Faculty of Agriculture, Iwate University, 3-18-8 Ueda, Morioka, Iwate, 020-8550, Japan.
Crop and Environmental Sciences Division, International Rice Research Institute, DAPO Box 7777, Metro Manila, the Philippines.
Plant Cell Environ. 2017 Aug;40(8):1565-1575. doi: 10.1111/pce.12955. Epub 2017 Jun 2.
Phenotypic plasticity of plants in response to environmental changes is important for adapting to changing climate. Less attention has been paid to exploring the advantages of phenotypic plasticity in resource-rich environments to enhance the productivity of agricultural crops. Here, we examined genetic variation for phenotypic plasticity in indica rice (Oryza sativa L.) across two diverse panels: (1) a Phenomics of Rice Adaptation and Yield (PRAY) population comprising 301 accessions; and (2) a Multi-parent Advanced Generation Inter-Cross (MAGIC) indica population comprising 151 accessions. Altered planting density was used as a proxy for elevated atmospheric CO response. Low planting density significantly increased panicle weight per plant compared with normal density, and the magnitude of the increase ranged from 1.10 to 2.78 times among accessions for the PRAY population and from 1.05 to 2.45 times for the MAGIC population. Genome-wide-association studies validate three Environmental Responsiveness (ER) candidate alleles (qER1-3) that were associated with relative response of panicle weight to low density. Two of these alleles were tested in 13 genotypes to clarify their biomass responses during vegetative growth under elevated CO in Japan. Our study provides evidence for polymorphisms that control rice phenotypic plasticity in environments that are rich in resources such as light and CO .
植物对环境变化的表型可塑性对于适应气候变化非常重要。然而，人们对探索资源丰富环境中表型可塑性的优势以提高农业作物生产力的关注较少。在这里，我们研究了两个不同群体中的籼稻（Oryza sativa L.）表型可塑性的遗传变异：（1）一个包含 301 个品系的水稻适应和产量表型组学（PRAY）群体；（2）一个包含 151 个品系的多亲本高级世代互交（MAGIC）籼稻群体。改变种植密度被用作升高大气 CO 响应的替代物。与正常密度相比，低密度显著增加了每株的穗重，在 PRAY 群体中，穗重的增加幅度在品系间的范围为 1.10 到 2.78 倍，在 MAGIC 群体中为 1.05 到 2.45 倍。全基因组关联研究验证了与穗重对低密度的相对响应相关的三个环境响应（ER）候选等位基因（qER1-3）。这三个等位基因中的两个在 13 个基因型中进行了测试，以阐明它们在日本升高 CO 条件下的营养生长期间的生物量响应。我们的研究提供了证据表明，在资源丰富的环境中，如光和 CO，控制水稻表型可塑性的多态性。
