中国无忧花对光强和CO_(2)浓度的光合响应  

Photosynthetic Response to Light and CO_(2) of Saraca dives

作　　者：徐桂红[1] 杨蕾蕾 陈朋[1] 李凌飞 秦密 XU Gui-hong;YANG Lei-lei;CHEN Peng;LI Ling-fei;QIN Mi(Shenzhen Fairy Lake Botanical Garden,Shenzhen 518004,Guangdong China)

机构地区：[1]深圳市仙湖植物园,广东深圳518004

出　　处：《亚热带植物科学》2022年第5期340-344,共5页Subtropical Plant Science

基　　金：深圳市城管局科研项目(202204)。

摘　　要：通过盆栽试验研究中国无忧花(Saraca dives)叶片光合作用对光强和CO_(2)的响应。结果表明,在一定光强范围内,中国无忧花的净光合速率、气孔导度、蒸腾速率随着光强增加而增加,但在强光照下又表现出光抑制现象。中国无忧花光饱和点为541.23μmol·m^(–2)·s^(–1),光补偿点为10.20μmol·m^(–2)·s^(–1),暗呼吸速率为1.01μmol·m^(–2)·s^(–1),表观量子效率为0.0247 mol·mol^(–1)。中国无忧花为阳生植物,对土壤水分需求较高。在饱和光强下,中国无忧花净光合速率、水分利用效率和胞间CO_(2)浓度随着CO_(2)浓度的增加呈升高趋势。中国无忧花CO_(2)饱和点为1608.04μmol·mol^(–1),CO_(2)补偿点为82.25μmol·mol^(–1),光呼吸速率为0.94μmol·m^(–2)·s^(–1),表观羧化效率为0.0247 mol·mol^(–1)。中国无忧花在饱和光强时具有较宽的CO_(2)利用范围。The light and CO_(2) response curves in leaves of Saraca dives were studied through potted control experiments.The results showed that the net photosynthetic rate,stomatal conductance,and transpiration rate of S.dives increased with the increase of light intensity at a certain light intensity,and showed photoinhibition under strong light.The light saturation point of S.dives was 541.23μmol·m^(–2)·s^(–1);the light compensation point was 10.20μmol·m^(–2)·s^(–1);the dark respiration rate was 1.01μmol·m^(–2)·s^(–1);the apparent quantum efficiency was 0.0247 mol·mol^(–1).Under the saturated light intensity,the net photosynthetic rate,water use efficiency and intercellular CO_(2) concentration of S.dives increased with the increase of CO_(2) concentration.The CO_(2) saturation point of S.dives was 1608.04μmol·mol^(–1),the CO_(2) compensation point was 82.25μmol·mol^(–1),the photorespiration rate was 0.94μmol·m^(–2)·s^(–1),and the apparent carboxylation efficiency was 0.0247 mol·mol^(–1).It provided a reference for the cultivation,popularization and application of S.dives.

关 键 词：中国无忧花 光合作用 光响应曲线 CO_(2)响应曲线 

分 类 号：Q945.11[生物学—植物学]