Abstract:

Growth status and photosynthesis of 1-year-old seedlings of two provenances of Sapium sebiferum (Zhejiang Lanxi & Fujian Zhangpu) were investigated in a 50-day flooding and waterlogging experiment. The results showed： all plants of provenances of Zhejiang provenances the survived under different stresses,while all plants of Fujian provenances died under the flooding stress and waterlogging stress,and therefore the Zhejiang provenances were more tolerant to the stresser. The growth and photosynthesis of Zhejiang provenances were promoted under the mild water stress,while the height growth and biomass were inhibited and net photosynthetic rate,stomatal conductance and intercellular carbon dioxide concentration were inhibited under the severe water stress (flooding and waterlogging), although there appeared hypertrophied lenticels and adventitious roots on submerged portions of stems. Under flooding stress,the net photosynthetic rate and stomatal conductance of Fujian provenances were decreased,but the intercellular carbon dioxide concentration increased.

Key words: Sapium sebiferum, waterlogging stress, growth, photosynthesis