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Association analysis for agronomic traits in wheat under terminal heat stress

Khan, Adeel and Ahmad, Munir and Ahmed, Mukhtar and Gill, Kulvinder Singh and Akram, Zahid (2021). Association analysis for agronomic traits in wheat under terminal heat stress. Saudi Journal of Biological Sciences. 28 , 7404-7415
[Research article]

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Abstract

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 pat-tern had highest significant (P < 0.001) linked loci pairs 732 on genome A at r(2) > 0.1 whereas, 58 on gen-ome B at r(2) > 0.5. Linkage disequilibrium decay (P < 0.01 and r(2) > 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 facil-itate in MAS and gene pyramiding against heat stress in wheat. (C) 2021 Published by Elsevier B.V. on behalf of King Saud University.

Authors/Creators:Khan, Adeel and Ahmad, Munir and Ahmed, Mukhtar and Gill, Kulvinder Singh and Akram, Zahid
Title:Association analysis for agronomic traits in wheat under terminal heat stress
Series Name/Journal:Saudi Journal of Biological Sciences
Year of publishing :2021
Volume:28
Page range:7404-7415
Number of Pages:12
Publisher:ELSEVIER
ISSN:1319-562X
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Agricultural Science
Keywords:Terminal heat stress, Wheat, Marker assisted selection, Gene pyramiding
URN:NBN:urn:nbn:se:slu:epsilon-p-114658
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-114658
Additional ID:
Type of IDID
DOI10.1016/j.sjbs.2021.08.050
Web of Science (WoS)000720913000003
ID Code:26295
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Agricultural Research for Northern Sweden
(VH) > Dept. of Agricultural Research for Northern Sweden
Deposited By: SLUpub Connector
Deposited On:09 Dec 2021 17:25
Metadata Last Modified:09 Dec 2021 17:31

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