干旱胁迫对两种辣椒叶片气体交换和叶绿素荧光特性的影响

试验研究了干旱条件下鸡爪×吉林和正椒13号两种辣撤叶片气体交换和叶绿素荧光参数的变化.结果表明,干旱处理5 d导致叶片相对含水量(RWC)、相对电导率(REC)、净光合作用(Pn)和暗适应下PSII最大光化学效率(Fv/Fm)下降,其中对鸡爪×吉林影响大于正椒13号.干旱处理下两辣椒品种的气孔导度(Gs)下降,而水分利用效率(WUE)、非光化学猝灭系数(NPQ)和光呼吸速率/净光合速率(Pr/Pn)均明显增加,其中正椒13号上升幅度高于鸡爪×吉林,这可能是正椒13号比鸡爪×吉林更耐旱的原因.

Effects of drought stress on gas exchange and chlorophyll fluorescence characteristics in leaves of two pepper (Capsicum annuum L) varieties

Gas exchange and chlorophyll fluorescence characteristics of two varieties of pepper (Capsicum annuum L) were studied in drought stress. The results showed that relative water content(RWC), relative electrolyte conductivity(REC), net photosynthetic rate(Pn) and the maximal photochemical efficiency of PSII (Fv/Fm) were decreased by treated 5 d under drought stress, especially in Jizhao×Jilin. Drought resulted in a decrease of stomatal conductance (Gs), but induced significantly increases of water use efficiency (WUE), non-photochemical quenching coefficient (NPQ) and the ratio of photorespiration rate and net photosynthetic rate (Pr/Pn), especially in Zhengjiao No.13. These results suggested that higher drought tolerance of pepper was associated with the capacity to keep higher WUE, NPQ and Pr/Pn under drought stress.