Abstract: The physiological and biochemical changes of photo-assimilate translocation in swelling gall of the Zizania latifolia Turcz. were studied with two typical varieties in autumn. The results showed that fresh mass and drymass of gall increased rapidly. The contents of main compositions of non-structural carbohydrate ascended on the whole and descended at anaphase of swelling. Sugar content of‘J iangshujiao's’was higher than that of‘Fenghongzao’. Activity of acid invertase (A I) was high in early stage of development of the gall and then descended rapidly. A I activity in ‘Jiangshujiao's’gall was higher than in ‘Fenghongzao’but N I activity was lower in ‘J iangshujiao's’gall. Activities of sucrose synthase in direction of cleavage were higher than those in synthetic one and keep higher in anaphase. Both activities in ‘Fenghongzao’were higher than those in ‘Jiangshujiao's’. Content of (Z + ZR) was highest and descended distinctively, second was GA₄ , third was IAA and descended relaxedly. Contents of GA₃ and ABA were very low and hardly changed. Hormone contents in ‘Fenghongzao’were higher than those in ‘Jiangshujiao's’. It was considered that it was exceptive that fresh mass and dry mass increased rapidly while activities of physiology and biochemistry decreased rapidly at Zizania gall's swelling. Also there had diversities in different varieties.

Key words: Zizania latifolia, Gall, Non-structural carbohydrate (NSC), Enzyme, Endogenous hormone