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QTL identification for yield components under low P and water condition from indica x japonica RILs
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/297675
This study aims to identify major quantitative trait loci (QTL) for yield components under low-input systems in tropical regions in rice. A total of 156 highly advanced recombinant inbred lines (RILs) have been developed from a cross between two temperate rice varieties, Dasanbyeo (Tongil-type indica) and TR22183 (japonica). Both parental lines and RILs were tested under two different regimes of irrigation and phosphorus (P) application levels. During the wet season of 2012, under mild drought conditions, TR22183 showed more vigorous root growth at 15 days after sowing than Dasanbyeo. The early root establishment of TR22183 may have contributed to the enhanced P uptake from the top soil in the early growth stage. The linkage map for DT-RILs was constructed with 312 single nucleotide polymorphism markers aided by 384-plex platform of BeadXpress high-throughput genotyping system. For the vegetative growth, major QTLs on chromsome 6 for plant height and tiller numbers were identified. For the grain yield related traits, major QTLs on chromsome 2 were closely linked to each other. On the other hand, panicle length QTLs were identified on chromsomes 2 and 9. We are currently analyzing phenotypic data and the experiment is being repeated in dry season and temperate region.
