Effect of Dark Respiration on Dry Matter Production of Field-Grown Rice Cultivars : Growth efficiency of early, medium, and late-maturing cultivars

Japanese Journal of Crop Science

Toshiro KURODA¹  Takasi OHNAKA¹  Kuniyuki SAITOH¹ 

关键词: Dark respiration rate;    暗呼吸速度;    Dry matter production;    乾物生産;    Earliness of cultivar;    水稲;    Growth efficiency;    生長効率;    Rice;    早晩性;   

DOI  :  10.1626/jcs.69.385

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The dry matter production, dark respiration rate, and growth efficiency of early-(Koshihikari), medium-(Nipponbare)and late-(Akebono)maturing rice cultivars, were examined. The yield was lowest in Koshihikari than the other two cultivars because of poor ripening. The phytomass yield was in the order of Akebono > Nipponbare > Koshihikari because of the larger leaf area and the longer growth duration in later cultivars. The crop growth rate was higher in Koshihikari during the early growth stage in spite of its lower leaf area. The dark respiration rate (Rs) in the whole plant was highest at the rooting stage and rapidly decreased until the heading time;it decreased gradually thereafter. Rs in the panicle was highest at 7-14 days after the heading time and decreased to nearly zero by the maturing stage. In Koshihikari, however, it was maintained above zero at maturity. The respiratory loss as land areal basis was highest at about the heading time in all cultivars and decreased thereafter. The later the maturing time of the cultivar, the longer the period with high respiratory loss. The growth efficiency (net production/gross production) was above 60% at the rooting stage, but it was lowered during the grain-filling period, especially in Koshihikari and in Akebono. These were attributable to the higher atmospheric temperature in Koshihikari and larger plant body in Akebono, both requiring more respiration to be maintained. The growth efficiency in the panicle was higher in the order of Akebono>Nipponbare>Koshihikari, implying that the higher temperature during the grain-filling period increased the respiratory loss independent of the growth of grains.

【 授权许可】

Unknown