Characterisation and evaluation of wheat genetic resources for heat stress tolerance using stay-green traits

Soni, Aarti; Munjal, Renu

doi:10.1071/cp22119

Cited by 4 publications

(2 citation statements)

References 120 publications

(219 reference statements)

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“…The heritability of waxiness is low because of significant G × E interactions [62]. Genotypes with the stay-green trait performed better under heat stress and could be used for heat stress tolerance breeding [63].…”

Section: Trait Variability and Impact Of Heatstressmentioning

confidence: 99%

Identification of Climate-Smart Bread Wheat Germplasm Lines with Enhanced Adaptation to Global Warming

Patidar

Yadav

Kumari

et al. 2023

Plants

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Bread wheat (Triticum aestivum L.) is widely grown in sub-tropical and tropical areas and, as such, it is exposed to heatstress especially during the grain filling period (GFP). Global warming has further affected its production and productivity in these heat-stressed environments. We examined the effects of heatstress on 18 morpho-physiological and yield-related traits in 96 bread wheat accessions. Heat stress decreased crop growth and GFP, and consequently reduced morphological and yield-related traits in the delayed sown crop. A low heat susceptibility index and high yield stability were used for selecting tolerant accessions. Under heatstress, the days to 50% anthesis, flag-leaf area, chlorophyll content, normalized difference vegetation index (NDVI), thousand grain weight (TGW), harvest index and grain yield were significantly reduced both in tolerant and susceptible accessions. The reduction was severe in susceptible accessions (48.2% grain yield reduction in IC277741). The plant height, peduncle length and spike length showeda significant reduction in susceptible accessions, but a non-significant reduction in the tolerant accessions under the heatstress. The physiological traits like the canopy temperature depression (CTD), plant waxiness and leaf rolling were increased in tolerant accessions under heatstress. Scanning electron microscopy of matured wheat grains revealed ultrastructural changes in endosperm and aleurone cells due to heat stress. The reduction in size and density of large starch granules is the major cause of the yield and TGW decrease in the heat-stress-susceptible accessions. The most stable and high-yielding accessions, namely, IC566223, IC128454, IC335792, EC576707, IC535176, IC529207, IC446713 and IC416019 were identified as the climate-smart germplasm lines. We selected germplasm lines possessing desirable traits as potential parents for the development of bi-parent and multi-parent mapping populations.

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Section: Trait Variability and Impact Of Heatstressmentioning

confidence: 99%

Identification of Climate-Smart Bread Wheat Germplasm Lines with Enhanced Adaptation to Global Warming

Patidar

Yadav

Kumari

et al. 2023

Plants

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“…Among all the studied traits, number of primary branches showed the highest phenotypic coefficients of variation. Similarly, Soni and Munjal (2023) estimated heat stress tolerance of different wheat genetic resources including wild germplasm employing the stay-green trait. Interestingly, genotypes with stay-green trait were grouped together with genotypes with high grain yield and low leaf senescence rate and several genotypes were identified as potential candidates for breeding for heat stress tolerance.…”

mentioning

confidence: 99%

Crop wild relatives: the road to climate change adaptation

Khan,

Pandey,

Hamurcu

et al. 2023

Crop & Pasture Science

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Identification of Climate-Smart Bread Wheat Germplasm Lines With Enhanced Adaptation to Global Warming

Patidar¹,

Yadav²,

Kumari³

et al. 2023

Preprint

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Bread wheat (Triticum aestivum L.) is one of the world's most important staple food crop providing 20% global energy and dietary proteins. It is widely grown in sub-tropical and tropical areas and as such exposed to heat-stress especially at grain filling period (GFP). Global warming has further affected its production and productivity in these heat-stressed environments. We examined the effect of heat-stress on 18 morpho-physiological and yield-related traits in 96 bread wheat accessions. Heat susceptibility index (HSI <0.60) and yield stability (i <0.55) used as criteria for selecting the tolerant accessions. Heat-stress, imposed by delayed sowing, decreased crop growth and GFP, and as a result reduced morphological and yield-related traits, namely days to 50% anthesis, plant height, peduncle length, flag-leaf area, spike length, spikelets per spike, grain length and width, thousand grain weight (TGW), harvest index and yield. The reduction in the trait values was severe in susceptible accessions (48.2% yield reduction in IC277741) than the tolerant. Physiological traits like chlorophyll content, canopy temperature depression (CTD), normalized difference vegetation index (NDVI), plant waxiness and leaf rolling showed higher expression in the tolerant accessions under heat-stress. Scanning electron microscopy of matured wheat grains revealed ultrastructural changes in endosperm and aleurone cells caused due to heat-stress. The reduction of size and density of large starch granules is the major cause of yield and TGW decrease in the heat-stress susceptible lines. The most stable and high-yielding accessions namely IC566223, IC128454, IC335792, EC576707, IC535176, IC529207, IC446713 and IC416019 were identified as the climate-smart germplasm lines. Germplasm lines possessing desirable traits were selected as po-tential parents for the development of bi-parental and multi-parental populations.

show abstract

Characterisation and evaluation of wheat genetic resources for heat stress tolerance using stay-green traits

Cited by 4 publications

References 120 publications

Identification of Climate-Smart Bread Wheat Germplasm Lines with Enhanced Adaptation to Global Warming

Identification of Climate-Smart Bread Wheat Germplasm Lines with Enhanced Adaptation to Global Warming

Crop wild relatives: the road to climate change adaptation

Identification of Climate-Smart Bread Wheat Germplasm Lines With Enhanced Adaptation to Global Warming

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