Effects of drought stress at different growth stages and rehydration on the photosynthetic characteristics and yield of peanuts

摘要

In this study, under the conditions of cement pool culture and through artificial water control, the effects of drought stress at various growth stages and rehydration on the photosynthetic characteristics and yield of peanuts were investigated. The study results showed that at the different growth stages, after drought stress, peanut leaf area index (LAI), leaf chlorophyll content, net photosynthetic rate and chlorophyll fluorescence parameters such as Fv/Fo, Fv/Fm and OPS II were reduced by varyingdegrees, and these reductions increased with the increase of drought degree. Among these stages, the drought degree was shown to decrease minimally at the pod-filling stage, moderately at the seedling stage, and maximally at the pod-pegging and pod-setting stages. As may be seen from the respective recovery degrees after rehydration at the different growth stages, the recovery level was highest at the seedling stage, moderate at the pod-pegging stage, and lowest at the pod-setting stage. The effect ofdrought on the pod yield was minimal at the seedling stage, moderate at the pod-filling stage, and maximal at the pod-pegging and pod-setting stages. The authors believe that the soil water shortage is sensitive at the pod-pegging and pod-setting stages,during which if drought occurs then irrigation must be performed.