Effects of Soil Moisture on Chlorophyll Content,Photosynthetic Characteristics and Activity of Protective Enzyme in Pepper Leaves
The current trial studied leaf chlorophyll content, photosynthetic characteristics, protective enzyme activity, free proline and MDA content under different soil moisture status for pepper plants to explore the relationship between these physiological indicators and drought resistance, applying four levels of water available. Horns pepper was researched by the four soil moisture levels (field capacity 40%~55% -A1,55%~70% -A2,70%~ 85%-A3,85%~100%- A4) to measure the change rule of leaf chlorophyll content, photosynthetic characteristics, protective enzyme activity, free proline and MDA content. The results indicated that;①with the reduction of soil moisture, SPAD readings, Pn, Gs, Ci and Tr depressed accordingly showing a clear positive correlation, however, free proline and MDA content were on the rise; ②The activity of SOD, CAT and POD increased to a certain extent at moderate moisture stress status, however, decreased under extreme moisture stress status, and CAT and POD activity were almost presented opposite trends by comparison with the change of soil moisture;③The WUE was highest in 55%~70% of field capacity. Take into consideration of the effects of soil moisture on chlorophyll content, photosynthetic characteristics, activity of protective enzyme and water utility efficiency of pepper leaves comprehensively; the field capacity 55%~70% could be used as an ideal soil moisture index of fruiting stage.
国家科技期刊平台
NSTL
万方数据
维普
