摘要
为探究煤污病对薄壳山核桃光合特性的影响,以Stuart、Wichita、Pawnee 3种受煤污病危害程度不同的品种为对象,测定染病叶片及健康叶片的光合参数、光响应曲线以及叶绿素荧光参数。结果表明:煤污病可显著影响薄壳山核桃叶片的光合气体交换,3个品种染病叶片光合气体交换参数[净光合速率(Pn)、蒸腾速率(Tr)、胞间CO2浓度(Ci)及气孔导度(Gs)]较健康叶片均出现显著下降(P<0.05),其程度从大到小依次为Stuart>Wichita>Pawnee。就Pn而言,Stuart染病叶片下降61.07%,Wichita染病叶片下降51.26%,Pawnee染病叶片下降40.62%。光响应曲线显示,3个品种染病叶片的最大净光合速率(Pnmax)均显著低于健康叶片,暗呼吸速率(Rd)与健康叶片无显著差异,表观量子效率(AQY)均显著低于健康叶片,光补偿点(LCP)均显著高于健康叶片。3个品种染病叶片的叶绿素荧光参数(Fv/Fm、ΦPSⅡ、ETR、qP)相比于健康叶片,整体而言均出现了下降,但未达到显著水平。说明煤污病可造成薄壳山核桃叶片光合速率下降,净光合速率下降程度为40.62%~61.07%。染病叶片利用弱光的能力下降,合成的光合产物减少,而实际光合效率并未显著降低,光合机构仍较为稳定。
To explore the effects of sooty mold on photosynthetic characteristics of pecan,photosynthetic parameters,light response curves and chlorophyll fluorescence parameters of infected and healthy leaves of Stuart,Wichita and Pawnee were measured.The results showed that sooty mold could significantly affect the photosynthetic gas exchange of pecan leaves,and the gas exchange parameters[net photosynthetic rate(Pn),transpiration rate(Tr),intercellular CO2 concentration(Ci),stomatal conductance(Gs)]of infected leaves of three cultivars were significantly decreased compared with those of healthy leaves(P<0.05),with the order of Stuart>Wichita>Pawnee.The Pn of infected leaves of Stuart,Wichita,Pawnee decreased by 61.07%,51.26%and 40.62%,respectively.The results of light response curves showed that maximum net photosynthetic rate(Pnmax)of infected leaves was significantly lower than that of healthy leaves,dark respiration rate(Rd)of infected leave had no significant difference with that of healthy leaves,apparent quantum efficiency(AQY)of infected leaves was significantly lower than that of healthy leaves,and light compensation point(LCP)of infected leaves was significantly higher than that of healthy leaves.Compared with those of healthy leaves,the chlorophyll fluorescence parameters(Fv/Fm,ΦPSⅡ,ETR,qP)of infected leaves of the three cultivars decreased,but the difference was not significant.In conclusion,sooty mold can reduce the photosynthetic rate of pecan leaves,and the Pn decreases by 40.62%-61.07%.The ability of weak light utilization and the photosynthetic production of infected leaves are decreased.The actual photosynthetic efficiency of infected leaves is not significantly reduced,and the photosynthetic mechanism is still relatively stable.
作者
陈雅琦
莫正海
娄文睿
翟敏
郭忠仁
宣继萍
CHEN Ya-qi;MO Zheng-hai;LOU Wen-rui;ZHAI Min;GUO Zhong-ren;XUAN Ji-ping(Institute of Botany,Jiangsu Province and Chinese Academy of Sciences,Nanjing 210014,China;Jiangsu Key Laboratory for the Research and Utilization of Plant Resources,Nanjing 210014,China;The Jiangsu Provincial Platform for Conservation and Utilization of Agricultural Germplasm,Nanjing 210014,China)
出处
《江苏农业学报》
CSCD
北大核心
2021年第4期968-973,共6页
Jiangsu Journal of Agricultural Sciences
基金
江苏省林业局林业科技创新项目[LYKJ(2020)04]。
关键词
薄壳山核桃
煤污病
光响应曲线
叶绿素荧光参数
pecan
sooty mold
light response curve
chlorophyll fluorescence parameters
