Tan Yongjun, Zhou Jieqiang, Wang Jiurong, Sun Liang
Key Laboratory of Agro-Ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, China.
University of Chinese Academy of Science, Beijing, China.
Front Plant Sci. 2020 Feb 25;11:12. doi: 10.3389/fpls.2020.00012. eCollection 2020.
The ionome of the rice grain is crucial for the health of populations that consume rice as a staple food. However, the contribution of phenotypic plasticity to the variation of rice grain ionome and the genetic architecture of phenotypic plasticity are poorly understood. In this study, we investigated the rice grain ionome of a rice diversity panel in up to eight environments. A considerable proportion of phenotypic variance can be attributed to phenotypic plasticity. Then, phenotypic plasticity and mean phenotype were quantified using Bayesian Finlay-Wilkinson regression, and a significant correlation between them was observed. However, the genetic architecture of mean phenotype was distinct from that of phenotypic plasticity. Also, the correlation between them was mainly attributed to the phenotypic divergence between rice subspecies. Furthermore, the results of whole-genome regression analysis showed that the genetic loci related to phenotypic plasticity can explain a considerable proportion of the phenotypic variance in some environments, especially for Cd, Cu, Mn, and Zn. Our study not only sheds light on the genetic architecture of phenotypic plasticity of the rice grain ionome but also suggests that the genetic loci which related to phenotypic plasticity are valuable in rice grain ionome improvement breeding.
水稻籽粒的离子组对于以水稻为主食的人群的健康至关重要。然而，表型可塑性对水稻籽粒离子组变异的贡献以及表型可塑性的遗传结构尚不清楚。在本研究中，我们在多达八种环境中研究了一个水稻多样性群体的水稻籽粒离子组。相当一部分表型变异可归因于表型可塑性。然后，使用贝叶斯芬利-威尔金森回归对表型可塑性和平均表型进行量化，并观察到它们之间存在显著相关性。然而，平均表型的遗传结构与表型可塑性的遗传结构不同。此外，它们之间的相关性主要归因于水稻亚种之间的表型差异。此外，全基因组回归分析结果表明，与表型可塑性相关的遗传位点在某些环境中可以解释相当比例的表型变异，特别是对于镉、铜、锰和锌。我们的研究不仅揭示了水稻籽粒离子组表型可塑性的遗传结构，还表明与表型可塑性相关的遗传位点在水稻籽粒离子组改良育种中具有重要价值。
