摘要
The photosynthetic characters were investigated among soybean cultivars with high photosynthetic efficiency and high yield. The results indicated that: 1) There were significant differences in photosynthetic rate (Pn) and dark respiration rate (DR) under saturation light intensity and appropriate temperature. 2) There were a little difference in light compensation point among them. Photo flux density (PFD) were about 360μmol/m2·s when Pn tended to zero. 3) When PFD>1 900 μmol/m2·s, photoinhibition occuried a-mong the cultivars. Diurnal variation of Pn was shown a curve with two peaks. 4) The cultivars with high photosynthetic efficiency were subjected less to photoinhibition than that with high yield. Critical temperatures of photoinhibition in high photosynthetic efficiency cultivars were higher than that of high yield.
The photosynthetic characters were investigated among soybean cultivars with high photosynthetic efficiency and high yield. The results indicated that: 1) There were significant differences in photosynthetic rate (Pn) and dark respiration rate (DR) under saturation light intensity and appropriate temperature. 2) There were a little difference in light compensation point among them. Photo flux density (PFD) were about 360μmol/m2·s when Pn tended to zero. 3) When PFD>1 900 μmol/m2·s, photoinhibition occuried a-mong the cultivars. Diurnal variation of Pn was shown a curve with two peaks. 4) The cultivars with high photosynthetic efficiency were subjected less to photoinhibition than that with high yield. Critical temperatures of photoinhibition in high photosynthetic efficiency cultivars were higher than that of high yield.
作者
MAN Wei-qun, DU Wei-guang, ZHANG Gui-ru, LUAN Xiao-yan GE Qiao-ying, HAO Nai-bin and CHEN Yi( Soybean Institute , Heilongjiang Academy of Agricultural Sciences , Harbin 150086 , P. R . China
Institute of Botany, Chinese Academy of Sciences , Beijing 100093 , P. R . China )
基金
funded by the State Key Basic Research and Development Plan(G1998010100).
