinated Research Project on Pearl Millet (AICRP-PM), Indian Council of Agricultural Research (ICAR), Jodhpur, India
| | - Rattan S Yadav
- Institute of Biological, Environmental & Rural Sciences (IBERS), Aberystwyth University, Gogerddan, United Kingdom
| | - Rajeev Gupta
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, India
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Rocha JRDASDC, Marçal TDS, Salvador FV, da Silva AC, Carneiro PCS, de Resende MDV, Carneiro JDC, Azevedo ALS, Pereira JF, Machado JC. Unraveling candidate genes underlying biomass digestibility in elephant grass (Cenchrus purpureus). BMC PLANT BIOLOGY 2019; 19:548. [PMID: 31822283 PMCID: PMC6905061 DOI: 10.1186/s12870-019-2180-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 12/01/2019] [Indexed: 05/08/2023]
Abstract
BACKGROUND Elephant grass [Cenchrus purpureus (Schumach.) Morrone] is used for bioenergy and animal feed. In order to identify candidate genes that could be exploited for marker-assisted selection in elephant grass, this study aimed to investigate changes in predictive accuracy using genomic relationship information and simple sequence repeats for eight traits (height, green biomass, dry biomass, acid and neutral detergent fiber, lignin content, biomass digestibility, and dry matter concentration) linked to bioenergetics and animal feeding. RESULTS We used single-step, genome-based best linear unbiased prediction and genome association methods to investigate changes in predictive accuracy and find candidate genes using genomic relationship information. Genetic variability (p < 0.05) was detected for most of the traits evaluated. In general, the overall means for the traits varied widely over the cuttings, which was corroborated by a significant genotype by cutting interaction. Knowing the genomic relationships increased the predictive accuracy of the biomass quality traits. We found that one marker (M28_161) was significantly associated with high values of biomass digestibility. The marker had moderate linkage disequilibrium with another marker (M35_202) that, in general, was detected in genotypes with low values of biomass digestibility. In silico analysis revealed that both markers have orthologous regions in other C4 grasses such as Setaria viridis, Panicum hallii, and Panicum virgatum, and these regions are located close to candidate genes involved in the biosynthesis of cell wall molecules (xyloglucan and lignin), which support their association with biomass digestibility. CONCLUSIONS The markers and candidate genes identified here are useful for breeding programs aimed at changing biomass digestibility in elephant grass. These markers can be used in marker-assisted selection to grow elephant grass cultivars for different uses, e.g., bioenergy production, bio-based products, co-products, bioactive compounds, and animal feed.
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Basava RK, Hash CT, Mahendrakar MD, Kishor P. B. K, Satyavathi CT, Kumar S, Singh RB, Yadav RS, Gupta R, Srivastava RK. Discerning combining ability loci for divergent environments using chromosome segment substitution lines (CSSLs) in pearl millet. PLoS One 2019; 14:e0218916. [PMID: 31461465 PMCID: PMC6713397 DOI: 10.1371/journal.pone.0218916] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 06/13/2019] [Indexed: 11/18/2022] Open
Abstract
Pearl millet is an important crop for arid and semi-arid regions of the world. Genomic regions associated with combining ability for yield-related traits under irrigated and drought conditions are useful in heterosis breeding programs. Chromosome segment substitution lines (CSSLs) are excellent genetic resources for precise QTL mapping and identifying naturally occurring favorable alleles. In the present study, testcross hybrid populations of 85 CSSLs were evaluated for 15 grain and stover yield-related traits for summer and wet seasons under irrigated control (CN) and moisture stress (MS) conditions. General combining ability (GCA) and specific combining ability (SCA) effects of all these traits were estimated and significant marker loci linked to GCA and SCA of the traits were identified. Heritability of the traits ranged from 53-94% in CN and 63-94% in MS. A total of 40 significant GCA loci and 36 significant SCA loci were identified for 14 different traits. Five QTLs (flowering time, panicle number and panicle yield linked to Xpsmp716 on LG4, flowering time and grain number per panicle with Xpsmp2076 on LG4) simultaneously controlled both GCA and SCA, demonstrating their unique genetic basis and usefulness for hybrid breeding programs. This study for the first time demonstrated the potential of a set of CSSLs for trait mapping in pearl millet. The novel combining ability loci linked with GCA and SCA values of the traits identified in this study may be useful in pearl millet hybrid and population improvement programs using marker-assisted selection (MAS).
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Affiliation(s)
- Ramana Kumari Basava
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad, Telangana State, India
| | - Charles Thomas Hash
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad, Telangana State, India
| | - Mahesh D. Mahendrakar
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad, Telangana State, India
| | | | - C. Tara Satyavathi
- All India Coordinated Research Project on Pearl Millet (AICRP-PM), Indian Council of Agricultural Research (ICAR), Mandor, Jodhpur, Rajasthan, India
| | - Sushil Kumar
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad, Telangana State, India
- Anand Agricultural University, Anand, Gujarat, India
| | - R. B. Singh
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad, Telangana State, India
| | - Rattan S. Yadav
- Institute of Biological, Environmental & Rural Sciences (IBERS), Aberystwyth University, Gogerddan, Wales, United Kingdom
| | - Rajeev Gupta
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad, Telangana State, India
| | - Rakesh K. Srivastava
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Hyderabad, Telangana State, India
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17
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Singh S, Gupta SK. Formation of heterotic pools and understanding relationship between molecular divergence and heterosis in pearl millet [Pennisetum glaucum (L.) R. Br.]. PLoS One 2019; 14:e0207463. [PMID: 31063504 PMCID: PMC6504090 DOI: 10.1371/journal.pone.0207463] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2018] [Accepted: 04/21/2019] [Indexed: 11/30/2022] Open
Abstract
The present investigation was made to generate information on the heterotic pools amongst pearl millet hybrid parents. A set of 17 representative parents was selected from a diverse set of 147 hybrid parents using SSR based genetic distance (GD) and clustering pattern; 136 hybrids were developed in diallel fashion and evaluated at two locations in India. Moderate positive significant correlation (r = 0.37, p<0.01) and (r = 0.33, p<0.01) was found between GD and mid-parent heterosis (MPH) and better-parent heterosis (BPH), respectively, for grain yield for all the hybrids. Higher correlation between genetically closer individuals was observed for grain yield heterosis when the parents of B- and R- crosses had lesser genetic distance (<0.68 GD) in comparison to those parental combinations having GD higher than 0.68, indicating that the GD based predictions for grain yield are better when the parents are genetically related than when they are genetically diverse. In this study, all the pearl millet hybrid parents seems to exist in two broad-based heterotic pools; one each represented by seed and restorer parents as B × R hybrids showed highest mean heterosis for grain yield than either of B × B or R × R crosses. Further, four heterotic pools have been identified in this diverse set of hybrid parents of pearl millet, two each for seed parents (HPB1 and HPB2) and for restorer parents (HPR3 and HPR4). Among these, HPB1 × HPR3 was identified having the highest heterotic level, and could be further used to develop higher yielding pearl millet hybrids.
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Affiliation(s)
- Satbeer Singh
- International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Telangana, India
- Department of Genetics and Plant Breeding, Chaudhary Charan Singh Haryana Agricultural University, Hisar, India
| | - Shashi Kumar Gupta
- International Crops Research Institute for the Semi-Arid Tropics, Patancheru, Telangana, India
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18
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Taunk J, Rani A, Yadav NR, Vartyadav D, Yadav RC, Raj K, Kumar R, Yadav HP. Molecular breeding of ameliorating commercial pearl millet hybrid for downy mildew resistance. J Genet 2018; 97:1241-1251. [PMID: 30555073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Downy mildew (DM) caused by Sclerospora graminicola is the most calamitous disease of pearl millet. Therefore, for introgression of DM resistance (DMR) in HHB 197 (MH-1302), an elite pearl millet hybrid, a marker-assisted breeding was undertaken by targeting three DMR loci on linkage groups (LGs) 1, 2 and 4. Breeding programme was initiated by crossing HBL 11 (DM susceptible), male parent of HHB 197 hybrid with ICMP 451 (DM-resistant) to produce true F1 plants. By conducting three rounds of backcrossing and selection, BC3F1 lines were generated. Foreground selection was employed using six polymorphic simple sequence repeat (SSR) markers of the 18 total selected markers. Four of these markers were linked to LG 1, five to LG 2 and nine to LG 4. Background selection was performed in BC3F1 generation using 33 polymorphic SSR markers of a total of 56 evenly spread SSR markers in the pearl millet genome to check recovery of recurrent parent genome. On the basis of genotypic selection (foreground as well as background) using selected SSR markers, agronomic performance in field and DM screening in greenhouse; 10 improved HBL 11 lines were selected and crossed with ICMA 97111 to produce DM-resistant HHB 197 hybrid versions. Six putatively improved HHB 197 hybrids were successfully tested in first year trials at Hisar and Bawal locations of Haryana and two selected versions with higher yield and zero DM incidence will be further tested in multilocation trials.
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Affiliation(s)
- Jyoti Taunk
- Department of Molecular Biology, Biotechnology and Bioinformatics, Chaudhary Charan Singh Haryana Agricultural University, Hisar 125 004, India.
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Gupta SK, Nepolean T, Shaikh CG, Rai K, Hash CT, Das RR, Rathore A. Phenotypic and molecular diversity-based prediction of heterosis in pearl millet (Pennisetum glaucum L. (R.) Br.). ACTA ACUST UNITED AC 2018. [DOI: 10.1016/j.cj.2017.09.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Velmurugan J, Milbourne D, Connolly V, Heslop-Harrison JS, Anhalt UCM, Lynch MB, Barth S. An Immortalized Genetic Mapping Population for Perennial Ryegrass: A Resource for Phenotyping and Complex Trait Mapping. FRONTIERS IN PLANT SCIENCE 2018; 9:717. [PMID: 29904390 PMCID: PMC5991167 DOI: 10.3389/fpls.2018.00717] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Accepted: 05/11/2018] [Indexed: 06/08/2023]
Abstract
To address the lack of a truly portable, universal reference mapping population for perennial ryegrass, we have been developing a recombinant inbred line (RIL) mapping population of perennial ryegrass derived via single seed descent from a well-characterized F2 mapping population based on genetically distinct inbred parents in which the natural self-incompatibility (SI) system of perennial ryegrass has been overcome. We examined whether it is possible to create a genotyping by sequencing (GBS) based genetic linkage map in a small population of the F6 generation of this population. We used 41 F6 genotypes for GBS with PstI/MspI-based libraries. We successfully developed a genetic linkage map comprising 6074 SNP markers, placing a further 22080 presence and absence variation (PAV) markers on the map. We examined the resulting genetic map for general and RIL specific features. Overall segregation distortion levels were similar to those experienced in the F2 generation, but segregation distortion was reduced on linkage group 6 and increased on linkage group 7. Residual heterozygosity in the F6 generation was observed at a level of 5.4%. There was a high proportion of chromosomes (30%) exhibiting the intact haplotype of the original inbred parents of the F1 genotype from which the population is derived, pointing to a tendency for chromosomes to assort without recombining. This could affect the applicability of these lines and might make them more suitable for situations where repressed recombination is an advantage. Inter- and intra-chromosomal linkage disequilibrium (LD) analysis suggested that the map order was robust. We conclude that this RIL population, and subsequent F7 and F8 generations will be useful for genetic analysis and phenotyping of agronomic and biological important traits in perennial ryegrass.
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Affiliation(s)
- Janaki Velmurugan
- Crops Environment and Land Use Programme, Oak Park Research Centre, Teagasc – The Irish Agriculture and Food Development Authority, Carlow, Ireland
- School of Agriculture and Food Science, University College Dublin, Dublin, Ireland
| | - Dan Milbourne
- Crops Environment and Land Use Programme, Oak Park Research Centre, Teagasc – The Irish Agriculture and Food Development Authority, Carlow, Ireland
| | - Vincent Connolly
- Crops Environment and Land Use Programme, Oak Park Research Centre, Teagasc – The Irish Agriculture and Food Development Authority, Carlow, Ireland
| | - J. S. Heslop-Harrison
- Department of Genetics and Genome Biology, University of Leicester, Leicester, United Kingdom
| | - Ulrike C. M. Anhalt
- Crops Environment and Land Use Programme, Oak Park Research Centre, Teagasc – The Irish Agriculture and Food Development Authority, Carlow, Ireland
- Department of Genetics and Genome Biology, University of Leicester, Leicester, United Kingdom
| | - M. B. Lynch
- School of Agriculture and Food Science, University College Dublin, Dublin, Ireland
| | - Susanne Barth
- Crops Environment and Land Use Programme, Oak Park Research Centre, Teagasc – The Irish Agriculture and Food Development Authority, Carlow, Ireland
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Kumar S, Hash CT, Nepolean T, Mahendrakar MD, Satyavathi CT, Singh G, Rathore A, Yadav RS, Gupta R, Srivastava RK. Mapping Grain Iron and Zinc Content Quantitative Trait Loci in an Iniadi-Derived Immortal Population of Pearl Millet. Genes (Basel) 2018; 9:E248. [PMID: 29751669 PMCID: PMC5977188 DOI: 10.3390/genes9050248] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Revised: 04/23/2018] [Accepted: 05/01/2018] [Indexed: 11/27/2022] Open
Abstract
Pearl millet is a climate-resilient nutritious crop requiring low inputs and is capable of giving economic returns in marginal agro-ecologies. In this study, we report large-effect iron (Fe) and zinc (Zn) content quantitative trait loci (QTLs) using diversity array technology (DArT) and simple sequence repeats (SSRs) markers to generate a genetic linkage map using 317 recombinant inbred line (RIL) population derived from the (ICMS 8511-S1-17-2-1-1-B-P03 × AIMP 92901-S1-183-2-2-B-08) cross. The base map [seven linkage groups (LGs)] of 196 loci was 964.2 cM in length (Haldane). AIMP 92901-S1-183-2-2-B-08 is an Iniadi line with high grain Fe and Zn, tracing its origin to the Togolese Republic, West Africa. The content of grain Fe in the RIL population ranged between 20 and 131 ppm (parts per million), and that of Zn from 18 to 110 ppm. QTL analysis revealed a large number of QTLs for high grain iron (Fe) and zinc (Zn) content. A total of 19 QTLs for Fe and Zn were detected, of which 11 were for Fe and eight were for Zn. The portion of the observed phenotypic variance explained by different QTLs for grain Fe and Zn content varied from 9.0 to 31.9% (cumulative 74%) and from 9.4 to 30.4% (cumulative 65%), respectively. Three large-effect QTLs for both minerals were co-mapped in this population, one on LG1 and two on LG7. The favorable QTL alleles of both mineral micronutrients were contributed by the male parent (AIMP 92901-deriv-08). Three putative epistasis interactions were observed for Fe content, while a single digenic interaction was found for Zn content. The reported QTLs may be useful in marker-assisted selection (MAS) programs, in genomic selection (GS) breeding pipelines for seed and restorer parents, and in population improvement programs for pearl millet.
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Affiliation(s)
- Sushil Kumar
- Plant Biotechnology Centre, SK Rajasthan Agricultural University, Bikaner 334006, India.
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Telangana 502324, India.
- Centre of Excellence in Biotechnology, Anand Agricultural University, Anand, Gujarat 388110, India.
| | - Charles Tom Hash
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Niamey 8001, Niger.
| | | | - Mahesh D Mahendrakar
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Telangana 502324, India.
| | | | - Govind Singh
- Plant Biotechnology Centre, SK Rajasthan Agricultural University, Bikaner 334006, India.
| | - Abhishek Rathore
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Telangana 502324, India.
| | - Rattan S Yadav
- Crop Genetics, Genomics and Breeding Division, Aberystwyth University, Aberystwyth SY23, UK.
| | - Rajeev Gupta
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Telangana 502324, India.
| | - Rakesh K Srivastava
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Patancheru, Telangana 502324, India.
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Pandian S, Satish L, Rameshkumar R, Muthuramalingam P, Rency AS, Rathinapriya P, Ramesh M. Analysis of population structure and genetic diversity in an exotic germplasm collection of Eleusine coracana (L.) Gaertn. using genic-SSR markers. Gene 2018; 653:80-90. [DOI: 10.1016/j.gene.2018.02.018] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Revised: 01/22/2018] [Accepted: 02/07/2018] [Indexed: 11/30/2022]
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Hou L, Cui Y, Li X, Chen W, Zhang Z, Pang X, Li Y. Genetic Evaluation of Natural Populations of the Endangered Conifer Thuja koraiensis Using Microsatellite Markers by Restriction-Associated DNA Sequencing. Genes (Basel) 2018; 9:E218. [PMID: 29673217 PMCID: PMC5924560 DOI: 10.3390/genes9040218] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2018] [Revised: 04/09/2018] [Accepted: 04/13/2018] [Indexed: 11/16/2022] Open
Abstract
Thuja koraiensis Nakai is an endangered conifer of high economic and ecological value in Jilin Province, China. However, studies on its population structure and conservation genetics have been limited by the lack of genomic data. Here, 37,761 microsatellites (simple sequence repeat, SSR) were detected based on 875,792 de novo-assembled contigs using a restriction-associated DNA (RAD) approach. Among these SSRs, 300 were randomly selected to test for polymorphisms and 96 obtained loci were able to amplify a fragment of expected size. Twelve polymorphic SSR markers were developed to analyze the genetic diversity and population structure of three natural populations. High genetic diversity (mean NA = 5.481, HE = 0.548) and moderate population differentiation (pairwise Fst = 0.048–0.078, Nm = 2.940–4.958) were found in this species. Molecular variance analysis suggested that most of the variation (83%) existed within populations. Combining the results of STRUCTURE, principal coordinate, and neighbor-joining analysis, the 232 individuals were divided into three genetic clusters that generally correlated with their geographical distributions. Finally, appropriate conservation strategies were proposed to protect this species. This study provides genetic information for the natural resource conservation and utilization of T. koraiensis and will facilitate further studies of the evolution and phylogeography of the species.
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Affiliation(s)
- Lu Hou
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China.
| | - Yanhong Cui
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China.
| | - Xiang Li
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China.
| | - Wu Chen
- The Germplasm Bank of Wild Species, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China.
| | - Zhiyong Zhang
- Beijing Key Laboratory of Ornamental Plants Germplasm Innovation and Molecular Breeding, National Engineering Research Center for Floriculture, Beijing Laboratory of Urban and Rural Ecological Environment, Key Laboratory of Genetics and Breeding in Forest Trees and Ornamental Plants of Ministry of Education, School of Landscape Architecture, Beijing Forestry University, Beijing 100083, China.
| | - Xiaoming Pang
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China.
| | - Yingyue Li
- National Engineering Laboratory for Tree Breeding, College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China.
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25
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Pucher A, Hash CT, Wallace JG, Han S, Leiser WL, Haussmann BIG. Mapping a male-fertility restoration locus for the A 4 cytoplasmic-genic male-sterility system in pearl millet using a genotyping-by-sequencing-based linkage map. BMC PLANT BIOLOGY 2018; 18:65. [PMID: 29665794 PMCID: PMC5905146 DOI: 10.1186/s12870-018-1267-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Accepted: 03/12/2018] [Indexed: 05/29/2023]
Abstract
BACKGROUND Pearl millet (Pennisetum glaucum (L.) R. Br., syn. Cenchrus americanus (L.) R. Br) is an important cereal and fodder crop in hot and arid environments. There is great potential to improve pearl millet production through hybrid breeding. Cytoplasmic male sterility (CMS) and the corresponding nuclear fertility restoration / sterility maintenance genes (Rfs) are essential tools for economic hybrid seed production in pearl millet. Mapping the Rf genes of the A4 CMS system in pearl millet would enable more efficient introgression of both dominant male-fertility restoration alleles (Rf) and their recessive male-sterility maintenance counterparts (rf). RESULTS A high density linkage map based on single nucleotide polymorphism (SNP) markers was generated using an F2 mapping population and genotyping-by-sequencing (GBS). The parents of this cross were 'ICMA 02777' and 'ICMR 08888', which segregate for the A4 Rf locus. The linkage map consists of 460 SNP markers distributed mostly evenly and has a total length of 462 cM. The segregation ratio of male-fertile and male-sterile plants (3:1) based on pollen production (presence/absence) indicated monogenic dominant inheritance of male-fertility restoration. Correspondingly, a major quantitative trait locus (QTL) for pollen production was found on linkage group 2, with cross-validation showing a very high QTL occurrence (97%). The major QTL was confirmed using selfed seed set as phenotypic trait, though with a lower precision. However, these QTL explained only 14.5% and 9.9% of the phenotypic variance of pollen production and selfed seed set, respectively, which was below expectation. Two functional KASP markers were developed for the identified locus. CONCLUSION This study identified a major QTL for male-fertility restoration using a GBS-based linkage map and developed KASP markers which support high-throughput screening of the haploblock. This is a first step toward marker-assisted selection of A4 male-fertility restoration and male-sterility maintenance in pearl millet.
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Affiliation(s)
- Anna Pucher
- Institute of Plant Breeding, Seed Science and Population Genetics, Fruwirthstr University of Hohenheim, 21, D-70599 Stuttgart, Germany
| | - C. Tom Hash
- ICRISAT Sahelian Center, 12404 Niamey, BP Niger
| | - Jason G. Wallace
- Department of Crop and Soil Sciences, the University of Georgia, 30602 Athens, GA USA
| | - Sen Han
- Institute of Plant Breeding, Seed Science and Population Genetics, Fruwirthstr University of Hohenheim, 21, D-70599 Stuttgart, Germany
| | - Willmar L. Leiser
- State Plant Breeding Institute, University of Hohenheim, Fruwirthstr, 21, D-70599 Stuttgart, Germany
| | - Bettina I. G. Haussmann
- Institute of Plant Breeding, Seed Science and Population Genetics, Fruwirthstr University of Hohenheim, 21, D-70599 Stuttgart, Germany
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26
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Dudhate A, Shinde H, Tsugama D, Liu S, Takano T. Transcriptomic analysis reveals the differentially expressed genes and pathways involved in drought tolerance in pearl millet [Pennisetum glaucum (L.) R. Br]. PLoS One 2018; 13:e0195908. [PMID: 29652907 PMCID: PMC5898751 DOI: 10.1371/journal.pone.0195908] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 04/02/2018] [Indexed: 12/17/2022] Open
Abstract
Pearl millet is a cereal crop known for its high tolerance to drought, heat and salinity stresses as well as for its nutritional quality. The molecular mechanism of drought tolerance in pearl millet is unknown. Here we attempted to unravel the molecular basis of drought tolerance in two pearl millet inbred lines, ICMB 843 and ICMB 863 using RNA sequencing. Under greenhouse condition, ICMB 843 was found to be more tolerant to drought than ICMB 863. We sequenced the root transcriptome from both lines under control and drought conditions using an Illumina Hi-Seq platform, generating 139.1 million reads. Mapping of sequenced reads against the foxtail millet genome, which has been relatively well-annotated, led to the identification of several differentially expressed genes under drought stress. Total of 6799 and 1253 differentially expressed genes were found in ICMB 843 and ICMB 863, respectively. Pathway and gene function analysis by KEGG online tool revealed that the drought response in pearl millet is mainly regulated by pathways related to photosynthesis, plant hormone signal transduction and mitogen-activated protein kinase signaling. The changes in expression of drought-responsive genes determined by RNA sequencing were confirmed by reverse-transcription PCR for 7 genes. These results are a first step to understanding the molecular mechanisms of drought tolerance in pearl millet and lay a foundation for its genetic improvement.
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Affiliation(s)
- Ambika Dudhate
- Asian Natural Environmental Science Center (ANESC), the University of Tokyo, Nishitokyo-shi, Tokyo, Japan
| | - Harshraj Shinde
- Asian Natural Environmental Science Center (ANESC), the University of Tokyo, Nishitokyo-shi, Tokyo, Japan
| | | | - Shenkui Liu
- State Key Laboratory of Subtropical Silviculture, Zhejiang A and F University, Lin’an, Hangzhou, China
| | - Tetsuo Takano
- Asian Natural Environmental Science Center (ANESC), the University of Tokyo, Nishitokyo-shi, Tokyo, Japan
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Jaiswal S, Antala TJ, Mandavia MK, Chopra M, Jasrotia RS, Tomar RS, Kheni J, Angadi UB, Iquebal MA, Golakia BA, Rai A, Kumar D. Transcriptomic signature of drought response in pearl millet (Pennisetum glaucum (L.) and development of web-genomic resources. Sci Rep 2018; 8:3382. [PMID: 29467369 PMCID: PMC5821703 DOI: 10.1038/s41598-018-21560-1] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Accepted: 02/04/2018] [Indexed: 01/12/2023] Open
Abstract
Pearl millet, (Pennisetum glaucum L.), an efficient (C4) crop of arid/semi-arid regions is known for hardiness. Crop is valuable for bio-fortification combating malnutrition and diabetes, higher caloric value and wider climatic resilience. Limited studies are done in pot-based experiments for drought response at gene-expression level, but field-based experiment mimicking drought by withdrawal of irrigation is still warranted. We report de novo assembly-based transcriptomic signature of drought response induced by irrigation withdrawal in pearl millet. We found 19983 differentially expressed genes, 7595 transcription factors, gene regulatory network having 45 hub genes controlling drought response. We report 34652 putative markers (4192 simple sequence repeats, 12111 SNPs and 6249 InDels). Study reveals role of purine and tryptophan metabolism in ABA accumulation mediating abiotic response in which MAPK acts as major intracellular signal sensing drought. Results were validated by qPCR of 13 randomly selected genes. We report the first web-based genomic resource ( http://webtom.cabgrid.res.in/pmdtdb/ ) which can be used for candidate genes-based SNP discovery programs and trait-based association studies. Looking at climatic change, nutritional and pharmaceutical importance of this crop, present investigation has immense value in understanding drought response in field condition. This is important in germplasm management and improvement in endeavour of pearl millet productivity.
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Affiliation(s)
- Sarika Jaiswal
- Centre for Agricultural Bioinformatics (CABin), ICAR-Indian Agricultural Statistics Research Institute, New Delhi, India
| | - Tushar J Antala
- Department of Biochemistry and Biotechnology, Junagadh Agricultural University, Junagadh, Gujarat, India
| | - M K Mandavia
- Department of Biochemistry and Biotechnology, Junagadh Agricultural University, Junagadh, Gujarat, India
| | - Meenu Chopra
- Centre for Agricultural Bioinformatics (CABin), ICAR-Indian Agricultural Statistics Research Institute, New Delhi, India
| | - Rahul Singh Jasrotia
- Centre for Agricultural Bioinformatics (CABin), ICAR-Indian Agricultural Statistics Research Institute, New Delhi, India
| | - Rukam S Tomar
- Department of Biochemistry and Biotechnology, Junagadh Agricultural University, Junagadh, Gujarat, India
| | - Jashminkumar Kheni
- Department of Biochemistry and Biotechnology, Junagadh Agricultural University, Junagadh, Gujarat, India
| | - U B Angadi
- Centre for Agricultural Bioinformatics (CABin), ICAR-Indian Agricultural Statistics Research Institute, New Delhi, India
| | - M A Iquebal
- Centre for Agricultural Bioinformatics (CABin), ICAR-Indian Agricultural Statistics Research Institute, New Delhi, India
| | - B A Golakia
- Department of Biochemistry and Biotechnology, Junagadh Agricultural University, Junagadh, Gujarat, India
| | - Anil Rai
- Centre for Agricultural Bioinformatics (CABin), ICAR-Indian Agricultural Statistics Research Institute, New Delhi, India
| | - Dinesh Kumar
- Centre for Agricultural Bioinformatics (CABin), ICAR-Indian Agricultural Statistics Research Institute, New Delhi, India.
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Ates D, Aldemir S, Alsaleh A, Erdogmus S, Nemli S, Kahriman A, Ozkan H, Vandenberg A, Tanyolac B. A consensus linkage map of lentil based on DArT markers from three RIL mapping populations. PLoS One 2018; 13:e0191375. [PMID: 29351563 PMCID: PMC5774769 DOI: 10.1371/journal.pone.0191375] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Accepted: 01/03/2018] [Indexed: 12/21/2022] Open
Abstract
Background Lentil (Lens culinaris ssp. culinaris Medikus) is a diploid (2n = 2x = 14), self-pollinating grain legume with a haploid genome size of about 4 Gbp and is grown throughout the world with current annual production of 4.9 million tonnes. Materials and methods A consensus map of lentil (Lens culinaris ssp. culinaris Medikus) was constructed using three different lentils recombinant inbred line (RIL) populations, including “CDC Redberry” x “ILL7502” (LR8), “ILL8006” x “CDC Milestone” (LR11) and “PI320937” x “Eston” (LR39). Results The lentil consensus map was composed of 9,793 DArT markers, covered a total of 977.47 cM with an average distance of 0.10 cM between adjacent markers and constructed 7 linkage groups representing 7 chromosomes of the lentil genome. The consensus map had no gap larger than 12.67 cM and only 5 gaps were found to be between 12.67 cM and 6.0 cM (on LG3 and LG4). The localization of the SNP markers on the lentil consensus map were in general consistent with their localization on the three individual genetic linkage maps and the lentil consensus map has longer map length, higher marker density and shorter average distance between the adjacent markers compared to the component linkage maps. Conclusion This high-density consensus map could provide insight into the lentil genome. The consensus map could also help to construct a physical map using a Bacterial Artificial Chromosome library and map based cloning studies. Sequence information of DArT may help localization of orientation scaffolds from Next Generation Sequencing data.
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Affiliation(s)
- Duygu Ates
- Department of Bioengineering, Faculty of Engineering, Ege University, Bornova, Izmir, Turkey
| | - Secil Aldemir
- Department of Bioengineering, Faculty of Engineering, Ege University, Bornova, Izmir, Turkey
| | - Ahmad Alsaleh
- Department of Field Crops, Faculty of Agriculture, Cukurova University, Adana, Turkey
| | - Semih Erdogmus
- Department of Bioengineering, Faculty of Engineering, Ege University, Bornova, Izmir, Turkey
| | - Seda Nemli
- Department of Bieoengineering and Genetics, Gumushane University, Gumushane, Turkey
| | - Abdullah Kahriman
- Department of Field Crops, Faculty of Agriculture, Harran University, Sanlı Urfa, Turkey
| | - Hakan Ozkan
- Department of Field Crops, Faculty of Agriculture, Cukurova University, Adana, Turkey
| | - Albert Vandenberg
- Crop Development Centre, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Bahattin Tanyolac
- Department of Bioengineering, Faculty of Engineering, Ege University, Bornova, Izmir, Turkey
- * E-mail:
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29
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Kumar S, Hash CT, Nepolean T, Satyavathi CT, Singh G, Mahendrakar MD, Yadav RS, Srivastava RK. Mapping QTLs Controlling Flowering Time and Important Agronomic Traits in Pearl Millet. FRONTIERS IN PLANT SCIENCE 2017; 8:1731. [PMID: 29326729 PMCID: PMC5742331 DOI: 10.3389/fpls.2017.01731] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 09/21/2017] [Indexed: 05/29/2023]
Abstract
Pearl millet [Pennisetum glaucum (L.) R. Br.] is a staple crop for the people of arid and semi-arid regions of the world. It is fast gaining importance as a climate resilient nutricereal. Exploiting the bold seeded, semi-dwarf, and early flowering genotypes in pearl millet is a key breeding strategy to enhance yield, adaptability, and for adequate food in resource-poor zones. Genetic variation for agronomic traits of pearl millet inbreds can be used to dissect complex traits through quantitative trait locus (QTL) mapping. This study was undertaken to map a set of agronomically important traits like flowering time (FT), plant height (PH), panicle length (PL), and grain weight (self and open-pollinated seeds) in the recombinant inbred line (RIL) population of ICMB 841-P3 × 863B-P2 cross. Excluding grain weight (open pollinated), heritabilities for FT, PH, PL, grain weight (selfed) were in high to medium range. A total of six QTLs for FT were detected on five chromosomes, 13 QTLs for PH on six chromosomes, 11 QTLs for PL on five chromosomes, and 14 QTLs for 1,000-grain weight (TGW) spanning five chromosomes. One major QTL on LG3 was common for FT and PH. Three major QTLs for PL, one each on LG1, LG2, and LG6B were detected. The large effect QTL for TGW (self) on LG6B had a phenotypic variance (R2) of 62.1%. The R2 for FT, TGW (self), and PL ranged from 22.3 to 59.4%. A total of 21 digenic interactions were discovered for FT (R2 = 18-40%) and PL (R2 = 13-19%). The epistatic effects did not reveal any significant QTL × QTL × environment (QQE) interactions. The mapped QTLs for flowering time and other agronomic traits in present experiment can be used for marker-assisted selection (MAS) and genomic selection (GS) breeding programs.
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Affiliation(s)
- Sushil Kumar
- Plant Biotechnology Centre, Swami Keshwanand Rajasthan Agricultural University, Bikaner, India
- International Crops Research Institute for the Semi-Arid Tropics, Patancheru, India
- Centre of Excellence in Biotechnology, Anand Agricultural University, Anand, India
| | - C. Tom Hash
- International Crops Research Institute for the Semi-Arid Tropics, Niamey, Niger
| | - T. Nepolean
- Indian Agricultural Research Institute, New Delhi, India
| | | | - Govind Singh
- Plant Biotechnology Centre, Swami Keshwanand Rajasthan Agricultural University, Bikaner, India
| | | | - Rattan S. Yadav
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, United Kingdom
| | - Rakesh K. Srivastava
- International Crops Research Institute for the Semi-Arid Tropics, Patancheru, India
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30
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Varshney RK, Shi C, Thudi M, Mariac C, Wallace J, Qi P, Zhang H, Zhao Y, Wang X, Rathore A, Srivastava RK, Chitikineni A, Fan G, Bajaj P, Punnuri S, Gupta SK, Wang H, Jiang Y, Couderc M, Katta MAVSK, Paudel DR, Mungra KD, Chen W, Harris-Shultz KR, Garg V, Desai N, Doddamani D, Kane NA, Conner JA, Ghatak A, Chaturvedi P, Subramaniam S, Yadav OP, Berthouly-Salazar C, Hamidou F, Wang J, Liang X, Clotault J, Upadhyaya HD, Cubry P, Rhoné B, Gueye MC, Sunkar R, Dupuy C, Sparvoli F, Cheng S, Mahala RS, Singh B, Yadav RS, Lyons E, Datta SK, Hash CT, Devos KM, Buckler E, Bennetzen JL, Paterson AH, Ozias-Akins P, Grando S, Wang J, Mohapatra T, Weckwerth W, Reif JC, Liu X, Vigouroux Y, Xu X. Pearl millet genome sequence provides a resource to improve agronomic traits in arid environments. Nat Biotechnol 2017; 35:969-976. [PMID: 28922347 PMCID: PMC6871012 DOI: 10.1038/nbt.3943] [Citation(s) in RCA: 207] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Accepted: 07/17/2017] [Indexed: 01/21/2023]
Abstract
Draft genome, 994 re-sequenced lines and GWAS for yield-traits provide a resource of genetics and genomics tools for pearl millet researchers and breeders. Pearl millet [Cenchrus americanus (L.) Morrone] is a staple food for more than 90 million farmers in arid and semi-arid regions of sub-Saharan Africa, India and South Asia. We report the ∼1.79 Gb draft whole genome sequence of reference genotype Tift 23D2B1-P1-P5, which contains an estimated 38,579 genes. We highlight the substantial enrichment for wax biosynthesis genes, which may contribute to heat and drought tolerance in this crop. We resequenced and analyzed 994 pearl millet lines, enabling insights into population structure, genetic diversity and domestication. We use these resequencing data to establish marker trait associations for genomic selection, to define heterotic pools, and to predict hybrid performance. We believe that these resources should empower researchers and breeders to improve this important staple crop.
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Affiliation(s)
- Rajeev K Varshney
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana State, India
| | | | - Mahendar Thudi
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana State, India
| | - Cedric Mariac
- Institut de recherche pour le développement (IRD), Montpellier, France
| | | | - Peng Qi
- University of Georgia, Athens, Georgia, USA
| | | | - Yusheng Zhao
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany
| | - Xiyin Wang
- University of Georgia, Athens, Georgia, USA
| | - Abhishek Rathore
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana State, India
| | - Rakesh K Srivastava
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana State, India
| | - Annapurna Chitikineni
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana State, India
| | | | - Prasad Bajaj
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana State, India
| | | | - S K Gupta
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana State, India
| | - Hao Wang
- Cornell University, Ithaca, New York, USA
| | - Yong Jiang
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany
| | - Marie Couderc
- Institut de recherche pour le développement (IRD), Montpellier, France
| | - Mohan A V S K Katta
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana State, India
| | - Dev R Paudel
- University of Florida, Gainesville, Florida, USA
| | - K D Mungra
- Junagadh Agricultural University, Jamnagar, Gujarat, India
| | | | - Karen R Harris-Shultz
- United States Department of Agriculture-Agricultural Research Service (USDA-ARS), Tifton, Georgia, USA
| | - Vanika Garg
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana State, India
| | - Neetin Desai
- Department of Ecogenomics and Systems Biology, University of Vienna, Vienna, Austria.,Amity University, Mumbai, Maharashtra, India
| | - Dadakhalandar Doddamani
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana State, India
| | - Ndjido Ardo Kane
- Institut Sénégalais de Recherches Agricoles (ISRA), Dakar, Senegal
| | | | - Arindam Ghatak
- Department of Ecogenomics and Systems Biology, University of Vienna, Vienna, Austria.,School of Bioinformatics and Biotechnology, D.Y. Patil University, Mumbai, Maharashtra, India
| | - Palak Chaturvedi
- Department of Ecogenomics and Systems Biology, University of Vienna, Vienna, Austria
| | - Sabarinath Subramaniam
- University of Arizona, Tucson, Arizona, USA.,Phoenix Bioinformatics, Redwood City, California, USA
| | - Om Parkash Yadav
- Indian Council of Agricultural Research (ICAR)-Central Arid Zone Research Institute (CAZRI), Jodhpur, Rajasthan, India
| | - Cécile Berthouly-Salazar
- Institut de recherche pour le développement (IRD), Montpellier, France.,Laboratoire Mixte International Adaptation des Plantes et Microorganismes Associés aux Stress Environnementaux, Centre de Recherche de Bel Air, Dakar, Senegal
| | - Falalou Hamidou
- ICRISAT Sahelian Center, Niamey, Niger.,Faculty of Sciences and Techniques, University Abdou Moumouni, Niamey, Niger
| | | | | | - Jérémy Clotault
- Institut de recherche pour le développement (IRD), Montpellier, France.,University of Montpellier, Montpellier, France
| | - Hari D Upadhyaya
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana State, India
| | - Philippe Cubry
- Institut de recherche pour le développement (IRD), Montpellier, France
| | - Bénédicte Rhoné
- Institut de recherche pour le développement (IRD), Montpellier, France.,Laboratoire de biométrie et Biologie Evolutive, Université Lyon 1, Villeurbanne, France
| | - Mame Codou Gueye
- Institut Sénégalais de Recherches Agricoles (ISRA), Dakar, Senegal
| | | | | | - Francesca Sparvoli
- CNR-Consiglio Nazionale delle Ricerche, Istituto di Biologia e Biotecnologia Agraria, Milan, Italy
| | | | - R S Mahala
- Pioneer Hi-Bred Private Limited, Hyderabad, Telangana State, India
| | - Bharat Singh
- Fort Valley State University, Fort Valley, Georgia, USA
| | - Rattan S Yadav
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Ceredigion, UK
| | - Eric Lyons
- University of Arizona, Tucson, Arizona, USA
| | | | | | | | - Edward Buckler
- Cornell University, Ithaca, New York, USA.,USDA-ARS, Ithaca, New York, USA
| | | | | | | | - Stefania Grando
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Hyderabad, Telangana State, India
| | | | | | - Wolfram Weckwerth
- Department of Ecogenomics and Systems Biology, University of Vienna, Vienna, Austria.,Vienna Metabolomics Center (VIME), University of Vienna, Vienna, Austria
| | - Jochen C Reif
- Leibniz Institute of Plant Genetics and Crop Plant Research (IPK), Gatersleben, Germany
| | - Xin Liu
- BGI-Shenzhen, Shenzhen, China.,BGI-Qingdao, Qingdao, China
| | - Yves Vigouroux
- Institut de recherche pour le développement (IRD), Montpellier, France.,University of Montpellier, Montpellier, France
| | - Xun Xu
- BGI-Shenzhen, Shenzhen, China.,BGI-Qingdao, Qingdao, China.,China National GeneBank (CNGB), Shenzen, China
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Guo LN, Gao XF. Genetic diversity and population structure of Indigofera szechuensis complex (Fabaceae) based on EST-SSR markers. Gene 2017; 624:26-33. [DOI: 10.1016/j.gene.2017.04.047] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Revised: 04/25/2017] [Accepted: 04/28/2017] [Indexed: 10/19/2022]
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Shivhare R, Lata C. Exploration of Genetic and Genomic Resources for Abiotic and Biotic Stress Tolerance in Pearl Millet. FRONTIERS IN PLANT SCIENCE 2017; 7:2069. [PMID: 28167949 PMCID: PMC5253385 DOI: 10.3389/fpls.2016.02069] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 12/27/2016] [Indexed: 05/05/2023]
Abstract
Pearl millet is one of the most important small-grained C4 Panicoid crops with a large genome size (∼2352 Mb), short life cycle and outbreeding nature. It is highly resilient to areas with scanty rain and high temperature. Pearl millet is a nutritionally superior staple crop for people inhabiting hot, drought-prone arid and semi-arid regions of South Asia and Africa where it is widely grown and used for food, hay, silage, bird feed, building material, and fuel. Having excellent nutrient composition and exceptional buffering capacity against variable climatic conditions and pathogen attack makes pearl millet a wonderful model crop for stress tolerance studies. Pearl millet germplasm show a large range of genotypic and phenotypic variations including tolerance to abiotic and biotic stresses. Conventional breeding for enhancing abiotic and biotic stress resistance in pearl millet have met with considerable success, however, in last few years various novel approaches including functional genomics and molecular breeding have been attempted in this crop for augmenting yield under adverse environmental conditions, and there is still a lot of scope for further improvement using genomic tools. Discovery and use of various DNA-based markers such as EST-SSRs, DArT, CISP, and SSCP-SNP in pearl millet not only help in determining population structure and genetic diversity but also prove to be important for developing strategies for crop improvement at a faster rate and greater precision. Molecular marker-based genetic linkage maps and identification of genomic regions determining yield under abiotic stresses particularly terminal drought have paved way for marker-assisted selection and breeding of pearl millet cultivars. Reference collections and marker-assisted backcrossing have also been used to improve biotic stress resistance in pearl millet specifically to downy mildew. Whole genome sequencing of pearl millet genome will give new insights for processing of functional genes and assist in crop improvement programs through molecular breeding approaches. This review thus summarizes the exploration of pearl millet genetic and genomic resources for improving abiotic and biotic stress resistance and development of cultivars superior in stress tolerance.
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Affiliation(s)
- Radha Shivhare
- National Botanical Research Institute (CSIR)Lucknow, India
- Academy of Scientific and Innovative ResearchNew Delhi, India
| | - Charu Lata
- National Botanical Research Institute (CSIR)Lucknow, India
- Academy of Scientific and Innovative ResearchNew Delhi, India
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Anuradha N, Satyavathi CT, Bharadwaj C, Nepolean T, Sankar SM, Singh SP, Meena MC, Singhal T, Srivastava RK. Deciphering Genomic Regions for High Grain Iron and Zinc Content Using Association Mapping in Pearl Millet. FRONTIERS IN PLANT SCIENCE 2017; 8:412. [PMID: 28507551 PMCID: PMC5410614 DOI: 10.3389/fpls.2017.00412] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 03/10/2017] [Indexed: 05/11/2023]
Abstract
Micronutrient malnutrition, especially deficiency of two mineral elements, iron [Fe] and zinc [Zn] in the developing world needs urgent attention. Pearl millet is one of the best crops with many nutritional properties and is accessible to the poor. We report findings of the first attempt to mine favorable alleles for grain iron and zinc content through association mapping in pearl millet. An association mapping panel of 130 diverse lines was evaluated at Delhi, Jodhpur and Dharwad, representing all the three pearl millet growing agro-climatic zones of India, during 2014 and 2015. Wide range of variation was observed for grain iron (32.3-111.9 ppm) and zinc (26.6-73.7 ppm) content. Genotyping with 114 representative polymorphic SSRs revealed 0.35 mean gene diversity. STRUCTURE analysis revealed presence of three sub-populations which was further supported by Neighbor-Joining method of clustering and principal coordinate analysis (PCoA). Marker-trait associations (MTAs) were analyzed with 267 markers (250 SSRs and 17 genic markers) in both general linear model (GLM) and mixed linear model (MLM), however, MTAs resulting from MLM were considered for more robustness of the associations. After appropriate Bonferroni correction, Xpsmp 2261 (13.34% R2-value), Xipes 0180 (R2-value of 11.40%) and Xipes 0096 (R2-value of 11.38%) were consistently associated with grain iron and zinc content for all the three locations. Favorable alleles and promising lines were identified for across and specific environments. PPMI 1102 had highest number (7) of favorable alleles, followed by four each for PPMFeZMP 199 and PPMI 708 for across the environment performance for both grain Fe and Zn content, while PPMI 1104 had alleles specific to Dharwad for grain Fe and Zn content. When compared with the reference genome Tift 23D2B1-P1-P5, Xpsmp 2261 amplicon was identified in intergenic region on pseudomolecule 5, while the other marker, Xipes 0810 was observed to be overlapping with aspartic proteinase (Asp) gene on pseudomolecule 3. Thus, this study can help in breeding new lines with enhanced micronutrient content using marker-assisted selection (MAS) in pearl millet leading to improved well-being especially for women and children.
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Affiliation(s)
- N. Anuradha
- Division of Genetics, ICAR-Indian Agricultural Research InstituteNew Delhi, India
| | - C. Tara Satyavathi
- Division of Genetics, ICAR-Indian Agricultural Research InstituteNew Delhi, India
- *Correspondence: C. Tara Satyavathi
| | - C. Bharadwaj
- Division of Genetics, ICAR-Indian Agricultural Research InstituteNew Delhi, India
| | - T. Nepolean
- Division of Genetics, ICAR-Indian Agricultural Research InstituteNew Delhi, India
| | - S. Mukesh Sankar
- Division of Genetics, ICAR-Indian Agricultural Research InstituteNew Delhi, India
| | - Sumer P. Singh
- Division of Genetics, ICAR-Indian Agricultural Research InstituteNew Delhi, India
| | - Mahesh C. Meena
- Division of Soil Science and Agricultural Chemistry, ICAR-Indian Agricultural Research InstituteNew Delhi, India
| | - Tripti Singhal
- Division of Genetics, ICAR-Indian Agricultural Research InstituteNew Delhi, India
| | - Rakesh K. Srivastava
- International Crops Research Institute for the Semi-Arid TropicsPatancheru, India
- Rakesh K. Srivastava
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Ramya AR, Ahamed M L, Satyavathi CT, Rathore A, Katiyar P, Raj AGB, Kumar S, Gupta R, Mahendrakar MD, Yadav RS, Srivastava RK. Towards Defining Heterotic Gene Pools in Pearl Millet [ Pennisetum glaucum (L.) R. Br.]. FRONTIERS IN PLANT SCIENCE 2017; 8:1934. [PMID: 29552020 PMCID: PMC5841052 DOI: 10.3389/fpls.2017.01934] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 10/26/2017] [Indexed: 05/09/2023]
Abstract
Pearl millet is a climate resilient crop and one of the most widely grown millets worldwide. Heterotic hybrid development is one of the principal breeding objectives in pearl millet. In a maiden attempt to identify heterotic groups for grain yield, a total of 343 hybrid parental [maintainer (B-) and restorer (R-)] lines were genotyped with 88 polymorphic SSR markers. The SSRs generated a total of 532 alleles with a mean value of 6.05 alleles per locus, mean gene diversity of 0.55, and an average PIC of 0.50. Out of 532 alleles, 443 (83.27%) alleles were contributed by B-lines with a mean of 5.03 alleles per locus. R-lines contributed 476 alleles (89.47%) with a mean of 5.41, while 441 (82.89%) alleles were shared commonly between B- and R-lines. The gene diversity was higher among R-lines (0.55) compared to B-lines (0.49). The unweighted neighbor-joining tree based on simple matching dissimilarity matrix obtained from SSR data clearly differentiated B- lines into 10 sub-clusters (B1 through B10), and R- lines into 11 sub-clusters (R1 through R11). A total of 99 hybrids (generated by crossing representative 9 B- and 11 R- lines) along with checks were evaluated in the hybrid trial. The 20 parents were evaluated in the line trial. Both the trials were evaluated in three environments. Based on per se performance, high sca effects and standard heterosis, F1s generated from crosses between representatives of groups B10R5, B3R5, B3R6, B4UD, B5R11, B2R4, and B9R9 had high specific combining ability for grain yield compared to rest of the crosses. These groups may represent putative heterotic gene pools in pearl millet.
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Affiliation(s)
- A. Radhika Ramya
- Department of Genetics and Plant Breeding, Acharya N. G. Ranga Agricultural University, Guntur, India
- International Crops Research Institute for the Semi-Arid Crops, Patancheru, India
| | - Lal Ahamed M
- Department of Genetics and Plant Breeding, Acharya N. G. Ranga Agricultural University, Guntur, India
| | - C. Tara Satyavathi
- All India Coordinated Research Project on Pearl Millet, Indian Council of Agricultural Research, Jodhpur, India
| | - Abhishek Rathore
- International Crops Research Institute for the Semi-Arid Crops, Patancheru, India
| | - Pooja Katiyar
- International Crops Research Institute for the Semi-Arid Crops, Patancheru, India
| | - A. G. Bhasker Raj
- International Crops Research Institute for the Semi-Arid Crops, Patancheru, India
| | - Sushil Kumar
- Centre of Excellence in Biotechnology, Anand Agricultural University, Anand, India
| | - Rajeev Gupta
- International Crops Research Institute for the Semi-Arid Crops, Patancheru, India
| | | | - Rattan S. Yadav
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth University, Aberystwyth, United Kingdom
| | - Rakesh K. Srivastava
- International Crops Research Institute for the Semi-Arid Crops, Patancheru, India
- *Correspondence: Rakesh K. Srivastava
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Kumar S, Hash CT, Thirunavukkarasu N, Singh G, Rajaram V, Rathore A, Senapathy S, Mahendrakar MD, Yadav RS, Srivastava RK. Mapping Quantitative Trait Loci Controlling High Iron and Zinc Content in Self and Open Pollinated Grains of Pearl Millet [ Pennisetum glaucum (L.) R. Br.]. FRONTIERS IN PLANT SCIENCE 2016; 7:1636. [PMID: 27933068 PMCID: PMC5120122 DOI: 10.3389/fpls.2016.01636] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Accepted: 10/17/2016] [Indexed: 05/05/2023]
Abstract
Pearl millet is a multipurpose grain/fodder crop of the semi-arid tropics, feeding many of the world's poorest and most undernourished people. Genetic variation among adapted pearl millet inbreds and hybrids suggests it will be possible to improve grain micronutrient concentrations by selective breeding. Using 305 loci, a linkage map was constructed to map QTLs for grain iron [Fe] and zinc [Zn] using replicated samples of 106 pearl millet RILs (F6) derived from ICMB 841-P3 × 863B-P2. The grains of the RIL population were evaluated for Fe and Zn content using atomic absorption spectrophotometer. Grain mineral concentrations ranged from 28.4 to 124.0 ppm for Fe and 28.7 to 119.8 ppm for Zn. Similarly, grain Fe and Zn in open pollinated seeds ranged between 22.4-77.4 and 21.9-73.7 ppm, respectively. Mapping with 305 (96 SSRs; 208 DArT) markers detected seven linkage groups covering 1749 cM (Haldane) with an average intermarker distance of 5.73 cM. On the basis of two environment phenotypic data, two co-localized QTLs for Fe and Zn content on linkage group (LG) 3 were identified by composite interval mapping (CIM). Fe QTL explained 19% phenotypic variation, whereas the Zn QTL explained 36% phenotypic variation. Likewise for open pollinated seeds, the QTL analysis led to the identification of two QTLs for grain Fe content on LG3 and 5, and two QTLs for grain Zn content on LG3 and 7. The total phenotypic variance for Fe and Zn QTLs in open pollinated seeds was 16 and 42%, respectively. Analysis of QTL × QTL and QTL × QTL × environment interactions indicated no major epistasis.
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Affiliation(s)
- Sushil Kumar
- Plant Biotechnology Centre, Swami Keshwanand Rajasthan Agricultural UniversityBikaner, India; International Crops Research Institute for the Semi-Arid TropicsPatancheru, India; Centre of Excellence in Agricultural Biotechnology, Anand Agricultural UniversityAnand, India
| | - Charles T Hash
- International Crops Research Institute for the Semi-Arid Tropics Niamey, Niger
| | | | - Govind Singh
- Plant Biotechnology Centre, Swami Keshwanand Rajasthan Agricultural University Bikaner, India
| | - Vengaldas Rajaram
- International Crops Research Institute for the Semi-Arid Tropics Patancheru, India
| | - Abhishek Rathore
- International Crops Research Institute for the Semi-Arid Tropics Patancheru, India
| | | | - Mahesh D Mahendrakar
- International Crops Research Institute for the Semi-Arid Tropics Patancheru, India
| | - Rattan S Yadav
- Crop Genetics, Genomics and Breeding Division, Aberystwyth University Aberystwyth, UK
| | - Rakesh K Srivastava
- International Crops Research Institute for the Semi-Arid Tropics Patancheru, India
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Kulkarni KS, Zala HN, Bosamia TC, Shukla YM, Kumar S, Fougat RS, Patel MS, Narayanan S, Joshi CG. De novo Transcriptome Sequencing to Dissect Candidate Genes Associated with Pearl Millet-Downy Mildew (Sclerospora graminicola Sacc.) Interaction. FRONTIERS IN PLANT SCIENCE 2016; 7:847. [PMID: 27446100 PMCID: PMC4916200 DOI: 10.3389/fpls.2016.00847] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 05/30/2016] [Indexed: 05/21/2023]
Abstract
Understanding the plant-pathogen interactions is of utmost importance to design strategies for minimizing the economic deficits caused by pathogens in crops. With an aim to identify genes underlying resistance to downy mildew, a major disease responsible for productivity loss in pearl millet, transcriptome analysis was performed in downy mildew resistant and susceptible genotypes upon infection and control on 454 Roche NGS platform. A total of ~685 Mb data was obtained with 1 575 290 raw reads. The raw reads were pre-processed into high-quality (HQ) reads making to ~82% with an average of 427 bases. The assembly was optimized using four assemblers viz. Newbler, MIRA, CLC and Trinity, out of which MIRA with a total of 14.10 Mb and 90118 transcripts proved to be the best for assembling reads. Differential expression analysis depicted 1396 and 936 and 1000 and 1591 transcripts up and down regulated in resistant inoculated/resistant control and susceptible inoculated/susceptible control respectively with a common of 3644 transcripts. The pathways for secondary metabolism, specifically the phenylpropanoid pathway was up-regulated in resistant genotype. Transcripts up-regulated as a part of defense response included classes of R genes, PR proteins, HR induced proteins and plant hormonal signaling transduction proteins. The transcripts for skp1 protein, purothionin, V type proton ATPase were found to have the highest expression in resistant genotype. Ten transcripts, selected on the basis of their involvement in defense mechanism were validated with qRT-PCR and showed positive co-relation with transcriptome data. Transcriptome analysis evoked potentials of hypersensitive response and systemic acquired resistance as possible mechanism operating in defense mechanism in pearl millet against downy mildew infection.
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Affiliation(s)
- Kalyani S. Kulkarni
- Department of Agricultural Biotechnology, Anand Agricultural UniversityAnand, India
- Department of Biotechnology, ICAR-Indian Institute of Rice ResearchHyderabad, India
| | - Harshvardhan N. Zala
- Department of Agricultural Biotechnology, Anand Agricultural UniversityAnand, India
| | - Tejas C. Bosamia
- Department of Biotechnology, Junagadh Agriculture UniversityJunagadh, India
| | - Yogesh M. Shukla
- Department of Biochemistry, Anand Agricultural UniversityAnand, India
| | - Sushil Kumar
- Department of Agricultural Biotechnology, Anand Agricultural UniversityAnand, India
| | - Ranbir S. Fougat
- Department of Agricultural Biotechnology, Anand Agricultural UniversityAnand, India
| | - Mruduka S. Patel
- Department of Agricultural Biotechnology, Anand Agricultural UniversityAnand, India
| | | | - Chaitanya G. Joshi
- Department of Animal Biotechnology, Anand Agricultural UniversityAnand, India
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Singh AK, Singh R, Subramani R, Kumar R, Wankhede DP. Molecular Approaches to Understand Nutritional Potential of Coarse Cereals. Curr Genomics 2016; 17:177-92. [PMID: 27252585 PMCID: PMC4869005 DOI: 10.2174/1389202917666160202215308] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2015] [Revised: 06/26/2015] [Accepted: 06/29/2015] [Indexed: 01/01/2023] Open
Abstract
Coarse grains are important group of crops that constitutes staple food for large population residing primarily in the arid and semi-arid regions of the world. Coarse grains are designated as nutri-cereals as they are rich in essential amino acids, minerals and vitamins. In spite of having several nutritional virtues in coarse grain as mentioned above, there is still scope for improvement in quality parameters such as cooking qualities, modulation of nutritional constituents and reduction or elimination of anti-nutritional factors. Besides its use in traditional cooking, coarse grains have been used mainly in the weaning food preparation and other malted food production. Improvement in quality parameters will certainly increase consumer's preference for coarse grains and increase their demand. The overall genetic gain in quality traits of economic importance in the cultivated varieties will enhance their industrial value and simultaneously increase income of farmers growing these varieties. The urgent step for improvement of quality traits in coarse grains requires a detailed understanding of molecular mechanisms responsible for varied level of different nutritional contents in different genotypes of these crops. In this review we have discussed the progresses made in understanding of coarse grain biology with various omics tool coupled with modern breeding approaches and the current status with regard to our effort towards dissecting traits related to improvement of quality and nutritional constituents of grains.
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Affiliation(s)
- Amit Kumar Singh
- Division of Genomic Resources, ICAR- National Bureau of Plant Genetic Resources, New Delhi, India
| | - Rakesh Singh
- Division of Genomic Resources, ICAR- National Bureau of Plant Genetic Resources, New Delhi, India
| | - Rajkumar Subramani
- Division of Genomic Resources, ICAR- National Bureau of Plant Genetic Resources, New Delhi, India
| | - Rajesh Kumar
- Division of Genomic Resources, ICAR- National Bureau of Plant Genetic Resources, New Delhi, India
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Selection of suitable reference genes for assessing gene expression in pearl millet under different abiotic stresses and their combinations. Sci Rep 2016; 6:23036. [PMID: 26972345 PMCID: PMC4789795 DOI: 10.1038/srep23036] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 02/23/2016] [Indexed: 01/17/2023] Open
Abstract
Pearl millet [Pennisetum glaucum (L.) R. Br.] a widely used grain and forage crop, is grown in areas frequented with one or more abiotic stresses, has superior drought and heat tolerance and considered a model crop for stress tolerance studies. Selection of suitable reference genes for quantification of target stress-responsive gene expression through quantitative real-time (qRT)-PCR is important for elucidating the molecular mechanisms of improved stress tolerance. For precise normalization of gene expression data in pearl millet, ten candidate reference genes were examined in various developmental tissues as well as under different individual abiotic stresses and their combinations at 1 h (early) and 24 h (late) of stress using geNorm, NormFinder and RefFinder algorithms. Our results revealed EF-1α and UBC-E2 as the best reference genes across all samples, the specificity of which was confirmed by assessing the relative expression of a PgAP2 like-ERF gene that suggested use of these two reference genes is sufficient for accurate transcript normalization under different stress conditions. To our knowledge this is the first report on validation of reference genes under different individual and multiple abiotic stresses in pearl millet. The study can further facilitate fastidious discovery of stress-tolerance genes in this important stress-tolerant crop.
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Veena M, Melvin P, Prabhu SA, Shailasree S, Shetty HS, Kini KR. Molecular cloning of a coiled-coil-nucleotide-binding-site-leucine-rich repeat gene from pearl millet and its expression pattern in response to the downy mildew pathogen. Mol Biol Rep 2016; 43:117-28. [PMID: 26842722 DOI: 10.1007/s11033-016-3944-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2015] [Accepted: 01/22/2016] [Indexed: 12/01/2022]
Abstract
Downy mildew caused by Sclerospora graminicola is a devastating disease of pearl millet. Based on candidate gene approach, a set of 22 resistance gene analogues were identified. The clone RGPM 301 (AY117410) containing a partial sequence shared 83% similarity to rice R-proteins. A full-length R-gene RGA RGPM 301 of 3552 bp with 2979 bp open reading frame encoding 992 amino acids was isolated by the degenerate primers and rapid amplification of cDNA ends polymerase chain reaction (RACE-PCR) approach. It had a molecular mass of 113.96 kDa and isoelectric point (pI) of 8.71. The sequence alignment and phylogenetic analysis grouped it to a non-TIR NBS LRR group. The quantitative real-time PCR (qRT-PCR) analysis revealed higher accumulation of the transcripts following inoculation with S. graminicola in the resistant cultivar (IP18296) compared to susceptible cultivar (7042S). Further, significant induction in the transcript levels were observed when treated with abiotic elicitor β-aminobutyric acid (BABA) and biotic elicitor Pseudomonas fluorescens. Exogenous application of phytohormones jasmonic acid or salicylic acid also up-regulated the expression levels of RGA RGPM 301. The treatment of cultivar IP18296 with mitogen-activated protein kinase (MPK) inhibitors (PD98059 and U0126) suppressed the levels of RGA RGPM 301. A 3.5 kb RGA RGPM 301 which is a non-TIR NBS-LRR protein was isolated from pearl millet and its up-regulation during downy mildew interaction was demonstrated by qRT-PCR. These studies indicate a role for this RGA in pearl millet downy mildew interaction.
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Affiliation(s)
- Mariswamy Veena
- Department of Studies in Biotechnology, Manasagangotri, University of Mysore, Mysore, Karnataka, 570 006, India
| | - Prasad Melvin
- Department of Studies in Biotechnology, Manasagangotri, University of Mysore, Mysore, Karnataka, 570 006, India
| | - Sreedhara Ashok Prabhu
- Forestry and Agricultural Biotechnology Institute, University of Pretoria, Johannesburg, South Africa
| | - Sekhar Shailasree
- Institution of Excellence, Vijnana Bhavan, Manasagangotri, University of Mysore, Mysore, Karnataka, 570 006, India.
| | - Hunthrike Shekar Shetty
- Department of Studies in Biotechnology, Manasagangotri, University of Mysore, Mysore, Karnataka, 570 006, India
| | - Kukkundoor Ramachandra Kini
- Department of Studies in Biotechnology, Manasagangotri, University of Mysore, Mysore, Karnataka, 570 006, India
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Serba DD, Yadav RS. Genomic Tools in Pearl Millet Breeding for Drought Tolerance: Status and Prospects. FRONTIERS IN PLANT SCIENCE 2016; 7:1724. [PMID: 27920783 PMCID: PMC5118443 DOI: 10.3389/fpls.2016.01724] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Accepted: 11/02/2016] [Indexed: 05/09/2023]
Abstract
Pearl millet [Penisetum glaucum (L) R. Br.] is a hardy cereal crop grown in the arid and semiarid tropics where other cereals are likely to fail to produce economic yields due to drought and heat stresses. Adaptive evolution, a form of natural selection shaped the crop to grow and yield satisfactorily with limited moisture supply or under periodic water deficits in the soil. Drought tolerance is a complex polygenic trait that various morphological and physiological responses are controlled by 100s of genes and significantly influenced by the environment. The development of genomic tools will have enormous potential to improve the efficiency and precision of conventional breeding. The apparent independent domestication events, highly outcrossing nature and traditional cultivation in stressful environments maintained tremendous amount of polymorphism in pearl millet. This high polymorphism of the crop has been revealed by genome mapping that in turn stimulated the mapping and tagging of genomic regions controlling important traits such as drought tolerance. Mapping of a major QTL for terminal drought tolerance in independent populations envisaged the prospect for the development of molecular breeding in pearl millet. To accelerate genetic gains for drought tolerance targeted novel approaches such as establishment of marker-trait associations, genomic selection tools, genome sequence and genotyping-by-sequencing are still limited. Development and application of high throughput genomic tools need to be intensified to improve the breeding efficiency of pearl millet to minimize the impact of climate change on its production.
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Affiliation(s)
- Desalegn D. Serba
- Agricultural Research Center-Hays, Kansas State University, HaysKS, USA
- *Correspondence: Desalegn D. Serba,
| | - Rattan S. Yadav
- Institute of Biological, Environmental and Rural Sciences, Aberystwyth UniversityAberystwyth, UK
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Hu Z, Mbacké B, Perumal R, Guèye MC, Sy O, Bouchet S, Prasad PVV, Morris GP. Population genomics of pearl millet (Pennisetum glaucum (L.) R. Br.): Comparative analysis of global accessions and Senegalese landraces. BMC Genomics 2015; 16:1048. [PMID: 26654432 PMCID: PMC4674952 DOI: 10.1186/s12864-015-2255-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Accepted: 11/30/2015] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND Pearl millet is a staple food for people in arid and semi-arid regions of Africa and South Asia due to its high drought tolerance and nutritional qualities. A better understanding of the genomic diversity and population structure of pearl millet germplasm is needed to support germplasm conservation and genetic improvement of this crop. Here we characterized two pearl millet diversity panels, (i) a set of global accessions from Africa, Asia, and the America, and (ii) a collection of landraces from multiple agro-ecological zones in Senegal. RESULTS We identified 83,875 single nucleotide polymorphisms (SNPs) in 500 pearl millet accessions, comprised of 252 global accessions and 248 Senegalese landraces, using genotyping by sequencing (GBS) of PstI-MspI reduced representation libraries. We used these SNPs to characterize genomic diversity and population structure among the accessions. The Senegalese landraces had the highest levels of genetic diversity (π), while accessions from southern Africa and Asia showed lower diversity levels. Principal component analyses and ancestry estimation indicated clear population structure between the Senegalese landraces and the global accessions, and among countries in the global accessions. In contrast, little population structure was observed across in the Senegalese landraces collections. We ordered SNPs on the pearl millet genetic map and observed much faster linkage disequilibrium (LD) decay in Senegalese landraces compared to global accessions. A comparison of pearl millet GBS linkage map with the foxtail millet (Setaria italica) and sorghum (Sorghum bicolor) genomes indicated extensive regions of synteny, as well as some large-scale rearrangements in the pearl millet lineage. CONCLUSIONS We identified 83,875 SNPs as a genomic resource for pearl millet improvement. The high genetic diversity in Senegal relative to other regions of Africa and Asia supports a West African origin of this crop, followed by wide diffusion. The rapid LD decay and lack of confounding population structure along agro-ecological zones in Senegalese pearl millet will facilitate future association mapping studies. Comparative population genomics will provide insights into panicoid crop evolution and support improvement of these climate-resilient crops.
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Affiliation(s)
- Zhenbin Hu
- Department of Agronomy, Kansas State University, Manhattan, KS, 66506, USA.
| | - Bassirou Mbacké
- Ecole Nationale Supérieure d'Agriculture, Université de Thiès, Thiès, BP 296, Senegal.
| | - Ramasamy Perumal
- Department of Agronomy, Kansas State University, Manhattan, KS, 66506, USA.
- Agricultural Research Center-Hays, Kansas State University, Hays, KS, 67601, USA.
| | - Mame Codou Guèye
- Institut Sénégalais de Recherches Agricoles, Thiès, BP 3320, Senegal.
| | - Ousmane Sy
- Institut Sénégalais de Recherches Agricoles, Thiès, BP 3320, Senegal.
| | - Sophie Bouchet
- Department of Agronomy, Kansas State University, Manhattan, KS, 66506, USA.
| | - P V Vara Prasad
- Department of Agronomy, Kansas State University, Manhattan, KS, 66506, USA.
| | - Geoffrey P Morris
- Department of Agronomy, Kansas State University, Manhattan, KS, 66506, USA.
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Aparna K, Nepolean T, Srivastsava RK, Kholová J, Rajaram V, Kumar S, Rekha B, Senthilvel S, Hash CT, Vadez V. Quantitative trait loci associated with constitutive traits control water use in pearl millet [Pennisetum glaucum (L.) R. Br]. PLANT BIOLOGY (STUTTGART, GERMANY) 2015; 17:1073-84. [PMID: 25946470 DOI: 10.1111/plb.12343] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Accepted: 04/29/2015] [Indexed: 05/05/2023]
Abstract
There is substantial genetic variation for drought adaption in pearl millet in terms of traits controlling plant water use. It is important to understand genomic regions responsible for these traits. Here, F7 recombinant inbred lines were used to identify quantitative trait loci (QTL) and allelic interactions for traits affecting plant water use, and their relevance is discussed for crop productivity in water-limited environments. Four QTL contributed to increased transpiration rate under high vapour pressure deficit (VPD) conditions, all with alleles from drought-sensitive parent ICMB 841. Of these four QTL, a major QTL (35.7%) was mapped on linkage group (LG) 6. The alleles for 863B at this QTL decreased transpiration rate and this QTL co-mapped to a previously detected LG 6 QTL, with alleles from 863B for grain weight and panicle harvest index across severe terminal drought stress environments. This provided additional support for a link between water saving from a lower transpiration rate under high VPD and drought tolerance. 863B alleles in this same genomic region also increased shoot weight, leaf area and total transpiration under well-watered conditions. One unexpected outcome was reduced transpiration under high VPD (15%) from the interaction of two alleles for high VPD transpiration (LG 6 (B), 40.7) and specific leaf mass and biomass (LG 7 (A), 35.3), (A, allele from ICMB 841, B, allele from 863B, marker position). The LG 6 QTL appears to combine alleles for growth potential, beneficial for non-stress conditions, and for saving water under high evaporative demand, beneficial under stressful conditions. Mapping QTL for water-use traits, and assessing their interactions offers considerable potential for improving pearl millet adaptation to specific stress conditions through physiology-informed marker-assisted selection.
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Affiliation(s)
- K Aparna
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Crop Physiology Laboratory, Patancheru, India
- Centre for Biotechnology, IST, JNTUH, Kukatpally, Hyderabad, India
| | - T Nepolean
- Division of Genetics, Indian Agricultural Research Institute, New Delhi, India
| | - R K Srivastsava
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Crop Physiology Laboratory, Patancheru, India
| | - J Kholová
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Crop Physiology Laboratory, Patancheru, India
| | - V Rajaram
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Crop Physiology Laboratory, Patancheru, India
| | - S Kumar
- Centre of Excellence in Biotechnology, Anand Agricultural University, Anand, India
| | - B Rekha
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Crop Physiology Laboratory, Patancheru, India
| | - S Senthilvel
- Department of Crop Improvement, Directorate of Oilseeds Research, Hyderabad, India
| | - C T Hash
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), ICRISAT Sahelian Center, Niamey, Niger
| | - V Vadez
- International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), Crop Physiology Laboratory, Patancheru, India
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Jia HM, Jiao Y, Wang GY, Li YH, Jia HJ, Wu HX, Chai CY, Dong X, Guo Y, Zhang L, Gao QK, Chen W, Song LJ, van de Weg E, Gao ZS. Genetic diversity of male and female Chinese bayberry (Myrica rubra) populations and identification of sex-associated markers. BMC Genomics 2015; 16:394. [PMID: 25986380 PMCID: PMC4436740 DOI: 10.1186/s12864-015-1602-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Accepted: 05/01/2015] [Indexed: 11/25/2022] Open
Abstract
Background Chinese bayberry (Myrica rubra Sieb. & Zucc.) is an important subtropical evergreen fruit tree in southern China. Generally dioecious, the female plants are cultivated for fruit and have been studied extensively, but male plants have received very little attention. Knowledge of males may have a major impact on conservation and genetic improvement as well as on breeding. Using 84 polymorphic SSRs, we genotyped 213 M. rubra individuals (99 male individuals, 113 female varieties and 1 monoecious) and compared the difference in genetic diversity between the female and the male populations. Results Neighbour-joining cluster analysis separated M. rubra from three related species, and the male from female populations within M. rubra. By structure analysis, 178 M. rubra accessions were assigned to two subpopulations: Male dominated (98) and Female dominated (80). The well-known cultivars ‘Biqi’ and ‘Dongkui’, and the landraces ‘Fenhong’ are derived from three different gene pools. Female population had a slightly higher values of genetic diversity parameters (such as number of alleles and heterozygosity) than the male population, but not significantly different. The SSR loci ZJU062 and ZJU130 showed an empirical Fst value of 0.455 and 0.333, respectively, which are significantly above the 95 % confidence level, indicating that they are outlier loci related to sex separation. Conclusion The male and female populations of Chinese bayberry have similar genetic diversity in terms of average number of alleles and level of heterozygosity, but were clearly separated by genetic structure analysis due to two markers associated with sex type, ZJU062 and ZJU130. Zhejiang Province China could be the centre of diversity of M. rubra in China, with wide genetic diversity coverage; and the two representative cultivars ‘Biqi’ and ‘Dongkui’, and one landrace ‘Fenhong’ in three female subpopulations. This research provides genetic information on male and female Chinese bayberry and will act as a reference for breeding programs. Electronic supplementary material The online version of this article (doi:10.1186/s12864-015-1602-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Hui-min Jia
- Department of Horticulture, College of Agriculture and Biotechnology, Zhejiang University, 310058, Hangzhou, Zhejiang, China.
| | - Yun Jiao
- Department of Horticulture, College of Agriculture and Biotechnology, Zhejiang University, 310058, Hangzhou, Zhejiang, China.
| | - Guo-yun Wang
- Fruit Research Institute, 315400, Yuyao, Ningbo, PR China.
| | - Ying-hui Li
- The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI)/Key Lab of Germplasm Utilization (MOA), Chinese Academy of Agricultural Sciences, Institute of Crop Science, 100081, Beijing, China.
| | - Hui-juan Jia
- Department of Horticulture, College of Agriculture and Biotechnology, Zhejiang University, 310058, Hangzhou, Zhejiang, China.
| | - Hong-xia Wu
- Department of Horticulture, College of Agriculture and Biotechnology, Zhejiang University, 310058, Hangzhou, Zhejiang, China.
| | - Chun-yan Chai
- Forestry Technology Extension Center, 315300, Cixi, Ningbo, China.
| | - Xiao Dong
- Department of Horticulture, College of Agriculture and Biotechnology, Zhejiang University, 310058, Hangzhou, Zhejiang, China.
| | - Yanping Guo
- Department of Horticulture, College of Agriculture and Biotechnology, Zhejiang University, 310058, Hangzhou, Zhejiang, China.
| | - Liping Zhang
- Department of Horticulture, College of Agriculture and Biotechnology, Zhejiang University, 310058, Hangzhou, Zhejiang, China.
| | - Qi-kang Gao
- Bio-Macromolecules Analysis Lab, Analysis Center of Agrobiology, Environmental Sciences of Zhejiang University, 310058, Hangzhou, China.
| | - Wei Chen
- Zhejiang Institute of Subtropical Crops, Wenzhou, 325005, China.
| | - Li-Juan Song
- Wenzhou Vocational and Technical College, 325035, Wenzhou, China.
| | - Eric van de Weg
- Plant Breeding-Wageningen University and Research Centre, P.O. Box 16, 6700 AA, Wageningen, The Netherlands.
| | - Zhong-shan Gao
- Department of Horticulture, College of Agriculture and Biotechnology, Zhejiang University, 310058, Hangzhou, Zhejiang, China.
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Prabhu SA, Wagenknecht M, Melvin P, Gnanesh Kumar BS, Veena M, Shailasree S, Moerschbacher BM, Kini KR. Immuno-affinity purification of PglPGIP1, a polygalacturonase-inhibitor protein from pearl millet: studies on its inhibition of fungal polygalacturonases and role in resistance against the downy mildew pathogen. Mol Biol Rep 2015; 42:1123-38. [PMID: 25596722 DOI: 10.1007/s11033-015-3850-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2014] [Accepted: 01/09/2015] [Indexed: 11/30/2022]
Abstract
Polygalacturonase-inhibitor proteins (PGIPs) are important plant defense proteins which modulate the activity of microbial polygalacturonases (PGs) leading to elicitor accumulation. Very few studies have been carried out towards understanding the role of PGIPs in monocot host defense. Hence, present study was taken up to characterize a native PGIP from pearl millet and understand its role in resistance against downy mildew. A native glycosylated PGIP (PglPGIP1) of ~43 kDa and pI 5.9 was immunopurified from pearl millet. Comparative inhibition studies involving PglPGIP1 and its non-glycosylated form (rPglPGIP1; recombinant pearl millet PGIP produced in Escherichia coli) against two PGs, PG-II isoform from Aspergillus niger (AnPGII) and PG-III isoform from Fusarium moniliforme, showed both PGIPs to inhibit only AnPGII. The protein glycosylation was found to impact only the pH and temperature stability of PGIP, with the native form showing relatively higher stability to pH and temperature changes. Temporal accumulation of both PglPGIP1 protein (western blot and ELISA) and transcripts (real time PCR) in resistant and susceptible pearl millet cultivars showed significant Sclerospora graminicola-induced accumulation only in the incompatible interaction. Further, confocal PGIP immunolocalization results showed a very intense immuno-decoration with highest fluorescent intensities observed at the outer epidermal layer and vascular bundles in resistant cultivar only. This is the first native PGIP isolated from millets and the results indicate a role for PglPGIP1 in host defense. This could further be exploited in devising pearl millet cultivars with better pathogen resistance.
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Affiliation(s)
- Sreedhara Ashok Prabhu
- Department of Studies in Biotechnology, University of Mysore, Manasagangotri, Mysore, 570 006, Karnataka, India
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Single-nucleotide polymorphism markers from de-novo assembly of the pomegranate transcriptome reveal germplasm genetic diversity. PLoS One 2014; 9:e88998. [PMID: 24558460 PMCID: PMC3928336 DOI: 10.1371/journal.pone.0088998] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 01/10/2014] [Indexed: 12/31/2022] Open
Abstract
Pomegranate is a valuable crop that is grown commercially in many parts of the world. Wild species have been reported from India, Turkmenistan and Socotra. Pomegranate fruit has a variety of health-beneficial qualities. However, despite this crop's importance, only moderate effort has been invested in studying its biochemical or physiological properties or in establishing genomic and genetic infrastructures. In this study, we reconstructed a transcriptome from two phenotypically different accessions using 454-GS-FLX Titanium technology. These data were used to explore the functional annotation of 45,187 fully annotated contigs. We further compiled a genetic-variation resource of 7,155 simple-sequence repeats (SSRs) and 6,500 single-nucleotide polymorphisms (SNPs). A subset of 480 SNPs was sampled to investigate the genetic structure of the broad pomegranate germplasm collection at the Agricultural Research Organization (ARO), which includes accessions from different geographical areas worldwide. This subset of SNPs was found to be polymorphic, with 10.7% loci with minor allele frequencies of (MAF<0.05). These SNPs were successfully used to classify the ARO pomegranate collection into two major groups of accessions: one from India, China and Iran, composed of mainly unknown country origin and which was more of an admixture than the other major group, composed of accessions mainly from the Mediterranean basin, Central Asia and California. This study establishes a high-throughput transcriptome and genetic-marker infrastructure. Moreover, it sheds new light on the genetic interrelations between pomegranate species worldwide and more accurately defines their genetic nature.
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Association analysis of SSR markers with phenology, grain, and Stover-yield related traits in pearl millet (Pennisetum glaucum (L.) R. Br.). ScientificWorldJournal 2014; 2014:562327. [PMID: 24526909 PMCID: PMC3910278 DOI: 10.1155/2014/562327] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Accepted: 09/23/2013] [Indexed: 11/18/2022] Open
Abstract
Pearl millet is a staple food crop for millions of people living in the arid and semi-arid tropics. Molecular markers have been used to identify genomic regions linked to traits of interest by conventional QTL mapping and association analysis. Phenotypic recurrent selection is known to increase frequencies of favorable alleles and decrease those unfavorable for the traits under selection. This study was undertaken (i) to quantify the response to recurrent selection for phenotypic traits during breeding of the pearl millet open-pollinated cultivar “CO (Cu) 9” and its four immediate progenitor populations and (ii) to assess the ability of simple sequence repeat (SSR) marker alleles to identify genomic regions linked to grain and stover yield-related traits in these populations by association analysis. A total of 159 SSR alleles were detected across 34 selected single-copy SSR loci. SSR marker data revealed presence of subpopulations. Association analysis identified genomic regions associated with flowering time located on linkage group (LG) 6 and plant height on LG4, LG6, and LG7. Marker alleles on LG6 were associated with stover yield, and those on LG7 were associated with grain yield. Findings of this study would give an opportunity to develop marker-assisted recurrent selection (MARS) or marker-assisted population improvement (MAPI) strategies to increase the rate of gain for pearl millet populations undergoing recurrent selection.
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Satovic Z, Avila CM, Cruz-Izquierdo S, Díaz-Ruíz R, García-Ruíz GM, Palomino C, Gutiérrez N, Vitale S, Ocaña-Moral S, Gutiérrez MV, Cubero JI, Torres AM. A reference consensus genetic map for molecular markers and economically important traits in faba bean (Vicia faba L.). BMC Genomics 2013; 14:932. [PMID: 24377374 PMCID: PMC3880837 DOI: 10.1186/1471-2164-14-932] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Accepted: 12/12/2013] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Faba bean (Vicia faba L.) is among the earliest domesticated crops from the Near East. Today this legume is a key protein feed and food worldwide and continues to serve an important role in culinary traditions throughout Middle East, Mediterranean region, China and Ethiopia. Adapted to a wide range of soil types, the main faba bean breeding objectives are to improve yield, resistance to biotic and abiotic stresses, seed quality and other agronomic traits. Genomic approaches aimed at enhancing faba bean breeding programs require high-quality genetic linkage maps to facilitate quantitative trait locus analysis and gene tagging for use in a marker-assisted selection. The objective of this study was to construct a reference consensus map in faba bean by joining the information from the most relevant maps reported so far in this crop. RESULTS A combination of two approaches, increasing the number of anchor loci in diverse mapping populations and joining the corresponding genetic maps, was used to develop a reference consensus map in faba bean. The map was constructed from three main recombinant inbreed populations derived from four parental lines, incorporates 729 markers and is based on 69 common loci. It spans 4,602 cM with a range from 323 to 1041 loci in six main linkage groups or chromosomes, and an average marker density of one locus every 6 cM. Locus order is generally well maintained between the consensus map and the individual maps. CONCLUSION We have constructed a reliable and fairly dense consensus genetic linkage map that will serve as a basis for genomic approaches in faba bean research and breeding. The core map contains a larger number of markers than any previous individual map, covers existing gaps and achieves a wider coverage of the large faba bean genome as a whole. This tool can be used as a reference resource for studies in different genetic backgrounds, and provides a framework for transferring genetic information when using different marker technologies. Combined with syntenic approaches, the consensus map will increase marker density in selected genomic regions and will be useful for future faba bean molecular breeding applications.
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Affiliation(s)
- Zlatko Satovic
- IFAPA, Centro Alameda del Obispo, Área de Mejora y Biotecnología, Avda. Menéndez Pidal s/n, Apdo. 3092, Córdoba 14080, Spain
- Present addresses: Department of Seed Science and Technology, Faculty of Agriculture, University of Zagreb, Zagreb, Croatia
| | - Carmen M Avila
- IFAPA, Centro Alameda del Obispo, Área de Mejora y Biotecnología, Avda. Menéndez Pidal s/n, Apdo. 3092, Córdoba 14080, Spain
| | - Serafin Cruz-Izquierdo
- IFAPA, Centro Alameda del Obispo, Área de Mejora y Biotecnología, Avda. Menéndez Pidal s/n, Apdo. 3092, Córdoba 14080, Spain
- Colegio de Postgraduados, Recursos Genéticos y Productividad – Genética, Campus Montecillo, Km 36.5 Carretera México-Texcoco, C.P., Texcoco, Edo. de México 56230, México
| | - Ramón Díaz-Ruíz
- IFAPA, Centro Alameda del Obispo, Área de Mejora y Biotecnología, Avda. Menéndez Pidal s/n, Apdo. 3092, Córdoba 14080, Spain
- Colegio de Postgraduados, Campus Puebla, Km 125.5 Carretera México-Puebla, C.P., Puebla, Pue 72760, México
| | - Gloria M García-Ruíz
- IFAPA, Centro Alameda del Obispo, Área de Mejora y Biotecnología, Avda. Menéndez Pidal s/n, Apdo. 3092, Córdoba 14080, Spain
| | - Carmen Palomino
- IFAPA, Centro Alameda del Obispo, Área de Mejora y Biotecnología, Avda. Menéndez Pidal s/n, Apdo. 3092, Córdoba 14080, Spain
| | - Natalia Gutiérrez
- IFAPA, Centro Alameda del Obispo, Área de Mejora y Biotecnología, Avda. Menéndez Pidal s/n, Apdo. 3092, Córdoba 14080, Spain
| | - Stefania Vitale
- IFAPA, Centro Alameda del Obispo, Área de Mejora y Biotecnología, Avda. Menéndez Pidal s/n, Apdo. 3092, Córdoba 14080, Spain
| | - Sara Ocaña-Moral
- IFAPA, Centro Alameda del Obispo, Área de Mejora y Biotecnología, Avda. Menéndez Pidal s/n, Apdo. 3092, Córdoba 14080, Spain
| | - María Victoria Gutiérrez
- IFAPA, Centro Alameda del Obispo, Área de Mejora y Biotecnología, Avda. Menéndez Pidal s/n, Apdo. 3092, Córdoba 14080, Spain
| | - José I Cubero
- Departamento de Mejora Genética, IAS-CSIC, Apdo. 4084, Córdoba 14080, Spain
| | - Ana M Torres
- IFAPA, Centro Alameda del Obispo, Área de Mejora y Biotecnología, Avda. Menéndez Pidal s/n, Apdo. 3092, Córdoba 14080, Spain
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