Leaf Temperature and Physiological Traits of Panicle under Different Soil Water Potential

Japonica 1 was used to study leaf temperature and leaf physiological indicators under different time and rehydration of different water stress in different soil water gradient.The results showed that with lowering of soil water potential,the leaf temperature increased under different soil moisture stress during the daytime,but leaf temaperature was lower than air temperature.Leaf temperatures of all treatments were the same after 7 days' rehydration and still lower than air temperature.The chlorophyll content decreased during controlling the water,but it increased after 7 days' rehydration with mild water stress treatment(-0.02～-0.05MPa) higher than controlling water for 14 days,and severe water stress treatment(-0.06～-0.08MPa) higher than controlling water for 7 days.This showed a kind of compensation phenomenon.Leaf temperature was very significantly negatively correlated with chlorophyll a's content at 15∶00 pm.Under mild water stress,malondialdehyde(MDA) content decreased,but increased after rehydration and kept at the same level at the beginning of controlling water.Under severe water stress,malondialdehyde content increased,but decreased after rehydration and still higher than the level at the beginning of controlling water.Malondialdehyde content showed highly significant positive correlation with leaf temperature at 13∶00 pm and significant positive correlation at 14∶00 pm.