Association analysis for agronomic traits in wheat under terminal heat stress

Terminal heat stress causes irreversible damage to wheat crop productivity. It reduces the vegetative growth and flowering period that consequently declines the efficiency to capture available stem reserves (carbohydrates) in grains. Markers associated with thermotolerant traits ease in marker assis...

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Autores principales:	Adeel Khan, Munir Ahmad, Mukhtar Ahmed, Kulvinder Singh Gill, Zahid Akram
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Terminal heat stress Wheat Marker assisted selection Gene pyramiding Biology (General) QH301-705.5
Acceso en línea:	https://doaj.org/article/a8f854dcd5764919b1ec2a8277a4eda2
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spelling	oai:doaj.org-article:a8f854dcd5764919b1ec2a8277a4eda22021-11-20T04:57:10ZAssociation analysis for agronomic traits in wheat under terminal heat stress1319-562X10.1016/j.sjbs.2021.08.050https://doaj.org/article/a8f854dcd5764919b1ec2a8277a4eda22021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1319562X21007397https://doaj.org/toc/1319-562XTerminal heat stress causes irreversible damage to wheat crop productivity. It reduces the vegetative growth and flowering period that consequently declines the efficiency to capture available stem reserves (carbohydrates) in grains. Markers associated with thermotolerant traits ease in marker assisted selection (MAS) for crop improvement. It identifies the genomic regions associated with thermotolerant traits in wheat, but the scarcity of markers is the major hindrance in crop improvement. Therefore, 158 wheat genotypes were subjected to genotyping with 165 simple sequence repeat markers dispersed on three genomes (A, B and D). Allelic frequency and polymorphic information content values were highest on genome A (5.34 (14% greater than the lowest value at genome D) and 0.715 (3% greater than the lowest value at genome D)), chromosome 4 (5.40 (16% greater than the lowest value at chromosome 2) and 0.725 (5% greater than the lowest value at chromosome 6)) and marker xgwm44 (13.0 (84% greater than the lowest value at marker xbarc148) and 0.916 (46% greater than the lowest value at marker xbarc148)). Bayesian based population structure discriminated the wheat genotypes into seven groups based on genetic similarity indicating their ancestral origin and geographical ecotype. Linkage disequilibrium pattern had highest significant (P < 0.001) linked loci pairs 732 on genome A at r2 > 0.1 whereas, 58 on genome B at r2 > 0.5. Linkage disequilibrium decay (P < 0.01 and r2 > 0.1) had larger LD block (5–10 cM) on genome A. Highly significant MTAs (P < 0.000061) under heat stress conditions were identified for flag leaf area (xwmc336), spikelet per spike (xwmc553), grains per spike (cxfa2147, xwmc418 and xwmc121), biomass (xbarc7) and grain yield (xcfa2147 and xwmc671). The identified markers in this study could facilitate in MAS and gene pyramiding against heat stress in wheat.Adeel KhanMunir AhmadMukhtar AhmedKulvinder Singh GillZahid AkramElsevierarticleTerminal heat stressWheatMarker assisted selectionGene pyramidingBiology (General)QH301-705.5ENSaudi Journal of Biological Sciences, Vol 28, Iss 12, Pp 7404-7415 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Terminal heat stress Wheat Marker assisted selection Gene pyramiding Biology (General) QH301-705.5
spellingShingle	Terminal heat stress Wheat Marker assisted selection Gene pyramiding Biology (General) QH301-705.5 Adeel Khan Munir Ahmad Mukhtar Ahmed Kulvinder Singh Gill Zahid Akram Association analysis for agronomic traits in wheat under terminal heat stress
description	Terminal heat stress causes irreversible damage to wheat crop productivity. It reduces the vegetative growth and flowering period that consequently declines the efficiency to capture available stem reserves (carbohydrates) in grains. Markers associated with thermotolerant traits ease in marker assisted selection (MAS) for crop improvement. It identifies the genomic regions associated with thermotolerant traits in wheat, but the scarcity of markers is the major hindrance in crop improvement. Therefore, 158 wheat genotypes were subjected to genotyping with 165 simple sequence repeat markers dispersed on three genomes (A, B and D). Allelic frequency and polymorphic information content values were highest on genome A (5.34 (14% greater than the lowest value at genome D) and 0.715 (3% greater than the lowest value at genome D)), chromosome 4 (5.40 (16% greater than the lowest value at chromosome 2) and 0.725 (5% greater than the lowest value at chromosome 6)) and marker xgwm44 (13.0 (84% greater than the lowest value at marker xbarc148) and 0.916 (46% greater than the lowest value at marker xbarc148)). Bayesian based population structure discriminated the wheat genotypes into seven groups based on genetic similarity indicating their ancestral origin and geographical ecotype. Linkage disequilibrium pattern had highest significant (P < 0.001) linked loci pairs 732 on genome A at r2 > 0.1 whereas, 58 on genome B at r2 > 0.5. Linkage disequilibrium decay (P < 0.01 and r2 > 0.1) had larger LD block (5–10 cM) on genome A. Highly significant MTAs (P < 0.000061) under heat stress conditions were identified for flag leaf area (xwmc336), spikelet per spike (xwmc553), grains per spike (cxfa2147, xwmc418 and xwmc121), biomass (xbarc7) and grain yield (xcfa2147 and xwmc671). The identified markers in this study could facilitate in MAS and gene pyramiding against heat stress in wheat.
format	article
author	Adeel Khan Munir Ahmad Mukhtar Ahmed Kulvinder Singh Gill Zahid Akram
author_facet	Adeel Khan Munir Ahmad Mukhtar Ahmed Kulvinder Singh Gill Zahid Akram
author_sort	Adeel Khan
title	Association analysis for agronomic traits in wheat under terminal heat stress
title_short	Association analysis for agronomic traits in wheat under terminal heat stress
title_full	Association analysis for agronomic traits in wheat under terminal heat stress
title_fullStr	Association analysis for agronomic traits in wheat under terminal heat stress
title_full_unstemmed	Association analysis for agronomic traits in wheat under terminal heat stress
title_sort	association analysis for agronomic traits in wheat under terminal heat stress
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/a8f854dcd5764919b1ec2a8277a4eda2
work_keys_str_mv	AT adeelkhan associationanalysisforagronomictraitsinwheatunderterminalheatstress AT munirahmad associationanalysisforagronomictraitsinwheatunderterminalheatstress AT mukhtarahmed associationanalysisforagronomictraitsinwheatunderterminalheatstress AT kulvindersinghgill associationanalysisforagronomictraitsinwheatunderterminalheatstress AT zahidakram associationanalysisforagronomictraitsinwheatunderterminalheatstress
_version_	1718419732790509568

Association analysis for agronomic traits in wheat under terminal heat stress

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