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http://dx.doi.org/10.7744/cnujas.2011.38.2.199

Mapping QTLs for drought tolerance using an introgression line population from a cross between Ilpumbyeo and Moroberekan in rice  

Kang, Ju-Won (Department of Agronomy, Chungnam National University)
Ju, Hong-Guang (Agricultural Dept., Agricultural college of yanbian Univ.)
Yang, Paul (Department of Agronomy, Chungnam National University)
Ahn, Sang-Nag (Department of Agronomy, Chungnam National University)
Publication Information
Korean Journal of Agricultural Science / v.38, no.2, 2011 , pp. 199-204 More about this Journal
Abstract
This study was conducted to map quantitative trait loci (QTLs) related to drought stress tolerance. An introgression line population derived from a cross, "Ilpum" / "Moroberekan" was used in this study. $F_1$ plants were backcrossed three times to Ilpum to produce $BC_3F_1$ plants. These plants were advanced by selfing for four generation and a total of 117 $BC_3F_5$ introgression lines were developed. These lines were evaluated for percent seed set and spikelets per panicle under the control (field) and drought condition. To identify QTLs related to drought tolerance, 134 SSR markers showing polymorph isms between the parents were genotyped for the 117 $BC_3F_5$ lines. A total of 6 QTLs associated with drought stress were detected on chromosomes 1, 3, 4, 7 and 10. These include two QTLs for phenotypic acceptability, two QTLs for percent seed set ($R^2$ = 19.0 - 20.9%), and two QTLs for spikelets per panicle ($R^2$ = 22.3 - 23.10%). The Moroberekan alleles at three loci contributed the positive effect for drought tolerance. The SSR markers linked to drought stress tolerance can not only facilitate the selection of valuable genes from Moroberekan, but also allow identification of lines with drought tolerance.
Keywords
Drought tolerance; QTLs; Rice; Introgression line;
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