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Osakina A, Jia Y. Genetic Diversity of Weedy Rice and Its Potential Application as a Novel Source of Disease Resistance. PLANTS (BASEL, SWITZERLAND) 2023; 12:2850. [PMID: 37571004 PMCID: PMC10421194 DOI: 10.3390/plants12152850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 07/13/2023] [Accepted: 07/28/2023] [Indexed: 08/13/2023]
Abstract
Weeds that infest crops are a primary factor limiting agricultural productivity worldwide. Weedy rice, also called red rice, has experienced independent evolutionary events through gene flow from wild rice relatives and de-domestication from cultivated rice. Each evolutionary event supplied/equipped weedy rice with competitive abilities that allowed it to thrive with cultivated rice and severely reduce yields in rice fields. Understanding how competitiveness evolves is important not only for noxious agricultural weed management but also for the transfer of weedy rice traits to cultivated rice. Molecular studies of weedy rice using simple sequence repeat (SSR), restriction fragment length polymorphism (RFLP), and whole-genome sequence have shown great genetic variations in weedy rice populations globally. These variations are evident both at the whole-genome and at the single-allele level, including Sh4 (shattering), Hd1 (heading and flowering), and Rc (pericarp pigmentation). The goal of this review is to describe the genetic diversity of current weedy rice germplasm and the significance of weedy rice germplasm as a novel source of disease resistance. Understanding these variations, especially at an allelic level, is also crucial as individual loci that control important traits can be of great target to rice breeders.
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Affiliation(s)
- Aron Osakina
- Department of Biology, Washington University in St. Louis, St. Louis, MO 63130, USA;
- USDA ARS Dale Bumpers National Rice Research Center, Stuttgart, AR 72160, USA
| | - Yulin Jia
- USDA ARS Dale Bumpers National Rice Research Center, Stuttgart, AR 72160, USA
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Wu Y, Sun J, Yu P, Zhang W, Lin Y, Ma D. The rhizosphere bacterial community contributes to the nutritional competitive advantage of weedy rice over cultivated rice in paddy soil. BMC Microbiol 2022; 22:232. [PMID: 36180838 PMCID: PMC9523940 DOI: 10.1186/s12866-022-02648-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Accepted: 09/22/2022] [Indexed: 11/18/2022] Open
Abstract
Background Weedy rice competes for nutrients and living space with cultivated rice, which results in serious reductions in rice production. The rhizosphere bacterial community plays an important role in nutrient competition between species. It is therefore important to clarify the differences in the diversities of the inter rhizosphere bacterial community between cultivated rice and weedy rice. The differences in compositions and co-occurrence networks of the rhizosphere bacterial community of cultivated rice and weedy rice are largely unknown and thus the aim of our study. Results In our study, the different rhizosphere bacterial community structures in weedy rice (AW), cultivated rice (AY) and cultivated rice surrounded by weedy rice (WY) were determined based on 16S rRNA gene sequencing. The majority of the WY rhizosphere was enriched with unique types of microorganisms belonging to Burkholderia. The rhizosphere bacterial community showed differences in relative abundance among the three groups. Network analysis revealed a more complex co-occurrence network structure in the rhizosphere bacterial community of AW than in those of AY and WY due to a higher degree of Microbacteriaceae and Micrococcaceae in the network. Both network analysis and functional predictions reveal that weedy rice contamination dramatically impacts the iron respiration of the rhizosphere bacterial community of cultivated rice. Conclusions Our study shows that there are many differences in the rhizosphere bacterial community of weedy rice and cultivated rice. When cultivated rice was disturbed by weedy rice, the rhizosphere bacterial community and co-occurrence network also changed. The above differences tend to lead to a nutritional competitive advantage for weedy rice in paddy soils. Supplementary Information The online version contains supplementary material available at 10.1186/s12866-022-02648-1.
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Affiliation(s)
- Yue Wu
- Rice Research Institute, Shenyang Agricultural University, Shenyang, China
| | - Jian Sun
- Rice Research Institute, Shenyang Agricultural University, Shenyang, China
| | - Pengcheng Yu
- Rice Research Institute, Shenyang Agricultural University, Shenyang, China
| | - Weiliang Zhang
- Rice Research Institute, Shenyang Agricultural University, Shenyang, China
| | - Youze Lin
- Rice Research Institute, Shenyang Agricultural University, Shenyang, China
| | - Dianrong Ma
- Rice Research Institute, Shenyang Agricultural University, Shenyang, China.
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Li F, Han Z, Qiao W, Wang J, Song Y, Cui Y, Li J, Ge J, Lou D, Fan W, Li D, Nong B, Zhang Z, Cheng Y, Zhang L, Zheng X, Yang Q. High-Quality Genomes and High-Density Genetic Map Facilitate the Identification of Genes From a Weedy Rice. FRONTIERS IN PLANT SCIENCE 2021; 12:775051. [PMID: 34868173 PMCID: PMC8639688 DOI: 10.3389/fpls.2021.775051] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 10/27/2021] [Indexed: 06/13/2023]
Abstract
Genes have been lost or weakened from cultivated rice during rice domestication and breeding. Weedy rice (Oryza sativa f. spontanea) is usually recognized as the progeny between cultivated rice and wild rice and is also known to harbor an gene pool for rice breeding. Therefore, identifying genes from weedy rice germplasms is an important way to break the bottleneck of rice breeding. To discover genes from weedy rice germplasms, we constructed a genetic map based on w-hole-genome sequencing of a F2 population derived from the cross between LM8 and a cultivated rice variety. We further identified 31 QTLs associated with 12 important agronomic traits and revealed that ORUFILM03g000095 gene may play an important role in grain length regulation and participate in grain formation. To clarify the genomic characteristics from weedy rice germplasms of LM8, we generated a high-quality genome assembly using single-molecule sequencing, Bionano optical mapping, and Hi-C technologies. The genome harbored a total size of 375.8 Mb, a scaffold N50 of 24.1 Mb, and originated approximately 0.32 million years ago (Mya) and was more closely related to Oryza sativa ssp. japonica. and contained 672 unique genes. It is related to the formation of grain shape, heading date and tillering. This study generated a high-quality reference genome of weedy rice and high-density genetic map that would benefit the analysis of genome evolution for related species and suggested an effective way to identify genes related to important agronomic traits for further rice breeding.
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Affiliation(s)
- Fei Li
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Zhenyun Han
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Weihua Qiao
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Junrui Wang
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
- Guangxi Key Laboratory for Polysaccharide Materials and Modifications, School of Marine Sciences and Biotechnology, Guangxi University for Nationalities, Nanning, China
| | - Yue Song
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Yongxia Cui
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
- School of Clinical Medicine, Southwest Medical University, Luzhou, China
| | - Jiaqi Li
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
- Little Berry Research Room, Liaoning Institute of Fruit Science, Yingkou, China
| | - Jinyue Ge
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Danjing Lou
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Weiya Fan
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Danting Li
- Guangxi Key Laboratory of Rice Genetics and Breeding, Rice Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Baoxuan Nong
- Guangxi Key Laboratory of Rice Genetics and Breeding, Rice Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Zongqiong Zhang
- Guangxi Key Laboratory of Rice Genetics and Breeding, Rice Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, China
| | - Yunlian Cheng
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Lifang Zhang
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Xiaoming Zheng
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
| | - Qingwen Yang
- National Key Facility for Crop Gene Resources and Genetic Improvement, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, China
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Zhao C, Xu W, Li H, Dai W, Zhang Z, Qiang S, Song X. The Rapid Cytological Process of Grain Determines Early Maturity in Weedy Rice. FRONTIERS IN PLANT SCIENCE 2021; 12:711321. [PMID: 34531884 PMCID: PMC8438156 DOI: 10.3389/fpls.2021.711321] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Accepted: 08/09/2021] [Indexed: 06/13/2023]
Abstract
Shorter grain-filling period and rapid endosperm development endow weedy rice (WR) with early maturity compared to cultivated rice (CR). However, the role of the cytological features and antioxidative enzyme system during grain development are largely unexplored. We selected four biotypes of WR and their associated cultivated rice (ACR) types from different latitudes to conduct a common garden experiment. The difference in the cytological features of endosperm between WR and ACR was compared by chemical staining, and the cell viability and nuclear morphometry of endosperm cells were observed by optical microscopy. Furthermore, antioxidative enzyme activity was measured during grain filling. Anatomic observation of endosperm shows that the development process of endosperm cell in WR was more rapid and earlier than that in ACR. The percentage of degraded nuclei of WR was 2-83% more than that of ACR. Endosperm cells in WR lost viability 2-6 days earlier than those in ACR. The antioxidant enzyme activity of WR was lower than that of ACR during grain filling. The ability of WR to scavenge reactive oxygen species (ROS) was weaker than that of ACR, which may contribute to the rapid cytological process in the endosperm cells of WR. The rapid cytological process and weaker ability to scavenge ROS in endosperm cells may contribute to early maturity in WR.
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Buffon G, Blasi ÉADR, Lamb TI, Adamski JM, Schwambach J, Ricachenevsky FK, Bertolazi A, Silveira V, Lopes MCB, Sperotto RA. Oryza sativa cv. Nipponbare and Oryza barthii as Unexpected Tolerance and Susceptibility Sources Against Schizotetranychus oryzae (Acari: Tetranychidae) Mite Infestation. FRONTIERS IN PLANT SCIENCE 2021; 12:613568. [PMID: 33643348 PMCID: PMC7902502 DOI: 10.3389/fpls.2021.613568] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Accepted: 01/21/2021] [Indexed: 06/12/2023]
Abstract
Cultivated rice (Oryza sativa L.) is frequently exposed to multiple stresses, including Schizotetranychus oryzae mite infestation. Rice domestication has narrowed the genetic diversity of the species, leading to a wide susceptibility. This work aimed to analyze the response of two African rice species (Oryza barthii and Oryza glaberrima), weedy rice (O. sativa f. spontanea), and O. sativa cv. Nipponbare to S. oryzae infestation. Surprisingly, leaf damage, histochemistry, and chlorophyll concentration/fluorescence indicated that the African species present a higher level of leaf damage, increased accumulation of H2O2, and lower photosynthetic capacity when compared to O. sativa plants under infested conditions. Infestation decreased tiller number, except in Nipponbare, and caused the death of O. barthii and O. glaberrima plants during the reproductive stage. While infestation did not affect the weight of 1,000 grains in both O. sativa, the number of panicles per plant was affected only in O. sativa f. spontanea, and the percentage of full seeds per panicle and seed length were increased only in Nipponbare. Using proteomic analysis, we identified 195 differentially abundant proteins when comparing susceptible (O. barthii) and tolerant (Nipponbare) plants under control and infested conditions. O. barthii presents a less abundant antioxidant arsenal and is unable to modulate proteins involved in general metabolism and energy production under infested condition. Nipponbare presents high abundance of detoxification-related proteins, general metabolic processes, and energy production, suggesting that the primary metabolism is maintained more active compared to O. barthii under infested condition. Also, under infested conditions, Nipponbare presents higher levels of proline and a greater abundance of defense-related proteins, such as osmotin, ricin B-like lectin, and protease inhibitors (PIs). These differentially abundant proteins can be used as biotechnological tools in breeding programs aiming at increased tolerance to mite infestation.
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Affiliation(s)
- Giseli Buffon
- Graduate Program in Biotechnology, University of Taquari Valley-Univates, Lajeado, Brazil
| | | | - Thainá Inês Lamb
- Biological Sciences and Health Center, University of Taquari Valley-Univates, Lajeado, Brazil
| | - Janete Mariza Adamski
- Graduate Program in Botany, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Joséli Schwambach
- Graduate Program in Biotechnology, University of Caxias do Sul, Caxias do Sul, Brazil
| | - Felipe Klein Ricachenevsky
- Graduate Program in Molecular and Cellular Biology, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Amanda Bertolazi
- Laboratory of Biotechnology, Bioscience and Biotechnology Center, State University of Northern Rio de Janeiro Darcy Ribeiro, Campos dos Goytacazes, Brazil
| | - Vanildo Silveira
- Laboratory of Biotechnology, Bioscience and Biotechnology Center, State University of Northern Rio de Janeiro Darcy Ribeiro, Campos dos Goytacazes, Brazil
| | | | - Raul Antonio Sperotto
- Graduate Program in Biotechnology, University of Taquari Valley-Univates, Lajeado, Brazil
- Biological Sciences and Health Center, University of Taquari Valley-Univates, Lajeado, Brazil
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Yan Y, Chao J, Wang Y, Mo S, Kong M, Shi Z, Song X, Qiang S, Dai W.
WA
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gene indicates booming outcrossing progenies (three‐line hybrid rice × weedy rice) in weedy rice populations. Ecosphere 2019. [DOI: 10.1002/ecs2.2646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Affiliation(s)
- Yu‐jiang Yan
- Weed Research Laboratory Nanjing Agricultural University Nanjing 210095 Jiangsu Province China
| | - Jing Chao
- Weed Research Laboratory Nanjing Agricultural University Nanjing 210095 Jiangsu Province China
| | - Yuan Wang
- Weed Research Laboratory Nanjing Agricultural University Nanjing 210095 Jiangsu Province China
| | - Shu‐da Mo
- Weed Research Laboratory Nanjing Agricultural University Nanjing 210095 Jiangsu Province China
| | - Meng‐yao Kong
- Weed Research Laboratory Nanjing Agricultural University Nanjing 210095 Jiangsu Province China
| | - Zhi‐hua Shi
- Weed Research Laboratory Nanjing Agricultural University Nanjing 210095 Jiangsu Province China
| | - Xiao‐ling Song
- Weed Research Laboratory Nanjing Agricultural University Nanjing 210095 Jiangsu Province China
| | - Sheng Qiang
- Weed Research Laboratory Nanjing Agricultural University Nanjing 210095 Jiangsu Province China
| | - Wei‐min Dai
- Weed Research Laboratory Nanjing Agricultural University Nanjing 210095 Jiangsu Province China
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7
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Zhang Y, Fang J, Wu X, Dong L. Na +/K + Balance and Transport Regulatory Mechanisms in Weedy and Cultivated Rice (Oryza sativa L.) Under Salt Stress. BMC PLANT BIOLOGY 2018; 18:375. [PMID: 30594151 PMCID: PMC6311050 DOI: 10.1186/s12870-018-1586-9] [Citation(s) in RCA: 65] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Accepted: 12/03/2018] [Indexed: 05/20/2023]
Abstract
BACKGROUND Salinization is a primary abiotic stress constraining global plant growth and production. Weedy rice, though highly homologous to cultivated rice, is more salt tolerant during seed germination and seedling growth; we hypothesize that this is owing to ionic homeostasis and changes in the expression of genes encoding ion transport regulators. RESULTS The four different genotypes of weedy (JYGY-1 and JYFN-4) and cultivated (Nipponbare and 9311) rice have different salt-tolerance during seed germination and seedling vegetative growth under salt stress. In this study, Na+ and Ca2+content increased in weedy and cultivated rice genotypes under salt stress while K+ and Mg2+decreased; however, JYGY-1 had the lowest Na+/K+ ratio of assessed genotypes. Genes in the high-affinity K+ transporter (HKT) and tonoplast sodium-hydrogen exchanger (NHX) families, and salt overly sensitive 1 (OsSOS1) have more than 98% homology in amino acid sequences between weedy and cultivated rice genotypes. Under salt stress, the HKT family members were differentially expressed in the roots and shoots of four different genotypes. However, the NHX family transcripts were markedly up-regulated in all genotypes, but there are significant differences between different genotypes. OsSOS1 was significantly up-regulated in roots, especially in JYGY-1genotype. CONCLUSIONS The results showed that different genotypes had different germination and nutrient survival under salt stress, which was related to the difference of ion content and the difference of a series of ion transport gene expression. At the same time this study will provide new insight into the similarities and differences in ion homeostasis and gene regulatory mechanisms between weedy and cultivated rice under salt stress, which can aid in novel rice breeding and growth strategies.
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Affiliation(s)
- Yuhua Zhang
- College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China
- Key Laboratory of Integrated Pest Management on Crops in East China, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, 210095, China
| | - Jiapeng Fang
- College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China
- Key Laboratory of Integrated Pest Management on Crops in East China, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, 210095, China
| | - Xibao Wu
- College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China
- Key Laboratory of Integrated Pest Management on Crops in East China, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, 210095, China
| | - Liyao Dong
- College of Plant Protection, Nanjing Agricultural University, Nanjing, 210095, China.
- Key Laboratory of Integrated Pest Management on Crops in East China, Ministry of Agriculture, Nanjing Agricultural University, Nanjing, 210095, China.
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8
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Kanapeckas KL, Tseng TM, Vigueira CC, Ortiz A, Bridges WC, Burgos NR, Fischer AJ, Lawton-Rauh A. Contrasting patterns of variation in weedy traits and unique crop features in divergent populations of US weedy rice (Oryza sativa sp.) in Arkansas and California. PEST MANAGEMENT SCIENCE 2018; 74:1404-1415. [PMID: 29205860 DOI: 10.1002/ps.4820] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 11/29/2017] [Accepted: 11/29/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND Weed evolution from crops involves changes in key traits, but it is unclear how genetic and phenotypic variation contribute to weed diversification and productivity. Weedy rice is a conspecific weed of rice (Oryza sativa) worldwide. We used principal component analysis and hierarchical clustering to understand how morphologically and evolutionarily distinct US weedy rice populations persist in rice fields in different locations under contrasting management regimes. Further, we used a representative subset of 15 sequence-tagged site fragments of expressed genes from global Oryza to assess genome-wide sequence variation among populations. RESULTS Crop hull color and crop-overlapping maturity dates plus awns, seed (panicle) shattering (> 50%), pigmented pericarp and stature variation (30.2% of total phenotypic variance) characterize genetically less diverse California weedy rice. By contrast, wild-like hull color, seed shattering (> 50%) and stature differences (55.8% of total phenotypic variance) typify genetically diverse weedy rice ecotypes in Arkansas. CONCLUSION Recent de-domestication of weedy species - such as in California weedy rice - can involve trait combinations indistinguishable from the crop. This underscores the need for strict seed certification with genetic monitoring and proactive field inspection to prevent proliferation of weedy plant types. In established populations, tillage practice may affect weed diversity and persistence over time. © 2017 Society of Chemical Industry.
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Affiliation(s)
- Kimberly L Kanapeckas
- South Carolina Department of Natural Resources Marine Resources Research Institute and College of Charleston, Hollings Marine Laboratory, Charleston, SC, USA
| | - Te-Ming Tseng
- Department of Plant and Soil Sciences, Mississippi State University, MS, USA
| | | | - Aida Ortiz
- Facultad de Agronomía, Universidad Central de Venezuela Maracay, Aragua, Venezuela
| | - William C Bridges
- Department of Mathematical Sciences, Clemson University, Clemson, SC, USA
| | - Nilda R Burgos
- Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, AR, USA
| | - Albert J Fischer
- Department of Plant Sciences, University of California, Davis, CA, USA
| | - Amy Lawton-Rauh
- Department of Genetics and Biochemistry, Clemson University, Clemson, SC, USA
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9
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Zhao C, Xu W, Song X, Dai W, Dai L, Zhang Z, Qiang S. Early flowering and rapid grain filling determine early maturity and escape from harvesting in weedy rice. PEST MANAGEMENT SCIENCE 2018; 74:465-476. [PMID: 28902454 DOI: 10.1002/ps.4730] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Revised: 08/25/2017] [Accepted: 09/08/2017] [Indexed: 06/07/2023]
Abstract
BACKGROUND Early maturity is an important trait that is essential to the survival of weedy rice. To explore the mechanism of early maturity in weedy rice, the reproductive development of a large sample of weedy rice accessions and cultivars was compared in a common garden study. A selected sample of both weedy and cultivated rice was sown at different dates in two years to study in more detail their flowering and grain-filling patterns. RESULTS The weedy rice from three major cropping regions matured 7-8 days earlier than their associated cultivars. Representative weedy rice accessions planted on conventional sowing dates flowered 3-26 days earlier than cultivars; delayed sowing caused divergence in the flowering regimes in weedy rice. However, regardless of the sowing date, weedy rice filled its grain 7-21 days faster than cultivars in both study years. Vegetative and reproductive traits of weedy and cultivated rice have different patterns of variation with delayed planting. CONCLUSION Early maturity is an essential factor determining the persistence of weedy rice by contributing to the escape of its seed from being harvested with the rice crop. Both early flowering and shorter grain-filling stages determine early maturity, and flowering is more plastic than grain filling. © 2017 Society of Chemical Industry.
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Affiliation(s)
- Can Zhao
- Weed Research Laboratory, Nanjing Agricultural University, Nanjing, P. R. China
| | - Wenrong Xu
- Weed Research Laboratory, Nanjing Agricultural University, Nanjing, P. R. China
| | - Xiaoling Song
- Weed Research Laboratory, Nanjing Agricultural University, Nanjing, P. R. China
| | - Weimin Dai
- Weed Research Laboratory, Nanjing Agricultural University, Nanjing, P. R. China
| | - Lei Dai
- Weed Research Laboratory, Nanjing Agricultural University, Nanjing, P. R. China
- College of Life Science and Technology, Henan Institute Science and Technology, Xinxiang, P. R. China
| | - Zheng Zhang
- Weed Research Laboratory, Nanjing Agricultural University, Nanjing, P. R. China
| | - Sheng Qiang
- Weed Research Laboratory, Nanjing Agricultural University, Nanjing, P. R. China
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10
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Dai L, Song X, He B, Valverde BE, Qiang S. Enhanced photosynthesis endows seedling growth vigour contributing to the competitive dominance of weedy rice over cultivated rice. PEST MANAGEMENT SCIENCE 2017; 73:1410-1420. [PMID: 27790812 DOI: 10.1002/ps.4471] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 07/20/2016] [Accepted: 10/25/2016] [Indexed: 06/06/2023]
Abstract
BACKGROUND Weedy rice, as one of the worst paddy field weeds worldwide, bears vigorous seedlings and dominantly competes with cultivated rice causing serious crop yield losses. To elucidate the causes of its stronger seedling vigour endowing its dominant competition with cultivated rice, comparative studies on seedling growth characteristics were conducted among six weedy rice biotypes and the two indica and japonica cultivars Shanyou-63 (SY-63) and Zhendao-8 (ZD-8), respectively, in the greenhouse. RESULTS Weedy rice emerged 2 to 3 days earlier, rapidly grew 1.3-1.7 cm taller daily, produced more secondary adventitious roots and greater aboveground fresh biomass than cultivated rice. Moreover, weedy rice exhibited greater photosynthetic pigment content, net photosynthetic rate, stomatal conductance, intercellular CO2 concentration, transpiration rate, and chlorophyll fluorescence kinetic parameters. An enhanced overall photosynthetic activity in weedy rices was attributed to the combined action of a larger antenna, more active reaction centres and higher quantum yield for electron transfer beyond QA . CONCLUSIONS Enhanced photosynthesis of weedy rice at the seedling stage should be the main factor for leading to strong competitive dominance over cultivated rice. © 2016 Society of Chemical Industry.
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Affiliation(s)
- Lei Dai
- Weed Research Laboratory, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, P.R. China
- College of Life Science and Technology, Henan Institute Science and Technology, Xinxiang, 453003, Henan, P.R. China
| | - Xiaoling Song
- Weed Research Laboratory, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, P.R. China
| | - Baoye He
- Weed Research Laboratory, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, P.R. China
| | - Bernal E Valverde
- Weed Research Laboratory, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, P.R. China
- Investigación y Desarrollo en Agricultura Tropical, S.A., Tambor, Alajuela, 4050, Costa Rica
| | - Sheng Qiang
- Weed Research Laboratory, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, P.R. China
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11
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He Z, Jiang X, Ratnasekera D, Grassi F, Perera U, Lu BR. Seed-mediated gene flow promotes genetic diversity of weedy rice within populations: implications for weed management. PLoS One 2014; 9:e112778. [PMID: 25436611 PMCID: PMC4249867 DOI: 10.1371/journal.pone.0112778] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2014] [Accepted: 10/17/2014] [Indexed: 11/19/2022] Open
Abstract
Increased infestation of weedy rice-a noxious agricultural pest has caused significant reduction of grain yield of cultivated rice (Oryza sativa) worldwide. Knowledge on genetic diversity and structure of weedy rice populations will facilitate the design of effective methods to control this weed by tracing its origins and dispersal patterns in a given region. To generate such knowledge, we studied genetic diversity and structure of 21 weedy rice populations from Sri Lanka based on 23 selected microsatellite (SSR) loci. Results indicated an exceptionally high level of within-population genetic diversity (He = 0.62) and limited among-population differentiation (Fst = 0.17) for this predominantly self-pollinating weed. UPGMA analysis showed a loose genetic affinity of the weedy rice populations in relation to their geographical locations, and no obvious genetic structure among populations across the country. This phenomenon was associated with the considerable amount of gene flow between populations. Limited admixture from STRUCTURE analyses suggested a very low level of hybridization (pollen-mediated gene flow) between populations. The abundant within-population genetic diversity coupled with limited population genetic structure and differentiation is likely caused by the considerable seed-mediated gene flow of weedy rice along with the long-distance exchange of farmer-saved rice seeds between weedy-rice contaminated regions in Sri Lanka. In addition to other effective weed management strategies, promoting the application of certified rice seeds with no weedy rice contamination should be the immediate action to significantly reduce the proliferation and infestation of this weed in rice ecosystems in countries with similar rice farming styles as in Sri Lanka.
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Affiliation(s)
- Zhuoxian He
- Ministry of Education Key Laboratory for Biodiversity and Ecological Engineering, Department of Ecology and Evolutionary Biology, Fudan University, Shanghai, China
| | - Xiaoqi Jiang
- Ministry of Education Key Laboratory for Biodiversity and Ecological Engineering, Department of Ecology and Evolutionary Biology, Fudan University, Shanghai, China
| | - Disna Ratnasekera
- Department of Agricultural Biology, Faculty of Agriculture, University of Ruhuna, Matara, Sri Lanka
| | - Fabrizio Grassi
- Botanical Garden, Department of Biology, University of Bari, Bari, Italy
- Department of Bioscience, University of Milan, Milano, Italy
| | - Udugahapattuwage Perera
- Department of Agricultural Biology, Faculty of Agriculture, University of Ruhuna, Matara, Sri Lanka
| | - Bao-Rong Lu
- Ministry of Education Key Laboratory for Biodiversity and Ecological Engineering, Department of Ecology and Evolutionary Biology, Fudan University, Shanghai, China
- * E-mail:
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