Identification of quantitative trait loci for Cd and Zn concentrations of brown rice grown in Cd-polluted soils |
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| Authors: | Xiaoqin Zhang Guoping Zhang Longbiao Guo Huizhong Wang Dali Zeng Guojun Dong Qian Qian and Dawei Xue |
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| Institution: | (1) College of Life and Environment Sciences, Hangzhou Normal University, Hangzhou, 310036, China;(2) Agronomy Department, Zhejiang University, Hangzhou, 310029, China;(3) State Key Laboratory of Rice Biology, China National Rice Research Institute, Hangzhou, 310006, China; |
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| Abstract: | Low grain cadmium (Cd) and high grain zinc (Zn) rice cultivars have become the current rice breeding objectives. However,
the genetic control of Cd and Zn concentrations in brown rice remains poorly understood, especially when grown in Cd-contaminated
soil. In this study, quantitative trait loci (QTLs) associated with grain Cd and Zn concentrations and Cd/Zn ratio were identified
using a doubled haploid population derived from a cross between japonica JX17 and indica ZYQ8 rice cultivars. Three and two QTLs were detected for Cd and Zn concentration in brown rice, respectively. Two QTLs associated
with grain Cd/Zn ratio on chromosomes 3 and 6 were initially mapped. These QTLs accounted for 10.83–41.66% of the total variance
of the three traits measured. Only one common locus on chromosome 6 was found for Cd concentration and Cd/Zn ratio. The lack
of co-location of the QTLs for Cd and Zn concentrations in this mapping population suggests different genetic mechanisms.
In summary, our results provide insight into the genetic basis of rice grain Cd and Zn accumulation; the isolated QTLs may
be useful for marker-assisted selection and identification of genes associated with Cd and Zn accumulation in rice. |
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