Effects of drought stress on endogenous hormones contents in tissue culture seedling and seed seedling of Camellia oleifera

In order to learn mechanism of drought stress in Camellia oleifera,effects of drought stress on endogenous hormones contents in tissue culture seedling and seed seedling of C.oleifera were studied.The results show that under drought stress,the ABA content is increased,the ZR and GA3 contents are decreased,while the IAA content is firstly increased and then decreased.Meanwhile,the variation trends of endogenous hormones in tissue culture and seed seedlings under drought stress are accordance,and the variation amplitudes have no significant differences.According to variation of the ABA content,it is deduced that drought resistances between tissue culture and seed seedlings probably have no difference.The ratio of ZR/ABA is decreased,the ratio of ZR/IAA is firstly decreased and then increased,and the ratio of ABA/(IAA+GA3+ZR) is increased in general.The ratio of ABA/(IAA+GA3+ZR) is slowly decreased at the end of the test,which implicates the tested plants rebuilt a new balance of endogenous hormones while adapting for drought stress,so the tested plants show a growth trend under the new balance of endogenous hormones.The adjustment ability of endogenous hormone has been found in both tissue culture seedling and seed seedling of C.oleifera.The ability probably is the feature in C.oleifera,and also probably is an internal cause of drought tolerant.