Molecular mapping of quantitative trait loci for zinc toxicity tolerance in rice seedling (Oryza sativa L.)

被引:30
|
作者
Dong, YJ [1 ]
Ogawa, T
Lin, DZ
Koh, HJ
Kamiunten, H
Matsuo, M
Cheng, SH
机构
[1] Miyazaki Univ, Fac Agr, Miyazaki 8892192, Japan
[2] Shanghai Normal Univ, Coll Life & Environm Sci, Shanghai 200234, Peoples R China
[3] Seoul Natl Univ, Dept Plant Sci, Seoul 151742, South Korea
[4] China Natl Rice Res Inst, Hangzhou 310006, Peoples R China
基金
日本学术振兴会;
关键词
rice (Oryza sativa L.); QTLs; Zn2+ toxicity tolerance; molecular marker;
D O I
10.1016/j.fcr.2005.03.005
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Excess zinc harms the growth of rice plants and zinc toxicity can easily occur in acid soils. The aim of the study was to map quantitative trait loci (QTLs) in rice for tolerance to zinc toxicity, using a recombinant inbred (RI) population derived from the cross of a japonica variety (Asominori: relatively tolerant to Zn2+ toxicity) with an indica variety (IR24, relatively susceptible), through 289 RFLP markers. The index scores of damage (representing Zn2+ toxicity tolerance), after irrigating rice seedlings with a 1000-ppm Zn2+ solution for 20 successive days, were examined for each RI line and its parental varieties. Continuous distributions and transgressive segregations of the index scores were observed in the RI population, suggesting that Zn2+ toxicity tolerance was a quantitatively inherited trait. Three QTLs for Zn2+ toxicity tolerance were detected on chromosomes 1, 3 and 10 and explained 21.9, 8.9 and 7.6%, respectively, of the total phenotypic variation. The results and the tightly linked molecular markers that flank the QTLs, detected in this study, will be useful in improving Zn2+ tolerance in rice. In addition, the genomic positions between QTLs for Zn2+ toxicity tolerance and the QTLs for other metal (Fe2+, Mn2+, Al3+) toxicity tolerances, from previous studies, are discussed. (c) 2005 Published by Elsevier B.V.
引用
收藏
页码:420 / 425
页数:6
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