Genetic Diversity, Rather than Cultivar Type, Determines Relative Grain Cd Accumulation in Hybrid Rice.
Genetic Diversity, Rather than Cultivar Type, Determines Relative Grain Cd Accumulation in Hybrid Rice.
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遗传多样性而非品种类型决定了杂交水稻籽粒镉的相对积累
DOI：
10.3389/fpls.2016.01407
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发表时间：
2016
影响因子：
5.6
通讯作者：
Chen C
中科院分区：
文献类型：
--
作者：
Sun L;Xu X;Jiang Y;Zhu Q;Yang F;Zhou J;Yang Y;Huang Z;Li A;Chen L;Tang W;Zhang G;Wang J;Xiao G;Huang D;Chen C
镉（Cd）是一种有毒元素，对于以大米为主要热量来源的人来说，大米是膳食Cd的主要来源。杂交水稻在中国南方的水稻生产中占主导地位，并已在世界范围内被采用。水稻杂交种的高产优势特点使人们直观地认为杂交稻在籽粒中积累的镉比自交稻多。深入了解杂交水稻籽粒镉积累的遗传基础，培育镉安全型水稻是当前杂交水稻育种工作者的首要任务之一。本研究以长江中下游地区617个水稻杂交种和世界各地68个水稻自交系为材料，分析了它们的遗传多样性和籽粒镉含量。我们发现，有很大的差异，在籽粒镉积累的杂交种和自交系。然而，我们发现，在水稻杂交种的粮食镉水平是相似的水平在籼稻自交系，这表明杂交种不积累更多的镉比自交系水稻品种。进一步分析表明，籽粒Cd积累量的高遗传力和籼型群体结构的单一性增加了杂交水稻Cd过量积累的风险。在相关的Cd-QTL定位研究中已经确定的Cd相关QTL的遗传效应也在杂交水稻群体中进行了测定。4个QTL被确定为与籽粒镉水平的变化，这些位点中的3个表现出明显的籼粳分化。本研究为进一步了解杂交水稻籽粒镉积累规律提供了理论依据，为今后选育高产、低镉杂交水稻品种奠定了基础。
Cadmium (Cd) is a toxic element, and rice is known to be a leading source of dietary Cd for people who consume rice as their main caloric resource. Hybrid rice has dominated rice production in southern China and has been adopted worldwide. The characteristics of high yield heterosis of rice hybrids makes the public think intuitively that the hybrid rice accumulates more Cd in grain than do inbred cultivars. A detailed understanding of the genetic basis of grain Cd accumulation in hybrids and developing Cd-safe rice are one of the top priorities for hybrid rice breeders at present. In this study, we investigated genetic diversity and grain Cd levels in 617 elite rice hybrids collected from the middle and lower Yangtze River Valley in China and 68 inbred cultivars from around the world. We found that there are large variations in grain Cd accumulation in both the hybrids and their inbred counterparts. However, we found grain Cd levels in the rice hybrids to be similar to the levels in indica rice inbreds, suggesting that the hybrids do not accumulate more Cd than do the inbred rice cultivars. Further analysis revealed that the high heritability of Cd accumulation in the grain and the single indica population structure increases the risk of Cd over-accumulation in hybrid rice. The genetic effects of Cd-related QTLs, which have been identified in related Cd-QTL mapping studies, were also determined in the hybrid rice population. Four QTLs were identified as being associated with the variation in grain Cd levels; three of these loci exhibited obvious indica-japonica differentiations. Our study will provide a better understanding of grain Cd accumulations in hybrid rice, and pave the way toward effective breeding for high-yielding, low grain-Cd hybrids in the future.
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影响因子：
6.2
作者：
Rao, Yuchun;Li, Yuanyuan;Qian, Qian
通讯作者：
Qian, Qian
影响因子：
5.8
作者：
Bradbury, Peter J.;Zhang, Zhiwu;Buckler, Edward S.
通讯作者：
Buckler, Edward S.
影响因子：
6.9
作者：
Ishikawa S;Abe T;Kuramata M;Yamaguchi M;Ando T;Yamamoto T;Yano M
通讯作者：
Yano M
影响因子：
4.9
作者：
Li, ZW;Li, LQ;Chen, J
通讯作者：
Chen, J
影响因子：
2.5
作者：
He, Junyu;Zhu, Cheng;Jiang, Dean
通讯作者：
Jiang, Dean