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  • Title: [Responses of photosynthetic characteristics in leaves of Physocarpus amurensis and P opulifolius to drought stress].
    Author: Xu N, Meng XX, Zhao XM, Ai C, Sun JQ, Zhang SY, Zhang CY, Zhang HH.
    Journal: Ying Yong Sheng Tai Xue Bao; 2017 Jun 18; 28(6):1955-1961. PubMed ID: 29745159.
    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 PS2 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 PS2 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. 研究叶片光合气体交换参数和叶绿素荧光参数对土壤干旱的响应,分析濒危的乡土风箱果和引种紫叶风箱果的抗旱能力及其差异.结果表明: 土壤干旱第7天时,紫叶风箱果叶片明显失水萎蔫,而乡土风箱果却有较高的叶片含水率和水分利用效率.土壤干旱降低了2种风箱果叶片的净光合速率、气孔导度和蒸腾速率,紫叶风箱果降低幅度明显大于乡土风箱果.土壤干旱7 d时,紫叶风箱果叶片的胞间CO2浓度(Ci)高于未干旱处理,而乡土风箱果Ci低于未干旱处理.乡土风箱果叶片的电子传递速率(ETR)和光化学淬灭系数(qP)明显降低,而PSⅡ反应中心光能捕获效率(Fv′/Fm′)没有发生明显变化;但是紫叶风箱果叶片的Fv′/Fm′、ETR和qP均明显降低,并且其降低幅度大于乡土风箱果.土壤干旱7 d时,乡土风箱果叶片OJIP曲线上J点的相对可变荧光(VJ)没有发生明显变化,而紫叶风箱果叶片VJ明显增加.紫叶风箱果的叶片碳同化能力和PSⅡ功能对土壤干旱的敏感性明显大于乡土风箱果,土壤干旱降低乡土风箱果光合能力的原因以气孔因素限制为主,而紫叶风箱果以非气孔因素限制为主.
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