Molecular and morphological characterization for heat stress tolerance of bread wheat (Triticum aestivum L.) genotypes

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dc.contributor.advisorSaini, Johar Singh
dc.contributor.authorArshdeep Kaur
dc.date.accessioned2022-11-11T12:56:41Z
dc.date.available2022-11-11T12:56:41Z
dc.date.issued2022
dc.description.abstractWheat is cold loving crop and rising temperature especially at terminal stage is becoming constraint in wheat production to meet the food security. Plant breeders throughout the world are in continuous endeavour to develop superior wheat phenotypes that are better adapted to heat stress conditions by utilizing the available genetic variation. However, most of the heat related traits are quantitative in nature and controlled by large number of QTLs/genes. Therefore, present study was conducted with the aim to identify the presence of premapped QTLs in a set of 24 lines, which comprises of 19 heat tolerant lines for various complementary traits. Field evaluation of these lines was done by sowing on three different dates i.e. timely sown (D1), late sown (Date2) and very late sown (Date3) conditions in 4 replications. Data were collected on different plant morphological and reproductive traits viz; Grain yield (GY), Tiller Number (TN), Total biomass (TB), Grain number per spike (GNS), Vigour (Vi), Spikelet fertility (SF), Plant Height (PHE), Days to Maturity (DMA), Days to Heading (DHE) and Germination percentage (G%). Heat susceptibility indices were estimated to assess the susceptibility of these traits to the heat stress. Forty one SSR markers that were previously reported for heat QTLs were used to identify the lines for presence of the QTLs. Maximum number of QTLs were detected in chromosome 2A followed by 5B. Heat susceptibility indices of various phenotypic traits were compared with the presence of heat QTLs in the lines. It was found that for majority of the QTLs the lines showed HSI indices below 1.00, signifying the effect of the QTLs on the phenotypic performance. To validate these premapped QTLs a Doubled haploid population between KSG1196 and PBW343 used for segregation analysis. Chi square analysis in population revealed that, three out of four markers fit the segregation ratio, thus showing that QTLs can be used for further transfer or pyramiding without linkage drag.en_US
dc.identifier.citationArshdeep Kaur (2022). Molecular and morphological characterization for heat stress tolerance of bread wheat (Triticum aestivum L.) genotypes (Unpublished M.Sc. thesis). Punjab Agricultural University, Ludhiana, Punjab, India.en_US
dc.identifier.urihttps://krishikosh.egranth.ac.in/handle/1/5810189770
dc.keywordsHeat susceptibility index, phenotype, temperature, QTLsen_US
dc.language.isoEnglishen_US
dc.pages56en_US
dc.publisherPunjab Agricultural University, Ludhianaen_US
dc.research.problemMolecular and morphological characterization for heat stress tolerance of bread wheat (Triticum aestivum L.) genotypesen_US
dc.subGenetics and Plant Breedingen_US
dc.themeMolecular and morphological characterization for heat stress tolerance of bread wheat (Triticum aestivum L.) genotypesen_US
dc.these.typeM.Scen_US
dc.titleMolecular and morphological characterization for heat stress tolerance of bread wheat (Triticum aestivum L.) genotypesen_US
dc.typeThesisen_US
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