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Bohle F, Klaus A, Ingelfinger J, Tegethof H, Safari N, Schwarzländer M, Hochholdinger F, Hahn M, Meyer AJ, Acosta IF, Müller-Schüssele SJ. Contrasting cytosolic glutathione redox dynamics under abiotic and biotic stress in barley as revealed by the biosensor Grx1-roGFP2. JOURNAL OF EXPERIMENTAL BOTANY 2024; 75:2299-2312. [PMID: 38301663 DOI: 10.1093/jxb/erae035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Accepted: 01/29/2024] [Indexed: 02/03/2024]
Abstract
Barley is a staple crop of major global importance and relatively resilient to a wide range of stress factors in the field. Transgenic reporter lines to investigate physiological parameters during stress treatments remain scarce. We generated and characterized transgenic homozygous barley lines (cv. Golden Promise Fast) expressing the genetically encoded biosensor Grx1-roGFP2, which indicates the redox potential of the major antioxidant glutathione in the cytosol. Our results demonstrated functionality of the sensor in living barley plants. We determined the glutathione redox potential (EGSH) of the cytosol to be in the range of -308 mV to -320 mV. EGSH was robust against a combined NaCl (150 mM) and water deficit treatment (-0.8 MPa) but responded with oxidation to infiltration with the phytotoxic secretome of the necrotrophic fungus Botrytis cinerea. The generated reporter lines are a novel resource to study biotic and abiotic stress resilience in barley, pinpointing that even severe abiotic stress leading to a growth delay does not automatically induce cytosolic EGSH oxidation, while necrotrophic pathogens can undermine this robustness.
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Affiliation(s)
- Finja Bohle
- Molecular Botany, Department of Biology, RPTU Kaiserslautern-Landau, D-67633 Kaiserslautern, Germany
- Chemical Signalling, Institute of Crop Science and Resource Conservation (INRES), University of Bonn, D-53113 Bonn, Germany
| | - Alina Klaus
- Crop Functional Genomics, Institute of Crop Science and Resource Conservation (INRES), University of Bonn, D-53113 Bonn, Germany
| | - Julian Ingelfinger
- Molecular Botany, Department of Biology, RPTU Kaiserslautern-Landau, D-67633 Kaiserslautern, Germany
| | - Hendrik Tegethof
- Chemical Signalling, Institute of Crop Science and Resource Conservation (INRES), University of Bonn, D-53113 Bonn, Germany
| | - Nassim Safari
- Phytopathology, Department of Biology, RPTU Kaiserslautern-Landau, D-67633 Kaiserslautern, Germany
| | - Markus Schwarzländer
- Institute of Plant Biology and Biotechnology, University of Münster, D-48143 Münster, Germany
| | - Frank Hochholdinger
- Crop Functional Genomics, Institute of Crop Science and Resource Conservation (INRES), University of Bonn, D-53113 Bonn, Germany
| | - Matthias Hahn
- Phytopathology, Department of Biology, RPTU Kaiserslautern-Landau, D-67633 Kaiserslautern, Germany
| | - Andreas J Meyer
- Chemical Signalling, Institute of Crop Science and Resource Conservation (INRES), University of Bonn, D-53113 Bonn, Germany
| | - Ivan F Acosta
- Max Planck Institute for Plant Breeding Research, D-50829 Cologne, Germany
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Sun SR, Wu XB, Chen JS, Huang MT, Fu HY, Wang QN, Rott P, Gao SJ. Identification of a sugarcane bacilliform virus promoter that is activated by drought stress in plants. Commun Biol 2024; 7:368. [PMID: 38532083 DOI: 10.1038/s42003-024-06075-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Accepted: 03/20/2024] [Indexed: 03/28/2024] Open
Abstract
Sugarcane (Saccharum spp.) is an important sugar and biofuel crop in the world. It is frequently subjected to drought stress, thus causing considerable economic losses. Transgenic technology is an effective breeding approach to improve sugarcane tolerance to drought using drought-inducible promoter(s) to activate drought-resistance gene(s). In this study, six different promoters were cloned from sugarcane bacilliform virus (SCBV) genotypes exhibiting high genetic diversity. In β-glucuronidase (GUS) assays, expression of one of these promoters (PSCBV-YZ2060) is similar to the one driven by the CaMV 35S promoter and >90% higher compared to the other cloned promoters and Ubi1. Three SCBV promoters (PSCBV-YZ2060, PSCBV-TX, and PSCBV-CHN2) function as drought-induced promoters in transgenic Arabidopsis plants. In Arabidopsis, GUS activity driven by promoter PSCBV-YZ2060 is also upregulated by abscisic acid (ABA) and is 2.2-5.5-fold higher when compared to the same activity of two plant native promoters (PScRD29A from sugarcane and PAtRD29A from Arabidopsis). Mutation analysis revealed that a putative promoter region 1 (PPR1) and two ABA response elements (ABREs) are required in promoter PSCBV-YZ2060 to confer drought stress response and ABA induction. Yeast one-hybrid and electrophoretic mobility shift assays uncovered that transcription factors ScbZIP72 from sugarcane and AREB1 from Arabidopsis bind with two ABREs of promoter PSCBV-YZ2060. After ABA treatment or drought stress, the expression levels of endogenous ScbZIP72 and heterologous GUS are significantly increased in PSCBV-YZ2060:GUS transgenic sugarcane plants. Consequently, promoter PSCBV-YZ2060 is a possible alternative promoter for genetic engineering of drought-resistant transgenic crops such as sugarcane.
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Affiliation(s)
- Sheng-Ren Sun
- National Engineering Research Center for Sugarcane, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, China
- Institute of Nanfan & Seed Industry, Guangdong Academy of Sciences, Guangzhou, 510316, Guangdong, China
- Hainan Yazhou Bay Seed Laboratory, Sanya, 572024, Hainan, China
| | - Xiao-Bin Wu
- College of Ocean and Earth Sciences, Xiamen University, Xiamen, 361000, Fujian, China
| | - Jian-Sheng Chen
- College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, China
| | - Mei-Ting Huang
- National Engineering Research Center for Sugarcane, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, China
| | - Hua-Ying Fu
- National Engineering Research Center for Sugarcane, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, China
| | - Qin-Nan Wang
- Institute of Nanfan & Seed Industry, Guangdong Academy of Sciences, Guangzhou, 510316, Guangdong, China
| | - Philippe Rott
- CIRAD, UMR PHIM, 34398, Montpellier, France.
- PHIM Plant Health Institute, Univ Montpellier, CIRAD, INRAE, Institut Agro, IRD, Montpellier, France.
| | - San-Ji Gao
- National Engineering Research Center for Sugarcane, Fujian Agriculture and Forestry University, Fuzhou, 350002, Fujian, China.
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Siddiqui MN, Pandey K, Bhadhury SK, Sadeqi B, Schneider M, Sanchez-Garcia M, Stich B, Schaaf G, Léon J, Ballvora A. Convergently selected NPF2.12 coordinates root growth and nitrogen use efficiency in wheat and barley. THE NEW PHYTOLOGIST 2023; 238:2175-2193. [PMID: 36808608 DOI: 10.1111/nph.18820] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 02/13/2023] [Indexed: 05/04/2023]
Abstract
Understanding the genetic and molecular function of nitrate sensing and acquisition across crop species will accelerate breeding of cultivars with improved nitrogen use efficiency (NUE). Here, we performed a genome-wide scan using wheat and barley accessions characterized under low and high N inputs that uncovered the NPF2.12 gene, encoding a homolog of the Arabidopsis nitrate transceptor NRT1.6 and other low-affinity nitrate transporters that belong to the MAJOR FACILITATOR SUPERFAMILY. Next, it is shown that variations in the NPF2.12 promoter correlated with altered NPF2.12 transcript levels where decreased gene expression was measured under low nitrate availability. Multiple field trials revealed a significantly enhanced N content in leaves and grains and NUE in the presence of the elite allele TaNPF2.12TT grown under low N conditions. Furthermore, the nitrate reductase encoding gene NIA1 was up-regulated in npf2.12 mutant upon low nitrate concentrations, thereby resulting in elevated levels of nitric oxide (NO) production. This increase in NO correlated with the higher root growth, nitrate uptake, and N translocation observed in the mutant when compared to wild-type. The presented data indicate that the elite haplotype alleles of NPF2.12 are convergently selected in wheat and barley that by inactivation indirectly contribute to root growth and NUE by activating NO signaling under low nitrate conditions.
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Affiliation(s)
- Md Nurealam Siddiqui
- Institute of Crop Science and Resource Conservation (INRES)-Plant Breeding, University of Bonn, Katzenburgweg 5, Bonn, D-53115, Germany
- Department of Biochemistry and Molecular Biology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, 1706, Bangladesh
| | - Kailash Pandey
- Institute of Crop Science and Resource Conservation (INRES)-Plant Breeding, University of Bonn, Katzenburgweg 5, Bonn, D-53115, Germany
| | - Suzan Kumer Bhadhury
- Institute of Crop Science and Resource Conservation (INRES)-Plant Breeding, University of Bonn, Katzenburgweg 5, Bonn, D-53115, Germany
| | - Bahman Sadeqi
- Institute of Crop Science and Resource Conservation (INRES)-Plant Breeding, University of Bonn, Katzenburgweg 5, Bonn, D-53115, Germany
| | - Michael Schneider
- Institute for Quantitative Genetics and Genomics of Plants, Heinrich Heine University, Düsseldorf, Germany
| | - Miguel Sanchez-Garcia
- Biodiversity and Crop Improvement Program, International Center for Agricultural Research in the Dry Areas (ICARDA), Rabat, 10101, Morocco
| | - Benjamin Stich
- Department of Biochemistry and Molecular Biology, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, 1706, Bangladesh
- Cluster of Excellence on Plant Sciences (CEPLAS), Heinrich Heine University, Düsseldorf, 40225, Germany
| | - Gabriel Schaaf
- Department of Plant Nutrition, Institute of Crop Science and Resource Conservation (INRES), University of Bonn, Karlrobert-Kreiten-Str. 13, Bonn, D-53115, Germany
| | - Jens Léon
- Institute of Crop Science and Resource Conservation (INRES)-Plant Breeding, University of Bonn, Katzenburgweg 5, Bonn, D-53115, Germany
- Field Lab Campus Klein-Altendorf, University of Bonn, Klein-Altendorf 2, Rheinbach, 53359, Germany
| | - Agim Ballvora
- Institute of Crop Science and Resource Conservation (INRES)-Plant Breeding, University of Bonn, Katzenburgweg 5, Bonn, D-53115, Germany
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Du L, Huang X, Ding L, Wang Z, Tang D, Chen B, Ao L, Liu Y, Kang Z, Mao H. TaERF87 and TaAKS1 synergistically regulate TaP5CS1/TaP5CR1-mediated proline biosynthesis to enhance drought tolerance in wheat. THE NEW PHYTOLOGIST 2023; 237:232-250. [PMID: 36264565 DOI: 10.1111/nph.18549] [Citation(s) in RCA: 21] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Accepted: 10/04/2022] [Indexed: 06/16/2023]
Abstract
Drought stress limits wheat production and threatens food security world-wide. While ethylene-responsive factors (ERFs) are known to regulate plant response to drought stress, the regulatory mechanisms responsible for a tolerant phenotype remain unclear. Here, we describe the positive regulatory role of TaERF87 in mediating wheat tolerance to drought stress. TaERF87 overexpression (OE) enhances drought tolerance, while silencing leads to drought sensitivity in wheat. RNA sequencing with biochemical assays revealed that TaERF87 activates the expression of the proline biosynthesis genes TaP5CS1 and TaP5CR1 via direct binding to GCC-box elements. Furthermore, proline accumulates to higher levels in TaERF87- and TaP5CS1-OE lines than that in wild-type plants under well-watered and drought stress conditions concomitantly with enhanced drought tolerance in these transgenic lines. Moreover, the interaction between TaERF87 and the bHLH transcription factor TaAKS1 synergistically enhances TaP5CS1 and TaP5CR1 transcriptional activation. TaAKS1 OE also increases wheat drought tolerance by promoting proline accumulation. Additionally, our findings verified that TaERF87 and TaAKS1 are targets of abscisic acid-responsive element binding factor 2 (TaABF2). Together, our study elucidates the mechanisms underlying a positive response to drought stress mediated by the TaABF2-TaERF87/TaAKS1-TaP5CS1/TaP5CR1 module, and identifies candidate genes for the development of elite drought-tolerant wheat varieties.
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Affiliation(s)
- Linying Du
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Life Science, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Xueling Huang
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Li Ding
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Zhongxue Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Dongling Tang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Bin Chen
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Lanjiya Ao
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Agronomy, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Yuling Liu
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
| | - Zhensheng Kang
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
- Pioneering Innovation Center for Wheat Stress Tolerance Improvement, State Key Laboratory of Crop Stress Biology for Arid Areas, Yangling, Shaanxi, 712100, China
- Yangling Seed Industry Innovation Center, Yangling, Shaanxi, 712100, China
| | - Hude Mao
- State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University, Yangling, Shaanxi, 712100, China
- Pioneering Innovation Center for Wheat Stress Tolerance Improvement, State Key Laboratory of Crop Stress Biology for Arid Areas, Yangling, Shaanxi, 712100, China
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5
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Shrestha A, Fendel A, Nguyen TH, Adebabay A, Kullik AS, Benndorf J, Leon J, Naz AA. Natural diversity uncovers P5CS1 regulation and its role in drought stress tolerance and yield sustainability in barley. PLANT, CELL & ENVIRONMENT 2022; 45:3523-3536. [PMID: 36130879 DOI: 10.1111/pce.14445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 09/13/2022] [Accepted: 09/17/2022] [Indexed: 06/15/2023]
Abstract
Proline accumulation is one of the major responses of plants to many abiotic stresses. However, the significance of proline accumulation for drought stress tolerance remains enigmatic in crop plants. First, we examined the natural variation of the pyrolline-5-carboxylate synthase (P5CS1) among 49 barley genotypes. Allele mining identified a previously unknown allelic series that showed polymorphisms at 42 cis-elements across the P5CS1 promoter. Selected haplotypes had quantitative variation in P5CS1 gene expression and proline accumulation, putatively influenced by both abscisic acid-dependent and independent pathways under drought stress. Next, we introgressed the P5CS1 allele from a high proline accumulating wild barley accession ISR42-8 into cultivar Scarlett developing a near-isogenic line (NIL-143). NIL-143 accumulated higher proline concentrations than Scarlett under drought stress at seedling and reproductive stages. Under drought stress, NIL-143 showed less pigment damage, sustained photosynthetic health, and higher drought stress recovery compared to Scarlett. Further, the drought-induced damage to yield-related traits, mainly thousand-grain weight, was lower in NIL-143 compared with Scarlett in field conditions. Our data uncovered new variants of the P5CS1 promoter and the significance of the increased proline accumulation regulated by the P5CS1 allele of ISR42-8 in drought stress tolerance and yield stability in barley.
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Affiliation(s)
- Asis Shrestha
- Department of Plant Breeding, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
| | - Alexander Fendel
- Department of Plant Breeding, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
| | - Thuy H Nguyen
- Department of Crop Science, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
| | - Anteneh Adebabay
- Department of Plant Breeding, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
| | - Annika Stina Kullik
- Department of Plant Breeding, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
| | - Jan Benndorf
- Department of Plant Breeding, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
| | - Jens Leon
- Department of Plant Breeding, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
| | - Ali A Naz
- Department of Plant Breeding, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
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6
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Hornbacher J, Horst-Niessen I, Herrfurth C, Feussner I, Papenbrock J. First experimental evidence suggests use of glucobrassicin as source of auxin in drought-stressed Arabidopsis thaliana. FRONTIERS IN PLANT SCIENCE 2022; 13:1025969. [PMID: 36388588 PMCID: PMC9659865 DOI: 10.3389/fpls.2022.1025969] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 10/13/2022] [Indexed: 06/16/2023]
Abstract
The synthesis of indole-3-acetonitrile (IAN) from the indolic glucosinolate (iGSL) glucobrassicin (GB) is a unique trait of members of the Brassicales. To assess the contribution of this pathway to indole-3-acetic acid (IAA) synthesis under stress conditions, drought stress (DS) experiments with Arabidopsis thaliana were performed in vitro. Analysis of GSLs in DS plants revealed higher contents of GB in shoots and roots compared to control plants. Deuterium incorporation experiments showed the highest turnover of GB compared to all other GSLs during drought conditions. Evidence suggests the involvement of the thioglucosidase BGLU18 in the degradation of GB. The nitrile specifier proteins NSP1 and NSP5 are known to direct the GSL hydrolysis towards formation of IAN. Nitrilases like NIT2 are able to subsequently synthesize IAA from IAN. Expression of BGLU18, NSP1, NSP5 and NIT2 and contents of GB, IAN and IAA were significantly elevated in DS plants compared to control plants suggesting the increased use of GB as IAA source. Significantly higher contents of reactive oxygen species in DS bglu18 and epithionitrile specifier protein (esp) mutants compared to Col-0 indicate higher stress levels in these mutants highlighting the need for both proteins in DS plants. Furthermore, GB accumulation in leaves was higher in both mutants during DS when compared to Col-0 indicating enhanced synthesis of GB due to a lack of breakdown products. This work provides the first evidence for the breakdown of iGSLs to IAN which seems to be used for synthesis of IAA in DS A. thaliana plants.
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Affiliation(s)
| | | | - Cornelia Herrfurth
- Albrecht-von-Haller-Institute for Plant Sciences, Department of Plant Biochemistry, University of Göttingen, Göttingen, Germany
- Göttingen Center for Molecular Biosciences (GZMB), Service Unit for Metabolomics and Lipidomics, University of Göttingen, Göttingen, Germany
| | - Ivo Feussner
- Albrecht-von-Haller-Institute for Plant Sciences, Department of Plant Biochemistry, University of Göttingen, Göttingen, Germany
- Göttingen Center for Molecular Biosciences (GZMB), Service Unit for Metabolomics and Lipidomics, University of Göttingen, Göttingen, Germany
- Göttingen Center for Molecular Biosciences (GZMB), Department of Plant Biochemistry, University of Göttingen, Göttingen, Germany
| | - Jutta Papenbrock
- Institute of Botany, Leibniz University Hannover, Hannover, Germany
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7
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Mao H, Li S, Chen B, Jian C, Mei F, Zhang Y, Li F, Chen N, Li T, Du L, Ding L, Wang Z, Cheng X, Wang X, Kang Z. Variation in cis-regulation of a NAC transcription factor contributes to drought tolerance in wheat. MOLECULAR PLANT 2022; 15:276-292. [PMID: 34793983 DOI: 10.1016/j.molp.2021.11.007] [Citation(s) in RCA: 64] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 10/28/2021] [Accepted: 11/11/2021] [Indexed: 06/13/2023]
Abstract
Drought is a major environmental factor limiting wheat production worldwide, and developing drought-tolerant cultivars is a central challenge for wheat breeders globally. Therefore, it is important to identify genetic components determining drought tolerance in wheat. In this study, we identified a wheat NAC gene (TaNAC071-A) that is tightly associated with drought tolerance by a genome-wide association study. Knockdown of TaNAC071-A in wheat attenuated plant drought tolerance, whereas its overexpression significantly enhanced drought tolerance through improved water-use efficiency and increased expression of stress-responsive genes. This heightened water-saving mechanism mitigated the yield loss caused by water deficit. Further candidate gene association analysis showed that a 108-bp insertion in the promoter of TaNAC071-A alters its expression level and contributes to variation in drought tolerance among wheat accessions. This insertion contains two MYB cis-regulatory elements (CREs) that can be directly bound by the MYB transcription activator, TaMYBL1, thereby leading to increased TaNAC071-A expression and plant drought tolerance. Importantly, introgression of this 108-bp insertion allele, TaNAC071-AIn-693, into drought-sensitive cultivars could improve their drought tolerance, demonstrating that it is a valuable genetic resource for wheat breeding. Taken together, our findings highlight a major breakthrough in determining the genetic basis underlying phenotypic variation in wheat drought tolerance and showcase the potential of exploiting CRE-containing indels for improving important agronomical traits.
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Affiliation(s)
- Hude Mao
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China; Pioneering Innovation Center for Wheat Stress Tolerance Improvement, State Key Laboratory of Crop Stress Biology for Arid Areas, Yangling, Shaanxi 712100, China.
| | - Shumin Li
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Bin Chen
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Chao Jian
- Key Laboratory of Crop Gene Resources and Germplasm Enhancement, Ministry of Agriculture, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Fangming Mei
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Yifang Zhang
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Fangfang Li
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Nan Chen
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Tian Li
- Key Laboratory of Crop Gene Resources and Germplasm Enhancement, Ministry of Agriculture, Institute of Crop Science, Chinese Academy of Agricultural Sciences, Beijing 100081, China
| | - Linying Du
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Science, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Li Ding
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Zhongxue Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Xinxiu Cheng
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Xiaojing Wang
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Life Science, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Zhensheng Kang
- State Key Laboratory of Crop Stress Biology for Arid Areas and College of Plant Protection, Northwest A&F University, Yangling, Shaanxi 712100, China; Pioneering Innovation Center for Wheat Stress Tolerance Improvement, State Key Laboratory of Crop Stress Biology for Arid Areas, Yangling, Shaanxi 712100, China; Yangling Seed Industry Innovation Center, Yangling, Shaanxi 712100, China.
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8
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Kaur Dhaliwal L, Gannaban RB, Shrestha A, Shim J, Kaur Mangat P, Singleton JJ, Angeles‐Shim RB. Integrated morpho-biochemical and transcriptome analyses reveal multidimensional response of upland cotton ( Gossypium hirsutum L.) to low temperature stress during seedling establishment. PLANT-ENVIRONMENT INTERACTIONS (HOBOKEN, N.J.) 2021; 2:290-302. [PMID: 37284178 PMCID: PMC10168043 DOI: 10.1002/pei3.10067] [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: 09/02/2021] [Revised: 10/28/2021] [Accepted: 11/04/2021] [Indexed: 06/08/2023]
Abstract
Cotton is a tropical/subtropical crop and is innately susceptible to cold. Using an approach that integrates morphological, biochemical, and transcriptome analyses, the study aimed to understand the molecular underpinnings of phenotypic adjustments in cotton seedlings under cold stress. Exposure of six cotton accessions to 15°C during the seedling stage significantly reduced chlorophyll content, stomatal conductance, plant height, and biomass, but increased malondialdehyde and proline production. Comparative transcriptome profiling of the cold-sensitive accession SA 3781 grown under low and normal temperatures showed the upregulation of genes related to the production of reactive oxygen species (ROS) under cold stress. Despite a similar upregulation of genes encoding metabolites that can scavenge ROS and provide osmoprotection for the cell, the stressed plants still exhibited oxidative stress in terms of lipid peroxidation. This may be due in part to the upregulation of abscisic acid synthesis genes and downregulation of chlorophyll synthesis genes effecting lower stomatal conductance and chlorophyll contents, respectively. Additionally, stomatal closure which is required to avoid the cooling effect and dehydration under cold conditions may have contributed in reducing the net photosynthetic rates in plants exposed to low temperature. These findings provide an insight into the expression of key genes regulating the phenotypic changes observed in cotton in response to cold stress.
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Affiliation(s)
- Lakhvir Kaur Dhaliwal
- Department of Plant and Soil ScienceCollege of Agricultural Sciences and Natural ResourcesTexas Tech UniversityLubbockTexasUSA
| | - Ritchel B. Gannaban
- Department of Plant and Soil ScienceCollege of Agricultural Sciences and Natural ResourcesTexas Tech UniversityLubbockTexasUSA
- Present address:
Department of Nutritional SciencesCollege of Human SciencesTexas Tech UniversityLubbockTexasUSA
| | - Avinash Shrestha
- Department of Plant and Soil ScienceCollege of Agricultural Sciences and Natural ResourcesTexas Tech UniversityLubbockTexasUSA
| | - Junghyun Shim
- Department of Plant and Soil ScienceCollege of Agricultural Sciences and Natural ResourcesTexas Tech UniversityLubbockTexasUSA
- Present address:
Olam International LimitedNasarawaNigeria
| | - Puneet Kaur Mangat
- Department of Plant and Soil ScienceCollege of Agricultural Sciences and Natural ResourcesTexas Tech UniversityLubbockTexasUSA
| | - Joshua J. Singleton
- Department of Plant and Soil ScienceCollege of Agricultural Sciences and Natural ResourcesTexas Tech UniversityLubbockTexasUSA
- Present address:
College of Agriculture, Food and EnvironmentUniversity of KentuckyLexingtonKentuckyUSA
| | - Rosalyn B. Angeles‐Shim
- Department of Plant and Soil ScienceCollege of Agricultural Sciences and Natural ResourcesTexas Tech UniversityLubbockTexasUSA
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9
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Proline-Mediated Drought Tolerance in the Barley ( Hordeum vulgare L.) Isogenic Line Is Associated with Lateral Root Growth at the Early Seedling Stage. PLANTS 2021; 10:plants10102177. [PMID: 34685984 PMCID: PMC8538694 DOI: 10.3390/plants10102177] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 10/11/2021] [Accepted: 10/11/2021] [Indexed: 12/02/2022]
Abstract
A vigorous root system in barley promotes water uptake from the soil under water-limited conditions. We investigated three spring barley genotypes with varying water stress responses using rhizoboxes at the seedling stage. The genotypes comprised two elite German cultivars, Barke and Scarlett, and a near-isogenic line, NIL 143. The isogenic line harbors the wild allele pyrroline-5-carboxylate synthase1-P5cs1. Root growth in rhizoboxes under reduced water availability conditions caused a significant reduction in total root length, rooting depth, root maximum width, and root length density. On average, root growth was reduced by more than 20% due to water stress. Differences in organ proline concentrations were observed for all genotypes, with shoots grown under water stress exhibiting at least a 30% higher concentration than the roots. Drought induced higher leaf and root proline concentrations in NIL 143 compared with any of the other genotypes. Under reduced water availability conditions, NIL 143 showed less severe symptoms of drought, higher lateral root length, rooting depth, maximum root width, root length density, and convex hull area compared with Barke and Scarlett. Within the same comparison, under water stress, NIL 143 had a higher proportion of lateral roots (+30%), which were also placed at deeper substrate horizons. NIL 143 had a less negative plant water potential and higher relative leaf water content and stomatal conductance compared with the other genotypes under water stress. Under these conditions, this genotype also maintained an enhanced net photosynthetic rate and exhibited considerable fine root growth (diameter class 0.05–0.35 mm). These results show that water stress induces increased shoot and root proline accumulation in the NIL 143 barley genotype at the seedling stage and that this effect is associated with increased lateral root growth.
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Evaluation of RGB and Multispectral Unmanned Aerial Vehicle (UAV) Imagery for High-Throughput Phenotyping and Yield Prediction in Barley Breeding. REMOTE SENSING 2021. [DOI: 10.3390/rs13142670] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
With advances in plant genomics, plant phenotyping has become a new bottleneck in plant breeding and the need for reliable high-throughput plant phenotyping techniques has emerged. In the face of future climatic challenges, it does not seem appropriate to continue to solely select for grain yield and a few agronomically important traits. Therefore, new sensor-based high-throughput phenotyping has been increasingly used in plant breeding research, with the potential to provide non-destructive, objective and continuous plant characterization that reveals the formation of the final grain yield and provides insights into the physiology of the plant during the growth phase. In this context, we present the comparison of two sensor systems, Red-Green-Blue (RGB) and multispectral cameras, attached to unmanned aerial vehicles (UAV), and investigate their suitability for yield prediction using different modelling approaches in a segregating barley introgression population at three environments with weekly data collection during the entire vegetation period. In addition to vegetation indices, morphological traits such as canopy height, vegetation cover and growth dynamics traits were used for yield prediction. Repeatability analyses and genotype association studies of sensor-based traits were compared with reference values from ground-based phenotyping to test the use of conventional and new traits for barley breeding. The relative height estimation of the canopy by UAV achieved high precision (up to r = 0.93) and repeatability (up to R2 = 0.98). In addition, we found a great overlap of detected significant genotypes between the reference heights and sensor-based heights. The yield prediction accuracy of both sensor systems was at the same level and reached a maximum prediction accuracy of r2 = 0.82 with a continuous increase in precision throughout the entire vegetation period. Due to the lower costs and the consumer-friendly handling of image acquisition and processing, the RGB imagery seems to be more suitable for yield prediction in this study.
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Shrestha A, Cudjoe DK, Kamruzzaman M, Siddique S, Fiorani F, Léon J, Naz AA. Abscisic acid-responsive element binding transcription factors contribute to proline synthesis and stress adaptation in Arabidopsis. JOURNAL OF PLANT PHYSIOLOGY 2021; 261:153414. [PMID: 33895677 DOI: 10.1016/j.jplph.2021.153414] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 03/19/2021] [Accepted: 03/31/2021] [Indexed: 06/12/2023]
Abstract
Proline accumulation is one of the most common adaptive responses of higher plants against abiotic stresses like drought. It plays multiple roles in osmotic adjustment, cell homeostasis and stress recovery. Genetic regulation of proline accumulation under drought is complex, and transcriptional cascades modulating proline is poorly understood. Here, we employed quadruple mutant (abf1 abf2 abf3 abf4) to dissect the role of ABA-responsive elements (ABREs) binding transcription factors (ABFs) in modulating proline accumulation across varying stress scenarios. ABREs are present across the promoter of the P5CS1 gene, whose upregulation is considered a hallmark for drought inducible proline accumulation. Upon ABA treatment, P5CS1 mRNA expression and proline content in the shoot were significantly higher in Col-0 compared to the quadruple mutant. Similar results were found at 2 h and 3 h after acute dehydration. We quantified proline at different time points after drought stress treatment. The proline content was higher in wild type (Col-0) than the quadruple mutant at the early stage of drought. Notably, the proline accumulation in wild type increased at a slower rate than the quadruple mutant 7 d after drought stress. Besides, the quadruple mutant displayed significant oxidative damage, low tissue turgidity and higher membrane damage under terminal drought stress. Both terminal drought stress and long-term constant water stress revealed substantial differences in growth rate between wild type and quadruple mutant. The study provides evidence that ABFs are involved in drought stress response, such as proline biosynthesis in Arabidopsis.
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Affiliation(s)
- Asis Shrestha
- Department of Plant Breeding, Institute of Crop Science and Resource Conservation, University of Bonn, Germany.
| | - Daniel Kingsley Cudjoe
- Department of Plant Breeding, Institute of Crop Science and Resource Conservation, University of Bonn, Germany.
| | - Mohammad Kamruzzaman
- Department of Plant Breeding, Institute of Crop Science and Resource Conservation, University of Bonn, Germany.
| | | | - Fabio Fiorani
- IBG-2- Plant Sciences, Forschungszentrum Jülich, Jülich, Germany.
| | - Jens Léon
- Department of Plant Breeding, Institute of Crop Science and Resource Conservation, University of Bonn, Germany.
| | - Ali Ahmad Naz
- Department of Plant Breeding, Institute of Crop Science and Resource Conservation, University of Bonn, Germany.
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12
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Frimpong F, Windt CW, van Dusschoten D, Naz AA, Frei M, Fiorani F. A Wild Allele of Pyrroline-5-Carboxylate Synthase1 Leads to Proline Accumulation in Spikes and Leaves of Barley Contributing to Improved Performance Under Reduced Water Availability. FRONTIERS IN PLANT SCIENCE 2021; 12:633448. [PMID: 33719307 PMCID: PMC7947243 DOI: 10.3389/fpls.2021.633448] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 01/25/2021] [Indexed: 05/05/2023]
Abstract
Water stress (WS) during spike development strongly affects final grain yield and grain quality in cereals. Proline, an osmoprotectant amino-acid, may contribute to alleviating the effects of cell and tissue dehydration. We studied five spring barley genotypes contrasting in their drought response, including two introgression lines, S42IL-143 and S42IL-141, harboring a Pyrroline-5-carboxylate synthase1- P5cs1 allele originating from the wild barley accession ISR42-8. We tested the hypothesis that barley genotypes harboring a wild allele at P5cs1 locus are comparatively more drought-tolerant at the reproductive stage by inducing proline accumulation in their immature spikes. At the booting stage, we subjected plants to well-watered and WS treatments until physiological maturity. Several morpho-physiological traits had significant genotype by treatment interaction and reduction under WS. Varying levels of genotypic proline accumulation and differences in WS tolerance were observed. Spike proline accumulation was higher than leaf proline accumulation for all genotypes under WS. Also, introgression lines carrying a wild allele at P5cs1 locus had a markedly higher spike and leaf proline content compared with the other genotypes. These introgression lines showed milder drought symptoms compared with elite genotypes, remained photosynthetically active under WS, and maintained their intrinsic water use efficiency. These combined responses contributed to the achievement of higher final seed productivity. Magnetic resonance imaging (MRI) of whole spikes at the soft dough stage showed an increase in seed abortion among the elite genotypes compared with the introgression lines 15 days after WS treatment. Our results suggest that proline accumulation at the reproductive stage contributes to the maintenance of grain formation under water shortage.
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Affiliation(s)
- Felix Frimpong
- Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum Jülich GmbH, Jülich, Germany
- CSIR-Crops Research Institute, Kumasi, Ghana
| | - Carel W. Windt
- Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum Jülich GmbH, Jülich, Germany
| | - Dagmar van Dusschoten
- Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum Jülich GmbH, Jülich, Germany
| | - Ali A. Naz
- Department of Plant Breeding, Institute of Crop Science and Resource Conservation, University of Bonn, Bonn, Germany
| | - Michael Frei
- Institute of Agronomy and Plant Breeding, Justus-Liebig-Universität Gießen, Gießen, Germany
| | - Fabio Fiorani
- Institute of Bio- and Geosciences, IBG-2: Plant Sciences, Forschungszentrum Jülich GmbH, Jülich, Germany
- *Correspondence: Fabio Fiorani,
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13
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Kreszies T, Eggels S, Kreszies V, Osthoff A, Shellakkutti N, Baldauf JA, Zeisler-Diehl VV, Hochholdinger F, Ranathunge K, Schreiber L. Seminal roots of wild and cultivated barley differentially respond to osmotic stress in gene expression, suberization, and hydraulic conductivity. PLANT, CELL & ENVIRONMENT 2020; 43:344-357. [PMID: 31762057 DOI: 10.1111/pce.13675] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Revised: 10/23/2019] [Accepted: 11/03/2019] [Indexed: 05/13/2023]
Abstract
Wild barley, Hordeum vulgare spp. spontaneum, has a wider genetic diversity than its cultivated progeny, Hordeum vulgare spp. vulgare. Osmotic stress leads to a series of different responses in wild barley seminal roots, ranging from no changes in suberization to enhanced endodermal suberization of certain zones and the formation of a suberized exodermis, which was not observed in the modern cultivars studied so far. Further, as a response to osmotic stress, the hydraulic conductivity of roots was not affected in wild barley, but it was 2.5-fold reduced in cultivated barley. In both subspecies, osmotic adjustment by increasing proline concentration and decreasing osmotic potential in roots was observed. RNA-sequencing indicated that the regulation of suberin biosynthesis and water transport via aquaporins were different between wild and cultivated barley. These results indicate that wild barley uses different strategies to cope with osmotic stress compared with cultivated barley. Thus, it seems that wild barley is better adapted to cope with osmotic stress by maintaining a significantly higher hydraulic conductivity of roots during water deficit.
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Affiliation(s)
- Tino Kreszies
- Department of Ecophysiology, Institute of Cellular and Molecular Botany, University of Bonn, Bonn, 53115, Germany
| | - Stella Eggels
- Department of Ecophysiology, Institute of Cellular and Molecular Botany, University of Bonn, Bonn, 53115, Germany
- Plant Breeding, TUM School of Life Sciences Weihenstephan, Technical University of Munich, Munich, 85354, Germany
| | - Victoria Kreszies
- Department of Ecophysiology, Institute of Cellular and Molecular Botany, University of Bonn, Bonn, 53115, Germany
| | - Alina Osthoff
- Crop Functional Genomics, Institute of Crop Science and Resource Conservation (INRES), University of Bonn, Bonn, 53113, Germany
| | - Nandhini Shellakkutti
- Department of Ecophysiology, Institute of Cellular and Molecular Botany, University of Bonn, Bonn, 53115, Germany
| | - Jutta A Baldauf
- Crop Functional Genomics, Institute of Crop Science and Resource Conservation (INRES), University of Bonn, Bonn, 53113, Germany
| | - Viktoria V Zeisler-Diehl
- Department of Ecophysiology, Institute of Cellular and Molecular Botany, University of Bonn, Bonn, 53115, Germany
| | - Frank Hochholdinger
- Crop Functional Genomics, Institute of Crop Science and Resource Conservation (INRES), University of Bonn, Bonn, 53113, Germany
| | - Kosala Ranathunge
- School of Biological Sciences, Faculty of Science, University of Western Australia, Perth, 6009, Australia
| | - Lukas Schreiber
- Department of Ecophysiology, Institute of Cellular and Molecular Botany, University of Bonn, Bonn, 53115, Germany
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14
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Shao Y, Cheng Y, Pang H, Chang M, He F, Wang M, Davis DJ, Zhang S, Betz O, Fleck C, Dai T, Madahhosseini S, Wilkop T, Jernstedt J, Drakakaki G. Investigation of Salt Tolerance Mechanisms Across a Root Developmental Gradient in Almond Rootstocks. FRONTIERS IN PLANT SCIENCE 2020; 11:595055. [PMID: 33469461 PMCID: PMC7813803 DOI: 10.3389/fpls.2020.595055] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2020] [Accepted: 11/23/2020] [Indexed: 05/09/2023]
Abstract
The intensive use of groundwater in agriculture under the current climate conditions leads to acceleration of soil salinization. Given that almond is a salt-sensitive crop, selection of salt-tolerant rootstocks can help maintain productivity under salinity stress. Selection for tolerant rootstocks at an early growth stage can reduce the investment of time and resources. However, salinity-sensitive markers and salinity tolerance mechanisms of almond species to assist this selection process are largely unknown. We established a microscopy-based approach to investigate mechanisms of stress tolerance in and identified cellular, root anatomical, and molecular traits associated with rootstocks exhibiting salt tolerance. We characterized three almond rootstocks: Empyrean-1 (E1), Controller-5 (C5), and Krymsk-86 (K86). Based on cellular and molecular evidence, our results show that E1 has a higher capacity for salt exclusion by a combination of upregulating ion transporter expression and enhanced deposition of suberin and lignin in the root apoplastic barriers, exodermis, and endodermis, in response to salt stress. Expression analyses revealed differential regulation of cation transporters, stress signaling, and biopolymer synthesis genes in the different rootstocks. This foundational study reveals the mechanisms of salinity tolerance in almond rootstocks from cellular and structural perspectives across a root developmental gradient and provides insights for future screens targeting stress response.
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Affiliation(s)
- Yuhang Shao
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
- Key Laboratory of Crop Physiology Ecology and Production Management of Ministry of Agriculture, Nanjing Agricultural University, Nanjing, China
| | - Yukun Cheng
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
- Triticeae Research Institute, Sichuan Agricultural University, Chengdu, China
| | - Hongguang Pang
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
- College of Horticulture, Hebei Agricultural University, Baoding, China
| | - Mingqin Chang
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
| | - Fang He
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
- College of Forestry, Sichuan Agricultural University, Chengdu, China
| | - Minmin Wang
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
| | - Destiny J. Davis
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
| | - Shuxiao Zhang
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
| | - Oliver Betz
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
| | - Chuck Fleck
- Sierra Gold Nurseries, Yuba City, CA, United States
| | - Tingbo Dai
- Key Laboratory of Crop Physiology Ecology and Production Management of Ministry of Agriculture, Nanjing Agricultural University, Nanjing, China
| | - Shahab Madahhosseini
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
- Genetic and Plant Production Department, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
| | - Thomas Wilkop
- Light Microscopy Core, University of Kentucky, Lexington, KY, United States
| | - Judy Jernstedt
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
| | - Georgia Drakakaki
- Department of Plant Sciences, University of California, Davis, Davis, CA, United States
- *Correspondence: Georgia Drakakaki,
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15
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Sendek A, Karakoç C, Wagg C, Domínguez-Begines J, do Couto GM, van der Heijden MGA, Naz AA, Lochner A, Chatzinotas A, Klotz S, Gómez-Aparicio L, Eisenhauer N. Drought modulates interactions between arbuscular mycorrhizal fungal diversity and barley genotype diversity. Sci Rep 2019; 9:9650. [PMID: 31273222 PMCID: PMC6609766 DOI: 10.1038/s41598-019-45702-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Accepted: 06/07/2019] [Indexed: 01/31/2023] Open
Abstract
Droughts associated with climate change alter ecosystem functions, especially in systems characterized by low biodiversity, such as agricultural fields. Management strategies aimed at buffering climate change effects include the enhancement of intraspecific crop diversity as well as the diversity of beneficial interactions with soil biota, such as arbuscular mycorrhizal fungi (AMF). However, little is known about reciprocal relations of crop and AMF diversity under drought conditions. To explore the interactive effects of plant genotype richness and AMF richness on plant yield under ambient and drought conditions, we established fully crossed diversity gradients in experimental microcosms. We expected highest crop yield and drought tolerance at both high barley and AMF diversity. While barley richness and AMF richness altered the performance of both barley and AMF, they did not mitigate detrimental drought effects on the plant and AMF. Root biomass increased with mycorrhiza colonization rate at high AMF richness and low barley richness. AMF performance increased under higher richness of both barley and AMF. Our findings indicate that antagonistic interactions between barley and AMF may occur under drought conditions, particularly so at higher AMF richness. These results suggest that unexpected alterations of plant-soil biotic interactions could occur under climate change.
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Affiliation(s)
- Agnieszka Sendek
- Systematic Botany and Functional Biodiversity, Institute of Biology, Leipzig University, Johannisallee 21-23, 04103, Leipzig, Germany.
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103, Leipzig, Germany.
- Department of Community Ecology, UFZ-Helmholtz Centre for Environmental Research, Theodor-Lieser-Strasse 4, 06120, Halle, Germany.
- Department of Geobotany and Botanical Garden, Martin Luther University of Halle-Wittenberg, Am Kirchweg 2, 06108, Halle, Germany.
| | - Canan Karakoç
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103, Leipzig, Germany
- Department of Environmental Microbiology, UFZ-Helmholtz Centre for Environmental Research, Permoserstrasse 15, 04318, Leipzig, Germany
| | - Cameron Wagg
- Department of Evolutionary Biology and Environmental Studies, University of Zürich, Winterthurerstr. 190, Zürich, CH-8057, Switzerland
- Fredericton Research and Development Center, Agriculture and Agri-Food Canada, 850 Lincoln Road, Fredericton, New Brunswick, E3B 4Z7, Canada
| | - Jara Domínguez-Begines
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103, Leipzig, Germany
- Institute of Natural Resources and Agrobiology of Seville (IRNAS), CSIC, LINCGlobal, Avenida Reina Mercedes, 10, 41012, Sevilla, Spain
| | - Gabriela Martucci do Couto
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103, Leipzig, Germany
- Institute of Biology, Leipzig University, Deutscher Platz 5e, 04103, Leipzig, Germany
| | - Marcel G A van der Heijden
- Plant-Soil-Interactions, Department of Agroecology and Environment, Agroscope, Reckenholzstrasse 191, 8046, Zurich, Switzerland
- Department of Plant and Microbial Biology, University of Zurich, Zollikerstrasse 107, 8008, Zurich, Switzerland
| | - Ali Ahmad Naz
- Crop Genetics and Biotechnology Unit, Institute of Crop Science and Resource Conservation, University of Bonn, Katzenburgweg 5, 53115, Bonn, Germany
| | - Alfred Lochner
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103, Leipzig, Germany
- Institute of Biology, Leipzig University, Deutscher Platz 5e, 04103, Leipzig, Germany
| | - Antonis Chatzinotas
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103, Leipzig, Germany
- Department of Environmental Microbiology, UFZ-Helmholtz Centre for Environmental Research, Permoserstrasse 15, 04318, Leipzig, Germany
| | - Stefan Klotz
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103, Leipzig, Germany
- Department of Community Ecology, UFZ-Helmholtz Centre for Environmental Research, Theodor-Lieser-Strasse 4, 06120, Halle, Germany
| | - Lorena Gómez-Aparicio
- Institute of Natural Resources and Agrobiology of Seville (IRNAS), CSIC, LINCGlobal, Avenida Reina Mercedes, 10, 41012, Sevilla, Spain
| | - Nico Eisenhauer
- German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig, Deutscher Platz 5e, 04103, Leipzig, Germany
- Institute of Biology, Leipzig University, Deutscher Platz 5e, 04103, Leipzig, Germany
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16
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Kovács H, Aleksza D, Baba AI, Hajdu A, Király AM, Zsigmond L, Tóth SZ, Kozma-Bognár L, Szabados L. Light Control of Salt-Induced Proline Accumulation Is Mediated by ELONGATED HYPOCOTYL 5 in Arabidopsis. FRONTIERS IN PLANT SCIENCE 2019; 10:1584. [PMID: 31921239 PMCID: PMC6914869 DOI: 10.3389/fpls.2019.01584] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 11/12/2019] [Indexed: 05/21/2023]
Abstract
Plants have to adapt their metabolism to constantly changing environmental conditions, among which the availability of light and water is crucial in determining growth and development. Proline accumulation is one of the sensitive metabolic responses to extreme conditions; it is triggered by salinity or drought and is regulated by light. Here we show that red and blue but not far-red light is essential for salt-induced proline accumulation, upregulation of Δ1-PYRROLINE-5-CARBOXYLATE SYNTHASE 1 (P5CS1) and downregulation of PROLINE DEHYDROGENASE 1 (PDH1) genes, which control proline biosynthetic and catabolic pathways, respectively. Chromatin immunoprecipitation and electrophoretic mobility shift assays demonstrated that the transcription factor ELONGATED HYPOCOTYL 5 (HY5) binds to G-box and C-box elements of P5CS1 and a C-box motif of PDH1. Salt-induced proline accumulation and P5CS1 expression were reduced in the hy5hyh double mutant, suggesting that HY5 promotes proline biosynthesis through connecting light and stress signals. Our results improve our understanding on interactions between stress and light signals, confirming HY5 as a key regulator in proline metabolism.
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Affiliation(s)
- Hajnalka Kovács
- Institute of Plant Biology, Biological Research Centre, Szeged, Hungary
| | - Dávid Aleksza
- Institute of Plant Biology, Biological Research Centre, Szeged, Hungary
| | - Abu Imran Baba
- Institute of Plant Biology, Biological Research Centre, Szeged, Hungary
| | - Anita Hajdu
- Institute of Plant Biology, Biological Research Centre, Szeged, Hungary
| | - Anna Mária Király
- Institute of Plant Biology, Biological Research Centre, Szeged, Hungary
| | - Laura Zsigmond
- Institute of Plant Biology, Biological Research Centre, Szeged, Hungary
| | - Szilvia Z. Tóth
- Institute of Plant Biology, Biological Research Centre, Szeged, Hungary
| | - László Kozma-Bognár
- Institute of Plant Biology, Biological Research Centre, Szeged, Hungary
- Department of Genetics, Faculty of Sciences and Informatics, University of Szeged, Szeged, Hungary
| | - László Szabados
- Institute of Plant Biology, Biological Research Centre, Szeged, Hungary
- *Correspondence: László Szabados,
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