IDENTIFICATION AND VALIDATION OF QTL CONTROLLING TRAITS RELATED TO DROUGHT TOLERANCE IN THE RECOMBINANT INBRED POPULATION OF THE CROSS NRCG 12568 × NRCG 12326 IN GROUNDNUT (Arachis hypogaea L.)
dc.contributor.advisor | D. L. SAVITHRAMMA | |
dc.contributor.author | BHARATH KUMAR P. JAMBAGI | |
dc.date.accessioned | 2023-01-05T08:30:00Z | |
dc.date.available | 2023-01-05T08:30:00Z | |
dc.date.issued | 2022-12-28 | |
dc.description.abstract | An investigation was carried out with the experimental material consisting of 147 RILs developed from the cross NRCG-12568 × NRCG-12326 during summer 2017 and 2018 at GKVK, Bengaluru under four different conditions viz., Well-watered (WW), Water stress (WS) I -with holding irrigation from 30-45 DAS (flowering period), Water stress II -with holding irrigation from 45-65 DAS (flowering and peg initiation stage), water stress III -with holding irrigation from 65-85 DAS (peg penetration and pod development stage) in augmented design including checks; TMV-2 and GKVK-5. Significant differences among RILs were observed for most of the traits in both the conditions. SCMR, SLA, pods plant-1 and pod yield plant-1 showed more genetic variation exhibiting moderate to high heritability with high genetic advance. Four out of 15 drought tolerant indices tested viz., MP, GMP, HMP and STI were found to be better indicators of drought tolerance. RIL133, RIL126, RIL145 and RIL25 showed higher pod yield in WW and WS conditions in comparison to GKVK 5 across years and locations based on per se performance, biplot analysis and ranking method. A linkage map was developed with 172 SSR markers on 20 linkage groups using genotypic data of 147 RILs. The length of linkage map spanned 2212.87 cM with an average of 11.12 cM inter-maker distance. Twenty-one QTLs were detected with 6.27-13.55% of phenotypic variance explained (PVE) in WW and WS environments. Two major QTLs each for SCMR and days to 50 per cent flowering, three major QTLs for SLA were detected in WS condition at LOD 3.0. A total of 38 Di-QTL interactions with more than 5% PVE were identified at LOD 5.0. The QTLs identified in the study can be utilized for marker assisted back cross breeding after validation. Stable RILs can be tested in multilocations or could be used infuture breeding for drought tolerance. | en_US |
dc.identifier.uri | https://krishikosh.egranth.ac.in/handle/1/5810191289 | |
dc.keywords | genetic variation exhibiting moderate, High heritability with high genetic advance | en_US |
dc.language.iso | English | en_US |
dc.pages | 252 | en_US |
dc.publisher | University of Agricultural Sciences, Bangalore | en_US |
dc.sub | Genetics and Plant Breeding | en_US |
dc.theme | DROUGHT TOLERANCE IN THE RECOMBINANT INBRED POPULATION OF THE CROSS NRCG 12568 × NRCG 12326 IN GROUNDNUT | en_US |
dc.these.type | Ph.D | en_US |
dc.title | IDENTIFICATION AND VALIDATION OF QTL CONTROLLING TRAITS RELATED TO DROUGHT TOLERANCE IN THE RECOMBINANT INBRED POPULATION OF THE CROSS NRCG 12568 × NRCG 12326 IN GROUNDNUT (Arachis hypogaea L.) | en_US |
dc.type | Thesis | en_US |