Developing a Selection Criterion for Terminal Heat Tolerance in Bread Wheat Based on Various Mopho-Physiological Traits

Sharma, D.R.; Jaiswal, J. P.; Singh, Naveen; Chauhan, Anjana; Gahtyari, Navin Chander

doi:10.20546/ijcmas.2018.707.318

Cited by 15 publications

(8 citation statements)

References 11 publications

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“…The CTD, NDVI, MSI and HSI traits have been extensively studied for the improvement of tolerance to HS in several crops such as sorghum (Sullivan, 1972) and rice (Anantha et al ., 2016). Significant genetic variation for these physiological traits is in line with the earlier observations documented in wheat for CTD, NDVI, MSI and HSI under HS (Sharma et al ., 2018). High heritability was recorded for NDV (89%), MSI (82%) and CTD (70%) in comparison to HSI (64%).…”

Section: Discussionmentioning

confidence: 99%

“…Importantly, the panel involved heat tolerant and sensitive genotypes as reported by Sharma et al . (2018). The genotypes were subjected to delayed planting to expose terminal growth stage to HS conditions (online Supplementary Fig.…”

Section: Methodsmentioning

confidence: 99%

“…A set of 40 bread wheat genotypes comprising tolerant and sensitive exotic and indigenous genotypes including lines from Washington State University, Pullman, USA and landraces was used in the present investigation (online Supplementary Table S1). Importantly, the panel involved heat tolerant and sensitive genotypes as reported by Sharma et al (2018). The genotypes were subjected to delayed planting to expose terminal growth stage to HS conditions (online Supplementary Fig.…”

Section: Planting Materialsmentioning

confidence: 99%

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Population structure, marker-trait association and identification of candidate genes for terminal heat stress relevant traits in bread wheat (Triticum aestivum L. em Thell)

Sharma

Jaiswal

Gahtyari

et al. 2020

Plant Genet. Resour.

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Genetic improvement along with widened crop base necessitates for the detailed understanding of the genetic diversity and population structure in wheat. The present investigation reports the discovery of a total of 182 alleles by assaying 52 simple sequence repeats (SSRs) on 40 genotypes of bread wheat. Unweighted neighbour-joining method grouped these genotypes into two main clusters. Highly heat tolerant and intermediate tolerant cultivars were grouped in the same cluster, whereas remaining genotypes, particularly sensitive ones, were assigned different cluster. Similarly, the entire population was structured into two sub-populations (K = 2), closely corresponding with the other distance-based clustering patterns. The marker-trait association was discovered for four important physiological parameters, viz. canopy temperature depression, membrane thermostability index (MSI), normalized difference vegetation index and heat susceptibility index, indicating for heat stress (HS) tolerance in wheat. Both general and mixed linear models of association studies during 2017 and 2018, revealed the association of SSR markers, wmc222 (17.60%, PV) and gwm34 (20.70%, PV) with the mean phenotypic value of MSI. Likewise, SSR markers barc183, gwm75, gwm11 and cfd7 revealed a unique relationship with four selected physiological traits. Candidate genes discovered using in silico tools had nine SSR markers within the genic regions reported to play a role in heat and drought stress responses in plants. The information generated about these genic regions may be explored further in expression studies in-vivo to impart HS tolerance in bread wheat.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Planting Materialsmentioning

confidence: 99%

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Population structure, marker-trait association and identification of candidate genes for terminal heat stress relevant traits in bread wheat (Triticum aestivum L. em Thell)

Sharma

Jaiswal

Gahtyari

et al. 2020

Plant Genet. Resour.

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“…The coefficient of variation of CTD in different studies ranges from middle (10-14 % (Sharma P. et al, 2017;Jokar et al, 2018)) to high (26-43 % (Kumar et al, 2017;Sharma D. et al, 2018)). Dryland conditions make CTD values negative (Thapa et al, 2018) and increase genotypic differences (Pinto et al, 2010).…”

Section: Variation and Heritability Of Ctdmentioning

confidence: 99%

Canopy temperature depression for droughtand heat stress tolerance in wheat breeding

Лепехов

2022

Vestn. VOGiS

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An infrared thermometer was first used to assess drought and heat tolerance in plant breeding more than 40 years ago. Soon afterward, this method became widely used throughout the world. However, Russia has not yet applied the described method for evaluating stress tolerance. This paper presents an overview of using infrared thermometry in plant breeding. Taking wheat as an example, it shows major advantages and disadvantages of canopy temperature depression (CTD) values measured by the infrared thermometer. The paper also demonstrates that genotypes with higher CTD values, and therefore with a lower canopy temperature, use more available soil moisture under drought stress to cool the canopy by transpiration. It refers to CTD as an integrative trait that reflects an overall plant water status. Its coefficient of variation lies in the interval of 10 to 43 %. A large number of publications illustrate a close relation between CTD values and yield and indicate a high heritability of the former. Meanwhile, the same works show that yield has a higher heritability. Moreover, some researchers doubt that CTD should be used in applied wheat breeding as there are many factors that influence it. CTD has a high correlation with other traits that reflect plant water status or their adaptation to drought or heat stress. Quantitative trait loci (QTLs) associated with CTD are localized in all chromosomes, except for 3D. These QTLs often explain a small part of phenotypic variance (10–20 %, more likely less than 10 %), which complicates the pyramiding of canopy temperature genes through marker-assisted selection. The paper concludes that the evaluation of CTD appears to be a reliable, relatively simple, labor-saving, objective, and non-invasive method that sets it apart from other methods as well as shows the best results under terminal drought and heat stress conditions.

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“…Previous studies have also shown the association of simple sequence repeats (SSRs) with heat-stress-responsive traits (Hassan, 2016;Sharma et al, 2018;Al-Ashkar et al, 2020;Saha et al, 2020). SSRs, also called as microsatellites are one-to sixnucleotide long tandem repeats distributed randomly throughout the genome (Gupta et al, 1996;Chen et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Discovery of miRNAs and Development of Heat-Responsive miRNA-SSR Markers for Characterization of Wheat Germplasm for Terminal Heat Tolerance Breeding

et al. 2021

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A large proportion of the Asian population fulfills their energy requirements from wheat (Triticum aestivum L.). Wheat quality and yield are critically affected by the terminal heat stress across the globe. It affects approximately 40% of the wheat-cultivating regions of the world. Therefore, there is a critical need to develop improved terminal heat-tolerant wheat varieties. Marker-assisted breeding with genic simple sequence repeats (SSR) markers have been used for developing terminal heat-tolerant wheat varieties; however, only few studies involved the use of microRNA (miRNA)-based SSR markers (miRNA-SSRs) in wheat, which were found as key players in various abiotic stresses. In the present study, we identified 104 heat-stress-responsive miRNAs reported in various crops. Out of these, 70 miRNA-SSR markers have been validated on a set of 20 terminal heat-tolerant and heat-susceptible wheat genotypes. Among these, only 19 miRNA-SSR markers were found to be polymorphic, which were further used to study the genetic diversity and population structure. The polymorphic miRNA-SSRs amplified 61 SSR loci with an average of 2.9 alleles per locus. The polymorphic information content (PIC) value of polymorphic miRNA-SSRs ranged from 0.10 to 0.87 with a mean value of 0.48. The dendrogram constructed using unweighted neighbor-joining method and population structure analysis clustered these 20 wheat genotypes into 3 clusters. The target genes of these miRNAs are involved either directly or indirectly in providing tolerance to heat stress. Furthermore, two polymorphic markers miR159c and miR165b were declared as very promising diagnostic markers, since these markers showed specific alleles and discriminated terminal heat-tolerant genotypes from the susceptible genotypes. Thus, these identified miRNA-SSR markers will prove useful in the characterization of wheat germplasm through the study of genetic diversity and population structural analysis and in wheat molecular breeding programs aimed at terminal heat tolerance of wheat varieties.

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Developing a Selection Criterion for Terminal Heat Tolerance in Bread Wheat Based on Various Mopho-Physiological Traits

Cited by 15 publications

References 11 publications

Population structure, marker-trait association and identification of candidate genes for terminal heat stress relevant traits in bread wheat (Triticum aestivum L. em Thell)

Population structure, marker-trait association and identification of candidate genes for terminal heat stress relevant traits in bread wheat (Triticum aestivum L. em Thell)

Canopy temperature depression for droughtand heat stress tolerance in wheat breeding

Discovery of miRNAs and Development of Heat-Responsive miRNA-SSR Markers for Characterization of Wheat Germplasm for Terminal Heat Tolerance Breeding

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