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Open AccessArticle

Deciphering the Role of Stay-Green Trait to Mitigate Terminal Heat Stress in Bread Wheat

1
Department of Plant Sciences, Quaid-i-Azam University, Islamabad 45320, Pakistan
2
Department of Biology and Environmental Science, Allama Iqbal Open University, Islamabad 44000, Pakistan
3
Department of Agronomy, University of Florida, Gainesville, FL 32611, USA
4
Plant Physiology Program, Crop Sciences Institute, National Agricultural Research Centre, Islamabad 45500, Pakistan
5
Department of Agronomy, Horticulture and Plant Science, South Dakota State University, Brookings, SD 57007-1096, USA
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(7), 1001; https://doi.org/10.3390/agronomy10071001
Received: 10 June 2020 / Revised: 6 July 2020 / Accepted: 9 July 2020 / Published: 11 July 2020
The present study aimed to reveal the impact of the stay-green trait in bread wheat under terminal heat stress. Field experiments (early and late sowing; for two consecutive years) were conducted to investigate the influence of terminal heat stress on the morpho-physiological traits in different stay-green types i.e., non-stay-green, moderately non-stay-green, moderately stay-green, and stay-green. In addition, the greenhouse experiment was performed to dissect the stay-green trait in functional stay-green, non-functional stay-green, and non-stay-green genotypes. The results of the field experiments confirmed that genotypes exhibiting the stay-green trait have a significantly high chlorophyll content, normalized difference vegetative index, grain yield, biological yield, kernel weight, and low canopy temperature under control and heat stress conditions. In the greenhouse experiment, functional stay-green and non-functional stay-green genotypes showed a high chlorophyll content and photochemical efficiency, whereas biological yield and grain yield showed a significant relation with the functional stay-green genotype under control and terminal heat stress treatments. The sequencing and expression analysis of chlorophyllide a oxygenase (CaO), light-harvesting complex (Cab), stay-green (SGR), and red chlorophyll catabolite reductase (RCCR) in functional stay-green, non-functional stay-green, and non-stay-green genotypes revealed variations in the exons of CaO and RCCR; and significant difference in the regulation of CaO and Cab at 7 days after anthesis under terminal heat stress. This study confirms that genotypes displaying the stay-green trait can aid wheat breeders to cope with increasing temperature in the impending decades. View Full-Text
Keywords: Triticum aestivum L.; terminal heat stress; stay green; chlorophyllide a oxygenase gene; light-harvesting complex gene; stay-green gene; red chlorophyll catabolite reductase gene Triticum aestivum L.; terminal heat stress; stay green; chlorophyllide a oxygenase gene; light-harvesting complex gene; stay-green gene; red chlorophyll catabolite reductase gene
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MDPI and ACS Style

Latif, S.; Wang, L.; Khan, J.; Ali, Z.; Sehgal, S.K.; Babar, M.A.; Wang, J.; Quraishi, U.M. Deciphering the Role of Stay-Green Trait to Mitigate Terminal Heat Stress in Bread Wheat. Agronomy 2020, 10, 1001. https://doi.org/10.3390/agronomy10071001

AMA Style

Latif S, Wang L, Khan J, Ali Z, Sehgal SK, Babar MA, Wang J, Quraishi UM. Deciphering the Role of Stay-Green Trait to Mitigate Terminal Heat Stress in Bread Wheat. Agronomy. 2020; 10(7):1001. https://doi.org/10.3390/agronomy10071001

Chicago/Turabian Style

Latif, Sadia; Wang, Liping; Khan, Jahangir; Ali, Zeshan; Sehgal, Sunish K.; Babar, Md A.; Wang, Jianping; Quraishi, Umar M. 2020. "Deciphering the Role of Stay-Green Trait to Mitigate Terminal Heat Stress in Bread Wheat" Agronomy 10, no. 7: 1001. https://doi.org/10.3390/agronomy10071001

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