竹柳无性系光合特性的研究

Research of photosynthetic characteristics of Salix 'Zhuliu' clone

以竹柳3个无性系为研究对象,以‘垂暴109’柳为对照,研究光合作用光、CO2响应过程和净光合速率日变化。结果表明:竹柳3个无性系最大光合速率都明显大于对照,对照暗呼吸速率则明显大于竹柳3个无性系;当光照强度逐渐增强时,竹柳光合效率高于对照;竹柳与对照净光合速率随着CO2浓度上升而缓慢上升,达到最大值之后净光合速率随着CO2浓度增加而快速下降,达到最大值时大小顺序为:竹柳无性系2>竹柳无性系1>竹柳无性系3>对照;竹柳光饱和点都明显高于对照,对照光补偿点则明显高于竹柳;竹柳羧化效率明显高于对照,对照CO2补偿点则高于竹柳;竹柳无性系1、竹柳无性系2和对照的净光合速率呈现双峰模式,竹柳无性系3则呈现三峰模式;竹柳净光合速率趋饱和时间为6 h,对照为5 h。

The light, CO2 response process of photosynthetic and net photosynthetic rate diurnal variation were researched by choosing the three Salix ‘Zhuliu ’ clone as research object and the Salix x‘Chuibao109 ’ as control.The results showed that the maximum photosynthetic rate of three Salix‘Zhuliu’ clone was higher than the control significantly.Never-theless, the dark respiration rate of control was significantly greater than three Salix‘Zhuliu’ clone.The photosynthetic ef-ficiency of Salix‘Zhuliu’ was higher than the control when the light intensity increased gradually.The net photosynthetic rate of Salix‘Zhuliu’ and control increased with the rise of CO2 concentration.The net photosynthetic rate decreased rap-idly with the increase of CO2 concentration after reaching the maximum.The maximum size order was Salix‘Zhuliu’ clone 2〉Salix‘Zhuliu’ clone 1 〉Salix‘Zhuliu’ clone 3〉control.The light saturation point of Salix‘Zhuliu’ were signifi-cantly higher than the control.The light compensation point of control was significantly higher than Salix ‘Zhuliu’ .The carboxylation efficiency of Salix‘Zhuliu’ was significantly higher than control.The CO2 compensation point of control was higher than Salix‘Zhuliu’ .The the net photosynthetic rate of Salix‘Zhuliu’ clone 1, Salix‘Zhuliu’ clone 2 and control presented bimodal pattern while Salix‘Zhuliu’ clone 3 presented triplet pattern.The net photosynthetic rate saturated time of Salix ‘Zhuliu’ was 6 h and the control was 5 h.