Fundamental Research on the Application of Rice Seed-coating-agent with the Composition of ABA and SA

In lab experiment,the rice seed-coating-agent with the composition of 1.2 mg/kg ABA and 6 mg/kg SA was used to test the physiological and biochemical indexes of seed germination,seedling growth and seedling under low temperature treatment,with rinsing as the control.Determination showed that compared with the control,the tested rice seeds treated by ABA and SA coating-agent had the propertys of high seed germination percentage,high seed haleness,strong rooting ability and high ability of photosynthesis by chloroplast of unit chlorophyll content.Under low temperature stress,the rice seedling treated by ABA and SA coating-agent decreased the chlorophyll content(14%),with the decreasing degree being lower than CK(24%) and the hurting degree of root being smaller than CK;the proportion of thermal instability protein in seedling in total protein increased by 8.25% than normal temperature CK,with the increasing degree being higher than CK(6.39%);the ability of getting rid of active oxygen in treated seedlings was stronger than CK,indicating that the ability of low temperature resistance in treated seedlings being higher than CK.Determination of MDA and electrolyte permeability in rice seedling leaves also showed that the treated seedling enhanced the ability of low temperature resistance.