Effect of High Temperature on Ripening in Rice Plants : Comparison of the effects of high night temperatures and high day temperatures(Crop Physiology and Cell Biology)

Japanese Journal of Crop Science

Hiroyuki SHIRATSUCHI¹  Satoshi MORITA¹  Konosuke FUJITA¹  Jun-ichi TAKANASHI¹ 

关键词: Grain dimension;    玄米品質;    Grain quality;    高昼温;    Grain weight;    高夜温;    Growth cabinet;    人工気象室;    High day temperature;    水稲;    High night temperature;    登熟;    Rice;    粒径;    Ripening;    粒重;   

DOI  :  10.1626/jcs.71.102

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The effects of high-temperature stress on rice ripening is well documented. However, it is unclear which is more effective on rice ripening, high night temperature (HNT) or high day temperature (HDT) . In this study, the effects of HNT (22/34°C; day/night temperature) has been compared with those of HDT (34/22°C), with a control (22°C continuously or 28/20°C; max/min temperature) under growth cabinets. The average grain weight decreased under HNT compared with that of control, but it was not affected under HDT. On the other hand, the percentage of normal (undamaged) grains decreased not only under HNT, but also under HDT. Furthermore, the decreases in grain weight and grain quality took place in spite of the grain position in a panicle. The indicator of grain volume (length×width×thickness) correlated with the grain weight. Under HNT, grain width and thickness both decreased; under HDT, grain width decreased, but thickness increased. These results suggest that the decrease in grain width and its thickness affected the grain weight decreases under HNT, whereas under HDT the grain weight remains stable because the loss of width would be fully compensated for by increases in its thickness.

【 授权许可】

Unknown