Mapping QTL for heat tolerance components and development of SNP markers in wheat (Triticum aestivum L.)
Loading...
Date
2020
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Punjab Agricultural University, Ludhiana
Abstract
Bread wheat (Triticum aestivum L. em. Thell) is an important staple cereal consumed across
the globe. To meet the food requirements of the growing population, wheat production must
increase while addressing the upcoming challenges of which heat stress is increasingly
causing a concern as the global temperature is expected to increase. A meagre increase
beyond the optimum from anthesis to grain filling can result in significant yield losses. The
main aim of this study was to find QTLs for heat tolerance in wheat using Genotyping by
Sequencing (GBS) and thus identifying Single Nucleotide Polymorphism (SNP) for the same.
Around 196 doubled haploid(DH) lines derived from a cross between Sunstar (heat tolerant)
and PBW 343 (heat susceptible) were evaluated under timely sown(normal), late sown and
very late sown conditions (heat stress) at two locations (Ludhiana & Hisar) for two seasons.
Days to flowering (DF), days to maturity (DM), grain filling duration (GFD), plant height
(PH), spike length (SL), number of spikelets/main spike (NSMS), Grain yield (GY),grain
weight/main spike (GWMS), grain number/main spike (NGMS) and hundred grain weight
(HGW) were recorded for three treatments and two years at two locations. Heat susceptibility
index (HSI) of these traits were used as phenotypic data for QTL identification. A total of 16
QTLs were identified on chromosome 2A, 4A, 7A, 1B, 3B, 1D, 3D, 5D & 6D. The QTLs
were detected for DF (1), DM (1), GFD (5), PH (2), NSMS (3), Grain yield (1) and NGMS
(3). Maximum number of QTLs were found on chromosome 3B, followed by 4A, 1B & 1D.
Description
Keywords
Citation
Walia, Puneet (2020). Mapping QTL for heat tolerance components and development of SNP markers in wheat (Triticum aestivum L.). (Unpublished Ph.D. Dissertation). Punjab Agricultural University, Ludhiana, Punjab, India.