Chen Yi-Bo, Chen Yu-Chao, Zhu Yu-Xing, Li Sai, Deng Hua-Bing, Wang Jiu-Rong, Tang Wen-Bang, Sun Liang
College of Agronomy, Hunan Agricultural University, Changsha, China.
Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, China.
Front Plant Sci. 2021 Feb 19;12:638095. doi: 10.3389/fpls.2021.638095. eCollection 2021.
Rice, a staple crop for nearly half the planet's population, tends to absorb and accumulate excessive cadmium (Cd) when grown in Cd-contaminated fields. Low levels of Cd can degrade the quality of rice grains, while high levels can inhibit the growth of rice plants. There is genotypic diversity in Cd distribution and Cd tolerance in different rice varieties, but their underlying genetic mechanisms are far from elucidated, which hinders genetic improvements. In this study, a joint study of phenotypic investigation with quantitative trait loci (QTLs) analyses of genetic patterns of Cd distribution and Cd tolerance was performed using a biparent population derived from and rice varieties. We identified multiple QTLs for each trait and revealed that additive effects from various loci drive the inheritance of Cd distribution, while epistatic effects between various loci contribute to differences in Cd tolerance. One pleiotropic locus, , was found to affect the Cd distribution from both roots to shoots and from leaf sheaths to leaf blades. The results expand our understanding of the diversity of genetic control over Cd distribution and Cd tolerance in rice. The findings provide information on potential QTLs for genetic improvement of Cd distribution in rice varieties.
水稻是全球近一半人口的主食作物，在镉污染土壤中种植时，往往会吸收和积累过量的镉（Cd）。低水平的镉会降低稻米品质，而高水平的镉会抑制水稻植株生长。不同水稻品种在镉分布和耐镉性方面存在基因型差异，但其潜在遗传机制尚不清楚，这阻碍了遗传改良。本研究利用由两个水稻品种构建的双亲群体，对镉分布和耐镉性的遗传模式进行了表型调查和数量性状位点（QTL）分析的联合研究。我们鉴定出了每个性状的多个QTL，并揭示了不同位点的加性效应驱动镉分布的遗传，而不同位点间的上位性效应导致耐镉性差异。发现一个多效性位点影响从根到地上部以及从叶鞘到叶片的镉分布。这些结果扩展了我们对水稻镉分布和耐镉性遗传控制多样性的理解。这些发现为水稻品种镉分布遗传改良的潜在QTL提供了信息。
