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### 乡土风箱果和紫叶风箱果叶片光合特性对土壤干旱的响应

1. 1黑龙江省科学院自然与生态研究所, 哈尔滨 150040
2东北农业大学资源与环境学院, 哈尔滨 150030
• 收稿日期:2016-11-02 发布日期:2017-06-18
• 通讯作者: *E-mail:xtwfwf@126.com
• 作者简介:许楠,男,1982年生,博士.主要从事植物生理生态学研究.E-mail:xunan0451@126.com
• 基金资助:
本文由国家自然科学基金项目(31500323)资助

### Responses of photosynthetic characteristics in leaves of Physocarpus amurensis and P opulifolius to drought stress

XU Nan1, MENG Xiang-xin-yue2, ZHAO Xi-ming2, AI Chang2, SUN Jia-qi2, ZHANG Si-yu2, ZHANG Cong-yang2, ZHANG Hui-hui2*

1. 1Natural Resources and Ecology Institute, Heilongjiang Sciences Academy, Harbin 150040, China
2College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China
• Received:2016-11-02 Published:2017-06-18
• Contact: *E-mail:xtwfwf@126.com
• Supported by:
This work was supported by the National Natural Science Foundation of China (31500323)

Abstract: This experiment was conducted to study the responses of photosynthetic gas exchange parameters and the chlorophyll fluorescence parameters in leaves to soil drought. Furthermore, the drought resistance abilities of the endangered native Physocarpus amurensis and the introduced P. opulifolius as well as their differences were studied. The results showed that the leaves of P. opulifolius wilted significantly, while the leaf water content and water use efficiency of the native P. amurensis were higher on the 7th day after soil drought. Soil drought reduced the net photosynthetic rate, stomatal conductance, and transpiration rate in the leaves of the two Physocarpus species, while the observed decrease of P. opulifolius was significantly higher than that of P. amurensis. On the 7th day after soil drought, the intercellular CO2 concentration (Ci) of P. opulifolius was higher than that without drought treatment, while the Ci of P. amurensis was lower than that without drought treatment. The electron transfer rate (ETR) and photochemical quenching coefficient (qP) in leaves of P. amurensis were clearly decreased, while differences of the light energy capture efficiency (Fv′/Fm′) in the PSⅡ reaction center were non-significant. However, Fv′/Fm′, ETR, and qP in the lea-ves of P. opulifolius were all significantly decreased to greater extents compared to those in P. amurensis. On the 7th day after soil drought, a non-significant change was observed on the relative variable fluorescence (VJ) at site J of the OJIP curve of P. amurensis leaves, while VJ in leaves of P. opuli-folius was increased. The carbon assimilation ability of P. opulifolius leaves and the sensibility of PSⅡ function to soil drought were significantly higher than those of P. amurensis. The reduction in the photosynthetic capacity induced by soil drought was mainly due to the limitation of the stomatal factors for P. amurensis, but mainly due to the limitation of the non-stomatal factors for P. opulifolius.