Physiological Responses to Drought Stress in Seedlings of Rice Cultivar Dongjin

Abstract

Abstract: In order to find out the physiological responses of rice plants to drought stress, several aspects, including plant water status, oxidative stress, osmoprotectant metabolism and integrity of cell membrane, were analyzed of the seedlings of cultivar Dongjin (Oryza sativa L. subsp. japonica) under drought conditions. The results showed that both the net photosynthesis rate and the relative water content decreased significantly within 5 days of drought treatment and declined rapidly thereafter. The rapid increase of the content of malondialdehyde and the electrolyte leakage rate happened after 5-day drought treatment and both responses had a similar trend. The proline content increased dramatically after treatment for 6 days. The level of reactive oxygen species first dropped slightly at day 6 of treatment, then increased gradually, and elevataed to a significant level at 8th day. The net photosynthesis rate and the relative water content are among the quick responses to drought stress, and combined with the electrolyte leakage rate and the contents of ROS, malondialdehyde and praline. These physiological responses can be used in comprehensive evaluation of rice seedlings for drought tolerance.

CLC Number:

S-511

Zhang Jingyuan, Fan Yunliu, Zhao Jun. Physiological Responses to Drought Stress in Seedlings of Rice Cultivar Dongjin[J]. Chinese Agricultural Science Bulletin, 2007, 23(2): 231-231.

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