不同光照对蝴蝶花光合特性及生长发育研究

A study on photosynthetic characteristics and growth and development of Iris japonica under different illumination

用Li-6400光合测定系统测定了不同光照下蝴蝶花的光合特性,结合蝴蝶花的生长发育状况,探讨了蝴蝶花在不同光照下的适应性。结果显示,随植株上层光强的降低,蝴蝶花的Chl a/Chl b、净光合速率、气孔导度、蒸腾速率、胞间CO2浓度均呈降低趋势,Chl b含量、蒸汽压亏缺、气孔限制呈增加趋势;光补偿点、暗呼吸速率、CO2补偿点、表观量子效率下降,羧化效率增加,揭示了蝴蝶花对光照减低的生理适应机制;蝴蝶花的光补偿点在5.18～12.05μmol/m2.s,光饱和点在1 000μmol/m2.s左右,说明其对光的适应范围较宽。CO2补偿点在54.84～58.45μmol/mol、CO2饱和点在970μmol/mol左右。结合蝴蝶花生长发育状况分析,竹林下植株的叶面积最大、开花状况最佳,生长最好。但3种环境下植株均能生长。

Adaptability of Iris japonica under different illuminations was studied with the photosynthetic characteristics measured with a Li-6400 photosynthesis system.The Chl a/Chl b,net photosynthetic rate,stomatal conductance,transpiration rate and intercellular CO2 concentration decreased with less light on the plants,and the light compensation point,dark respiration rate,the CO2 compensation point also decreased,but the carboxylation efficiency increased as a mechanism of physiological adaptability to light decreasing.The adaptability to light was wide because the light compensation point was 5.18-12.05 μmol/（m2·s） and the light saturation point was higher（about 1 000 μmol/m2·s）;the CO2 compensation point was 54.84-58.45 μmol/mol and the CO2 saturation point was about 970 μmol/mol;the plants under bamboo forest had bigger leaf area and better flowering than that of other community patterns,but the plants could grow under the three community patterns.