Genome‐wide association mapping for phenotypic plasticity in rice. (2nd June 2017)

• Record Type: Journal Article
• Authors: Kikuchi, Shinji; Bheemanahalli, Raju; Jagadish, Krishna S.V.; Kumagai, Etsushi; Masuya, Yusuke; Kuroda, Eiki; Raghavan, Chitra; Dingkuhn, Michael; Abe, Akira; Shimono, Hiroyuki
• Is Part Of: Plant, cell and environment. Volume 40:Number 8(2017)
• Page Start: 1565
• Page End: 1575
• Publication Date: 2017-06-02
• Subjects: climate change -- elevated carbon dioxide -- genome‐wide association study -- phenotypic plasticity -- rice; Plant physiology -- Periodicals; Plant cells and tissues -- Periodicals; Plant communities -- Periodicals; 581.105
• DOI: 10.1111/pce.12955
• Languages: English
• ISSNs: 0140-7791

Abstract

Abstract: 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 CO2 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 threeE nvironmentalR esponsiveness (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 CO2 in Japan. Our study provides evidence for polymorphisms that control rice phenotypic plasticity in environments that are rich in resources such as light and CO2 . Abstract : Genome‐wide association studies revealed three candidate alleles (qER1–3) that were associated with relative response of panicle weight to low density under field conditions in the Philippines. Two of these alleles were tested in 13 genotypes to clarify their biomass responses to elevated atmospheric CO2 concentration during vegetative growth in sunlit temperature‐gradient chambers in Japan. Our study provides evidence for polymorphisms that control rice phenotypic plasticity in environments that are rich in resources such as light and CO2 . The phenotyping approach involving a large number of genotypes by employing planting density as a proxy for the response to elevated [CO2 ] followed by more precise validation on a smaller number of promising genotypes using elevated [CO2 ] facilities is a promising strategy for identifying candidate accessions with high responsiveness to [CO2 ].