Stay-green trait serves as yield stability attribute under combined heat and drought stress in wheat (Triticum aestivum L.)

Kumar, Rajeev; Harikrishna,; Barman, Dipankar; Ghimire, Om Prakash; Gurumurthy, S. B.; Singh, Premlata; Chinnusamy, Viswanathan; Padaria, Jasdeep Chatrath; Arora, Ajay

doi:10.1007/s10725-021-00758-w

Cited by 16 publications

(10 citation statements)

References 51 publications

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“…Direct evidence for the contribution of this trait to high-yield potential is lacking. Therefore, a greater understanding of this trait is needed to explore possible selection of SG because it is expected to have a significant role in the productivity of wheat, particularly under harsh environments [ 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Molecular and Physiological Evaluation of Bread Wheat (Triticum aestivum L.) Genotypes for Stay Green under Drought Stress

Zada

Ali

Binjawhar

et al. 2022

Genes

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Water availability is considered as the main limiting factor of wheat growth illuminating the need of cultivars best adapted to drought situations for better wheat production and yield. Among these, the stay-green trait is thought to be related to the ability of wheat plants to maintain photosynthesis and CO2 assimilation, and a detailed molecular understanding of this trait may help in the selection of high-yielding, drought-tolerant wheats. The current study, therefore, evaluated the physiological responses of the selected wheat genotypes under pot-induced water stress conditions through different field capacities. The study also focused on exploring the molecular mechanisms involved in drought tolerance conferred due to the stay-green trait by studying the expression pattern of the selected PSI-associated light-harvesting complex I (LHC1) and PSII-associated LHCII gene families related to pigment-binding proteins. The results revealed that the studied traits, including relative water content, membrane stability index and chlorophyll, were variably and negatively affected, while the proline content was positively enhanced in the studied wheats under water stress treatments. Molecular diagnosis of the selected wheat genotypes using the expression profile of 06 genes, viz. TaLhca1, TaLhca2, TaLhca3, TaLhcb1, TaLhcb4 and TaLhcb6 that encodes for the LHCI and LHCII proteins, indicated variable responses to different levels of drought stress. The results obtained showed the relation between the genotypes and the severity of the drought stress condition. Among the studied genotypes, Chirya-1 and SD-28 performed well with a higher level of gene expression under drought stress conditions and may be used in genetic crosses to enrich the genetic background of common wheat against drought stress.

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Section: Introductionmentioning

confidence: 99%

Molecular and Physiological Evaluation of Bread Wheat (Triticum aestivum L.) Genotypes for Stay Green under Drought Stress

Zada

Ali

Binjawhar

et al. 2022

Genes

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“…Drought stress adversely affects plant growth by accelerating senescence, lowering photosynthesis and producing poor yield [18]. The maintenance of greenness allows a genotype to prolong the photosynthesis and the grain filling duration, which may provide a yield advantage especially under severe water deficit conditions [18,56]. We observed a positive and significant correlation of NDVI with grain yield specifically under drought but not under control at the BHU center.…”

Section: Discussionmentioning

confidence: 86%

Spatio-temporal evaluation of drought adaptation in wheat revealed NDVI and MTSI as powerful tools for selecting tolerant genotypes

Reddy¹,

Singh²,

Kumar

et al. 2023

Preprint

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Context: Water stress is fast becoming a major limiting factor for wheat production. Hence, identifying drought tolerant genotypes is critical for sustaining the food supply chain. However, there are no phenotypic markers or statistical models available that may be employed for the efficient selection of field grown drought tolerant wheat genotypes. Objectives: We evaluated wheat genotypes to (1) identify novel sources of drought tolerance (2) understand underlying adaptation mechanisms of drought tolerance (3) identify phenotypic markers and a stable model for the selection of drought tolerant genotypes. Methods: One hundred ninety-six diverse wheat genotypes were evaluated at three different locations in India: Banaras Hindu University (BHU), Varanasi (E1 and E3: control; E2 and E4: drought); Agharkar Research Institute (ARI), Pune (E5 and E7: control; E6 and E8: drought) and Borlaug Institute for South Asia (BISA), Jabalpur (E9 and E11: control; E10 and E12: drought) for various agronomic, physiological and yield traits for two consecutive years. Drought was imposed at the heading stage (Z59) by withholding irrigation for four weeks until the moisture reading reached <45% than the control (100%). Results: The performance of all genotypes significantly declined under drought at all the locations. Normalized difference vegetation index (NDVI) significantly correlated (r = 0.41** and 0.36**) with the grain yield under drought during maturity. At the same time, there was no association under control conditions (r = 0.07 and 0.10) at the BHU center during 2020-21 and 2021-22, respectively. Stress indices, such as geometric mean productivity (GMP) and stress tolerance index (STI), showed a high correlation (r= 0.89** and r = 0.88**, respectively) with the grain yield under drought and were effective in differentiating drought tolerant genotypes. GGE bi-plots discriminated the environments (observed obtuse angle between E3 with E6 and E9, E4 with E6 and E9) having negative relation and cross-over interaction for grain yield. Further, the multi-trait stability index (MTSI) identified 29 stable genotypes across all environments and was predicted as the most accurate model due to its fewer Root Mean Square Prediction Difference (RMSPD) values. Conclusion: NDVI is a useful high throughput screening tool under drought and MTSI is an effective method for selecting stable wheat genotypes across different water stressed locations. Implications: The identified tools (NDVI), method (MTSI), and tolerant genotypes appear to be valuable resources that together will be useful in the ongoing breeding programs to enhance the drought tolerance of wheat.

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“…Previous studies on the genetic basis of grain quality and yield reduction in response to heat stress in wheat have found numerous QTLs for leaf senescence and Staygreen [103,141]. Mapping analyses identified 44 QTLs on chromosomes 1B, 2A, 2B, 4A, 4B and 7D associated with Staygreen, some of which were also co-locating with yield and yield-related traits [103].…”

Section: Wheatmentioning

confidence: 90%

“…A recent study showed that certain RILs maintained Staygreen traits under combined heat and drought stress at the anthesis stage. These RILs up-regulated known chlorophyll biosynthesis gene expression (including CHLD, a key enzyme for chlorophyll synthesis and chloroplast development), as well as down-regulated chlorophyll degradation gene expression (including pheide a oxidase (PaO), pheophytin pheophorbide hydrolyase (PPH) and Stay Green 1 (SGR1)) [141].…”

Section: Wheatmentioning

confidence: 99%

Genetic Improvement of Heat Stress Tolerance in Cereal Crops

Hill

2022

Agronomy

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Crop heat stress is a threat to food supply, with heatwaves expected to increase in frequency and intensity globally. In addition to yield loss, heat stress dramatically reduces fertility and seed-setting rate, grain quality and weight, and seed germination and growth. Genetic variability for heat stress tolerance can be used in breeding programs to develop tolerant genotypes. The availability of genome assemblies with high-confidence sequences for many cereal crops, including rice, maize, wheat and barley, now allows the identification of heat stress tolerance-associated genes and gene networks. This review focuses on synthesizing current advances in understanding the detrimental effects of heat stress on cereal crop production at the physiological and genetic levels. It provides an account of available genomic resources, genetic variation, candidate genes, and molecular markers for heat stress tolerance. Lastly, this review offers insight into crop genetic improvement for heat stress tolerance, including germplasm screening in glasshouse and field trials, marker-assisted selection, mapping genomic loci and identification of candidate genes, and genomic-assisted breeding.

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Stay-green trait serves as yield stability attribute under combined heat and drought stress in wheat (Triticum aestivum L.)

Cited by 16 publications

References 51 publications

Molecular and Physiological Evaluation of Bread Wheat (Triticum aestivum L.) Genotypes for Stay Green under Drought Stress

Molecular and Physiological Evaluation of Bread Wheat (Triticum aestivum L.) Genotypes for Stay Green under Drought Stress

Spatio-temporal evaluation of drought adaptation in wheat revealed NDVI and MTSI as powerful tools for selecting tolerant genotypes

Genetic Improvement of Heat Stress Tolerance in Cereal Crops

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