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Effect of high temperature stress during ripening on the accumulation of key storage compounds among Japanese highly palatable rice cultivars
Journal of Cereal Science ( IF 3.8 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.jcs.2020.103018
Tsutomu Ishimaru , Masayuki Miyazaki , Takanari Shigemitsu , Masaru Nakata , Masaharu Kuroda , Motohiko Kondo , Takehiro Masumura

Abstract High temperature stress during ripening increases the frequency of chalky grains, resulting in a lower market value for rice (Oryza sativa L.). Changes in starch properties and the accumulation pattern of storage proteins are proposed to be related to the occurrence of chalky grains. This study investigated changes in the accumulation of key storage compounds in the grains of Japanese highly palatable rice cultivars, subjected to high temperature stress when grown in a growth chamber and the field. The 13 kDa prolamin content was significantly reduced in a highly heat-sensitive cultivar, Tsukushiroman, whereas the 13 kDa prolamin content was not affected in a heat-tolerant cultivar, Genkitsukushi, even in a high temperature chamber condition (31/26 °C day/night), when compared with the control chamber condition (26/21 °C day/night) for both genotypes. In addition, grains grown in field conditions revealed that severely chalky grains had less 13 kDa prolamin than perfect grains in all five genotypes. Changes in amylose content and the distribution of amylopectin chain lengths did not explain the difference in grain appearance both for chamber and field experiments. These results strongly suggest that physiological processes linked with the synthesis of 13 kDa prolamin are associated with grain appearance in Japanese highly palatable under high temperature stress.

中文翻译:

成熟期高温胁迫对日本适口性水稻品种关键贮藏化合物积累的影响

摘要 成熟期间的高温胁迫增加了白垩粒的出现频率,导致水稻 (Oryza sativa L.) 的市场价值降低。淀粉性质的变化和储存蛋白的积累模式被认为与白垩粒的发生有关。本研究调查了在生长室和田间生长时受到高温胁迫的日本高适口水稻品种的谷物中关键储存化合物的积累变化。13 kDa 醇溶蛋白含量在高度热敏品种 Tsukushiroman 中显着降低,而 13 kDa 醇溶蛋白含量在耐热品种 Genkitsukushi 中不受影响,即使在高温室条件下(31/26 °C 天) /夜晚),与两种基因型的控制室条件(26/21 °C 白天/黑夜)相比。此外,在田间条件下生长的谷物表明,在所有五种基因型中,严重白垩的谷物比完美谷物的醇溶蛋白少 13 kDa。直链淀粉含量和支链淀粉链长分布的变化并不能解释室内试验和田间试验中谷物外观的差异。这些结果有力地表明,与 13 kDa 醇溶蛋白合成相关的生理过程与在高温胁迫下高度适口的日本谷物外观有关。直链淀粉含量和支链淀粉链长度分布的变化并不能解释室内试验和田间试验中谷物外观的差异。这些结果有力地表明,与 13 kDa 醇溶蛋白合成相关的生理过程与在高温胁迫下高度适口的日本谷物外观有关。直链淀粉含量和支链淀粉链长度分布的变化并不能解释室内试验和田间试验中谷物外观的差异。这些结果有力地表明,与 13 kDa 醇溶蛋白合成相关的生理过程与在高温胁迫下高度适口的日本谷物外观有关。
更新日期:2020-09-01
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