不同生育期水分亏缺对青椒气孔特征、生长过程及生物量的影响

Effects of Deficit Regulation at Different Growth Stages on Stomatal Characteristics,Growth Process and Biomass of Green Peppers

为探究青椒在不同生育期对水分亏缺的生理响应机制,以‘中椒107’为试材,采用不同程度的亏水处理(充分灌溉FI、苗期轻度调亏SSMD、苗期重度调亏SSSD、花期轻度调亏FSMD、花期重度调亏FSSD),研究了水分亏缺对青椒各个生育时期气孔特征、生长过程和生物量的影响。结果表明:①苗期调亏增加青椒的气孔密度和气孔宽度;②充分灌溉条件下茎粗和株高生长趋势明显高于水分亏缺处理,而花期调亏处理的叶面积指数最大;③苗期重度调亏青椒地上、地下生物量最大,苗期调亏植物组织含水率最高。苗期重度调亏最有利于青椒的生长发育和生物量累积。

In order to explore the physiological response mechanism of green pepper in different growth stages to water stress,in this study,the green pepper(Capsicum annuum var.Zhongjiao 107)was selected as test material,the effects of water deficit on stomatal characteristics,growth process and biomass of green pepper were studied by using different levels of water deficit treatment(full irrigation,FI;mild regulated deficit at seedling stage,SSMD;severe regulated deficit at seedling stage,SSSD;mild regulated deficit at flowering stage,FSMD;severe regulated deficit at flowering stage,FSSD).The results showed as follows:①The stomatal density and stomatal width of green pepper were increased by regulating deficit at seedling stage;②The growth trend of stem diameter and plant height under full irrigation was significantly higher than that under water deficit treatment,and leaf area index(LAI)under regulated deficit treatment at flowering stage was the highest.③The aboveground and underground biomass of severely regulated deficit green pepper at the seedling stage was the highest,and the water content of the regulated deficit plant tissue was the highest at the seedling stage.It can be concluded that severe water deficit at seedling stage is the most beneficial treatment to the growth and biomass accumulation of green pepper.