Genome wide association mapping for heat tolerance in maize (Zea mays L.)
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Date
2019
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Punjab Agricultural University, Ludhiana
Abstract
The present investigation entitled “Genome wide association mapping for heat tolerance in maize (Zea mays L.)” was carried out at Punjab Agricultural University, Ludhiana during spring, 2016 and 2017 under optimal and heat stress conditions. Substantial significant variability was observed in the association mapping panel for heat associated traits under both the conditions. These traits were significantly affected by high temperature stress. Under heat stress, anthesis-silking interval (ASI) prolonged and some genotypes had no silk emergence. Average grain yield (3.46 t/ha) was low compared to that under optimal condition. Broad-sense heritability ranged from low to high in both conditions. The traits viz., days to 50% anthesis (AD) and silking (SD) and anthesis-silking interval (ASI) had significantly negative association with grain yield while plant and ear height and ear position showed significant positive correlation with grain yield. In 2016, 2017 and pooled over both years, total 159, 154 and 130 SNPs, respectively, were found associated with these traits under optimal condition. However, under heat stress, total 182, 109 and 71 SNPs were found associated with these traits during 2016, 2017 and pooled condition, respectively. Out of these, 7 and 9, SNPs was found associated with more than one trait under optimal condition while 23 and 11, SNPs under heat stress condition in 2016 and 2017, respectively. Similarly, total 122 and 123 haplotype blocks were associated with these traits individually while 20 and 6 haplotype blocks with more than one trait under optimal and heat stress conditions, respectively. Eighty one DH lines were found promising in both the conditions and were found associated with favorable alleles of significant SNPs and haplotype blocks for heat associated traits.
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