Quantitative Trait Loci for Mercury Tolerance in Rice Seedlings

doi:10.1016/S1672-6308(13)60124-9

Abstract

Abstract:

Mercury (Hg) is one of the most toxic heavy metals to living organisms and its conspicuous effect is the inhibition of root growth. However, little is known about the molecular genetic basis for root growth under excess Hg2+ stress. To map quantitative trait loci (QTLs) in rice for Hg2+ tolerance, a population of 120 recombinant inbred lines derived from a cross between two japonica cultivars Yuefu and IRAT109 was grown in 0.5 mmol/L CaCl2 solution. Relative root length (RRL), percentage of the seminal root length in +HgCl2 to –HgCl2, was used for assessing Hg2+ tolerance. In a dose-response experiment, Yuefu had a higher RRL than IRAT109 and showed the most significant difference at the Hg2+ concentration of 1.5 μmol/L. Three putative QTLs for RRL were detected on chromosomes 1, 2 and 5, and totally explained about 35.7% of the phenotypic variance in Hg2+ tolerance. The identified QTLs for RRL might be useful for improving Hg2+ tolerance of rice by molecular marker-assisted selection.

Key words: Hg2+ tolerance, relative root length, quantitative trait locus, rice

WANG Chong-qing1, WANG Tao1, MU Ping2, LI Zi-chao2, YANG Ling1. Quantitative Trait Loci for Mercury Tolerance in Rice Seedlings[J]. RICE SCIENCE, DOI: 10.1016/S1672-6308(13)60124-9 .

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