Abstract:

The changes of the physiological and biochemical indices in different growth period under drought stress were researched in this paper to explore the drought-resistant physiological mechanisms of potato. The super oxide dismutase (SOD), malon dialdehyde (MDA) and Pro of the potato variety ‘Jizhangshu8’ and ‘Shepody’, which were extensively planted in production and planted inside different shed-houses under the condition of drought stress, were measured. The results showed that the content of malon dialdehyde (MDA) and Pro increased, but SOD activity declined under drought stress. The effect of drought stress in flower stage to the physiological and biochemical indices was the largest. The increase rate of MDA was smaller, SOD activity also higher in stronger drought-resistant varieties, while the weak drought-resistant varieties were contrary. The strong drought resistance varieties have regulatory mechanism in physiological and biochemical indices.