Identification of quantitative trait loci for Cd and Zn concentrations of brown rice grown in Cd-polluted soils
Identification of quantitative trait loci for Cd and Zn concentrations of brown rice grown in Cd-polluted soils
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镉污染土壤中糙米镉、锌含量数量性状位点鉴定
DOI：
10.1007/s10681-011-0346-9
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发表时间：
2011-01
期刊：
影响因子：
1.9
通讯作者：
郭龙彪
中科院分区：
文献类型：
--
作者：
郭龙彪
低粒镉、高粒锌水稻品种已成为当前水稻育种的目标。然而，遗传控制的镉和锌浓度在糙米仍然知之甚少，特别是当生长在镉污染的土壤。本研究以粳稻JX 17和籼稻ZYQ 8杂交的双单倍体群体为材料，分析了与籽粒Cd、Zn含量及Cd/Zn比值相关的数量性状位点（QTL）。糙米中Cd和Zn含量分别检测到3个和2个QTL。初步定位了位于第3和第6染色体上的两个与籽粒Cd/Zn比值相关的QTL。这些QTL对3个性状总方差的贡献率为10.83-41.66%。Cd浓度和Cd/Zn比值在第6染色体上只有一个共同位点。在该作图群体中，Cd和Zn含量的QTL没有共定位，表明不同的遗传机制。总之，本研究结果为水稻籽粒Cd和Zn积累的遗传基础提供了新的思路，为分子标记辅助选择和鉴定水稻Cd和Zn积累相关基因提供了新的思路。
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 betweenjaponicaJX17 andindicaZYQ8 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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