Mapping QTL for heat tolerance components and development of SNP markers in wheat (Triticum aestivum L.)

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dc.contributor.advisorSaini, Johar Singh
dc.contributor.authorWalia, Puneet
dc.date.accessioned2020-10-23T09:48:14Z
dc.date.available2020-10-23T09:48:14Z
dc.date.issued2020
dc.description.abstractBread 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.en_US
dc.identifier.citationWalia, 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 (Unpublished Ph.D. Dissertation).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.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810153714
dc.keywordsHeat stress, Genotyping by Sequencing, Single Nucleotide Polymorphism, QTLsen_US
dc.language.isoEnglishen_US
dc.pages73en_US
dc.publisherPunjab Agricultural University, Ludhianaen_US
dc.research.problemMapping QTL for heat tolerance components and development of SNP markers in wheat (Triticum aestivum L.)en_US
dc.subGenetics and Plant Breedingen_US
dc.themeMapping QTL for heat tolerance components and development of SNP markers in wheat (Triticum aestivum L.)en_US
dc.these.typePh.Den_US
dc.titleMapping QTL for heat tolerance components and development of SNP markers in wheat (Triticum aestivum L.)en_US
dc.typeThesisen_US
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