盐分胁迫下金银花胞间CO_2浓度对光照和温度的响应特性

The response of honeysuckle intercellular CO_2 concentration to light and temperature under salt stress

利用CIRAS-2型便携式光合作用仪测定了盐分胁迫下2年生金银花叶片胞间CO2浓度(Ci)对光照和温度的响应过程,阐明了其Ci对土壤盐分、光照强度和温度的响应规律。结果表明:(1)金银花Ci随光照强度的增强而降低,两者负相关性显著,主要由叶肉细胞的光合活性增大所引起;(2)金银花Ci随温度增大呈向上的单峰响应曲线,在20-30℃时,各盐分浓度下金银花Ci值的升高是由气孔导度、叶肉导度增大所引起;(3)土壤盐分浓度对金银花叶片气孔导度、叶肉导度产生抑制作用,引起叶片Ci下降,并随盐分浓度增大其抑制作用愈强。综上表明,金银花的光合生理参数受外界土壤环境盐度的影响较小。

Using CIRAS-2 type portable instrument of photosynthesis to determine the response of intercellular CO2 concentration （Ci） to fight and temperature in 2 years Lonicera japonica blades under salt stress, it illustrated the response mechanism of Ci to soll salinity, light intensity and temperature. The results showed as follows. （ 1 ） The Ci reduced as PAR enhancement with a significant negative correlation, caused by the increase of mesophyll cells photosynthetic activity. （2） With temperature increasing, the Ci showed upward unimedal response curve. Under different salt concentrations, Ci value increased, caused by the increase of the stomatal conductance and mesophyll conductance at 20 - 30 ℃. （ 3 ） The soil salinity concentration inhibited honeysuckle blade stomatal conductance and mesophyll conductance, thus caused the blade Ci descend. Meanwhile the inhibition became stronger with the increase of salt concentration. It was proved that the effect of soft salinity on photosynthetic physiological parameters of honey-suckle was insignificant.