The Study On Heat Resistance Mechanism And Select Standard In Seedling Of Eggplant

A study on the effects of heat stresses in eggplant was conducted in a growth chamber and the field condition. The changes of some physiological and biochemical items in the leaves of cultivars of eggplant (heat-tolerant HaiNanZhenTouQie, less heat-tolerant F-85Qie and heat-sensitive ShengQingZiChangQie) after heat stress was studied for the search of physiological foundation and the select standard in seeding of eggplant.The result showed:1.Under high temperature, growth was inhibited severely, root activity and Chlorophyll content were decreased, respiration was enhanced. In thermo-resistant cultivar (HaiNanZhenTouQie) these changes were not obvious and a strong recoverable ability was found.2.After heat stress, the accumulation of 02 and H202 was induced, the membrane structure was damaged, the activities of Catalase(CAT) and Peroxidase(POD) increased obviously, Superoxide dismutase(SOD) increased in thermo-resistant cultivar and decreased in others, Ascorbic acid(ASA) content decreased and Reduced glatathione(CSH) increased in every one. The protection of enzyme and non-enzyme active oxygen scavenging system is more effective in the thermo-resistant cultivar than in others.3.In therrno-resistant cultivar, the degradation of proteins and the accumulation of free amino acid were low after heat stress and a strong water retaining capacity was found.4.The membrane damage extent under high temperature, proline content, thevariational quantity of transpiration and root activity were suggested as select standard for the thermo-breeding. These criterions should be taken intoaccount as a whole.