Studies on Dry Matter Production of Napiergrass : VII. Night respiratory rate in shoot as affected by the growth of plant

Japanese Journal of Crop Science

Yasuyuki ISHII¹  Koji ITO¹  Shinobu INANAGA¹  Takashi MORIMUNE¹ 

关键词: Growth retardant;    維持呼吸率;    Internode elongation;    呼吸速度の温度係数;    Maintenance respiratory activity;    節間伸長;    Napiergrass;    地上部の夜間呼吸速度;    Night respiratory rate in shoot;    ネピアグラス;    Temperature coefficient of respiratory rate;    矮化剤;   

DOI  :  10.1626/jcs.61.401

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The relation of internode elongation of stem to night respiration in shoot of napiergrass (Pennisetum purpureum Schumach, cv. Merkeron) was investigated. The changes of the night respiratory rates with the normal growth of plant accompanying the internode elongation were measured (Expt. 1) and were also compared with the changes in the dwarfed plants, of which internode elongation was severely suppressed by spraying a 0.538% (L L-1) solution of paclobutrazole (Expt. 2, 3). The temperature coefficient, QSUP10 of respiratory rate was estimated to be 1.94 for both of control and dwarfed plants. The respiratory activities of leaf blade and stem with leaf sheath decreased with the growth of plant and the latter decreased more significantly than the former (Expt. 1, 3). This reduction in stem was slower in dwarfed plants than in normal, while the respiratory activity of leaf blade was not affected by the growth retardant (Expt. 3). The maintenance respiratory activities (M) were estimated by statistical analyses using the data on respiration, assimilation and dry weight of shoot (Expt. 1, 2). Values of M for the normal plants appeared to be comparatively low among those hitherto obtained for other crops, and the values for dwarfed plants were higher than those for control plants. It was inferred that the elongation and subsequent senescence of internodes in the normally growing napiergrass contributed to lessen the loss of photosynthate through respiration.

【 授权许可】

Unknown