盐胁迫下金银花叶片气体交换参数对光照和温度的响应  

Response of gas-exchange parameters in leaves of Lonicera japonica to changes in light and temperature under salt stress

作　　者：李树朋[1] 夏江宝[2] 王红燕[1] 吴仁烨[3] 夏青[1] 邓传远[1] 

机构地区：[1]福建农林大学园林学院,福建福州350002 [2]山东省黄河三角洲生态环境重点实验室,山东滨州256603 [3]福建农林大学作物科学学院,福建福州350002

出　　处：《福建农林大学学报（自然科学版）》2014年第2期132-138,共7页Journal of Fujian Agriculture and Forestry University:Natural Science Edition

基　　金：福建省教育厅资助项目(JB09295)

摘　　要：采用CIRAS-2型便携式光合作用仪测定不同盐浓度下2年生金银花叶片净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)和水分利用效率(WUE)等气体交换参数,研究盐胁迫下气体交换参数对光照和温度的响应规律,探讨有利于金银花正常生长的适宜盐浓度、光照和温度条件.结果表明:(1)盐浓度为0.3%时,金银花叶片的光补偿点最低,表观量子利用效率和光饱和点最高,光照有效利用区间为18.5-972.8μmol·m-2·s-1,表现出较宽的光照生态幅.(2)金银花叶片的气体交换参数对土壤盐度、光照和温度变化具有明显的阈值响应,其光合作用的适宜盐浓度为0-0.3%,最佳生长环境温度为25℃左右;盐浓度大于0.3%时,Pn、Tr、Gs和WUE下降,并随着盐浓度的增大下降越明显,耐盐碱能力表现出一定的局限性.(3)不同盐浓度下金银花叶片Pn、Gs和WUE对温度的响应均呈"先升高后下降"的变化趋势,而Tr对温度的响应呈上升的变化趋势.Using CID-portable photosynthesis system, the responses of gas-exchange parameters of two years old Loaicera japonica leaves to different fight and temperature conditions, including net photosynthetic rate （Pn）, transpiration rate （ Tr ）, stomata] con- ductance （C,s） and water use efficiency （WUE）, were measured under different salt concentrations. The regularity of gas-exchange parameters response to light and temperature under salt stress was clarified to explore the suitable concentration of salt, light and temperature conditions advantageous to the normal growth of L japonica. The results showed that： （ 1 ） Under 0.3 percent of salt concentration, the light compensation point of L japonica was the lowest, the use efficiency of apparent quantum and light saturation point were the highest, the light utilization range was 18.5 -972.8 μmol·m^-2·s^-1, which showed it had a wide ecological ampli- tude. （2） Gas-exchange parameters of L japonica leaves had critical response to the salinity of soil, the intensity of light and the change of temperature. The suitable salt concentration for leaf photosynthesis was in the range of 0 - 0.3 percent. The best growth temperature was 25 ℃. More than 0.3 percent of the salt concentration could decrease gas-exchange parameters, and with the in- crease of salt concentration decreased, the decline was more apparent. L japonica showed some limitations of salt tolerance. （ 3 ） The temperature change curves of Pn, C.s and WUE of L japonica under different salt concentrations were single peak curve （ first increased and then decrvased）, Tr was a rising curve.

关 键 词：金银花 盐胁迫 气体交换参数 光照 温度 

分 类 号：S567.79[农业科学—中草药栽培]