CHARACTERIZATION OF TRAIT SPECIFIC RIL TO MAP QTL AND IDENTIFY SUPERIOR TRAIT INTROGRESSED LINES IN RICE (Oryza sativa L.)
| dc.contributor.advisor | SHESHSHAYEE, M S | |
| dc.contributor.author | POOJA, BHARTI | |
| dc.date.accessioned | 2016-10-27T13:05:21Z | |
| dc.date.available | 2016-10-27T13:05:21Z | |
| dc.date.issued | 02-07-14 | |
| dc.description.abstract | With the receding water availability, saving water from rice cultivation while sustaining productivity is essential. This necessitates development of rice cultivars suitable for semi-irrigated aerobic cultivation. Introgressing water acquisition and its efficient use for biomass production have been demonstrated to have great significance in improving productivity. Towards identifying superior trait introgressed lines, a mapping population comprising of 230 recombinant inbred lines developed by crossing Thanu (high WUE) and IET 15963 (high root) was phenotyped for variability in WUE based Δ13C, yield and spikelet associated traits under aerobic condition. The population was genotyped with 82 polymorphic SSR markers reported to be linked with yield under drought and other related traits. A genetic linkage map was constructed with a total of 115 which included 62 markers from a previous study. QTLs for important traits like yield under drought, WUE, roots and traits associated with spikelet fertility were discovered. The combined approach of previous association mapping and present linkage mapping lead to the identification of two common markers viz., RM180 and RM307 linked with Δ13C and root length, respectively. These markers can significantly enhance breeding efficiency while introgressing complex traits. Several transgressive segregants with improved root traits and WUE were identified. Graphical genotyping of these introgression lines with 115 markers revealed the integration of trait donor genomes. The performance of these selected transgressive segregants was significantly superior compared with the parental lines as evidenced by a grametric experiment. The investigation provided a proof of concept that introgression of root and WUE traits is essential for sustaining rice productivity while saving substantial amounts of water by growing them under semi-irrigated aerobic conditions. | en_US |
| dc.identifier.other | TH-10752 | |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/82514 | |
| dc.language.iso | en | en_US |
| dc.publisher | University of Agricultural Sciences GKVK, Bangalore | en_US |
| dc.sub | Crop Physiology | en_US |
| dc.subject | irrigation, vegetative propagation, rice, planting, yields, biological phenomena, weather hazards, genetics, selection, introgression | en_US |
| dc.title | CHARACTERIZATION OF TRAIT SPECIFIC RIL TO MAP QTL AND IDENTIFY SUPERIOR TRAIT INTROGRESSED LINES IN RICE (Oryza sativa L.) | en_US |
| dc.type | Thesis | en_US |