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

文献类型： 外文期刊

第一作者： Dong, YJ

作者： Dong, YJ;Ogawa, T;Lin, DZ;Koh, HJ;Kamiunten, H;Matsuo, M;Cheng, SH

作者机构：

关键词： rice (Oryza sativa L.);QTLs;Zn2+ toxicity tolerance;molecular marker

期刊名称：FIELD CROPS RESEARCH （ 影响因子：5.224； 五年影响因子：6.19 ）

ISSN： 0378-4290

年卷期： 2006 年 95 卷 2-3 期

页码：

收录情况： SCI

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.

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