High temperature and low solar radiation during ripening differentially affect the composition of milky-white grains in rice (Oryza sativa L.)
| Autor: | Yukinori Nakayama, Takayuki Umemoto, Noriaki Aoki, Motohiko Kondo, Akihiro Ohsumi, Satoshi Yoshinaga, Tsutomu Ishimaru, Keitaro Suzuki |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
Starch seed storage proteins lcsh:Plant culture 01 natural sciences Heat stress chemistry.chemical_compound 0404 agricultural biotechnology Amylose lcsh:SB1-1110 Oryza sativa Oryza spp starch food and beverages Ripening 04 agricultural and veterinary sciences 040401 food science ripening radiation Horticulture chemistry Plant protein Amylopectin Composition (visual arts) Shading Agronomy and Crop Science 010606 plant biology & botany |
| Zdroj: | Plant Production Science, Vol 21, Iss 4, Pp 370-379 (2018) |
| ISSN: | 1349-1008 1343-943X |
| DOI: | 10.1080/1343943x.2018.1520047 |
| Popis: | Temperatures and solar radiation during ripening critically affect grain appearance in rice (Oryza sativa L.). Climatic factors to induce chalky grains were analyzed under the experimental conditions of high-temperature and shading treatment and also under the ambient condition in a high-temperature-prone region of Japan. The frequency of white-back (WB) and basal-white (BW) grains correlated with temperature and solar radiation, whereas that of milky-white (MW) grains was not correlated, suggesting that complicated climatic factors are involved in the formation of MW grains. Further investigation was carried out to identify the parameters that distinguish perfect and MW grains grown in high-temperature versus those grown in low-solar-radiation conditions. As reported previously, the chalk phenotypes in the transverse section of the MW grains were quite different between environments: oval-shaped chalk for MW grains grown in low-solar-radiation condition and center chalk for MW grains grown in high-temperature condition. Grain hardness and amylopectin chain-length distribution did not explain the difference in MW grains between environments. MW grains subjected to high temperatures had a lower protein content without a consistent reduction in the single-grain weight, whereas those from the low-solar-radiation condition had a lower amylose content with a consistent reduction in the single-grain weight, when compared with perfect grains that developed in either environmental condition. Overall, our results suggest that MW grains are formed through different physiological mechanisms with altered starch and protein synthesis under high-temperature and low-solar-radiation conditions. Abbreviations: BW: basal-white; DAH: days after heading; DP: degree of polymerization; MW; milky-white WB: white-back |
| Databáze: | OpenAIRE |
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