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YUAN Gao Feng WANG Qiao Mei (Institute of Vegetable, Zhejiang University, Hangzhou 310029)  
Carpel development in cucumber male flowers was studied by morphological, histo-chemical and isoenzyme electrophoretic analyses. The results showed that; (1) cell number of the carpel in male flowers increased continuously during the development of male flowers, and the carpel in male flowers was abundant in RNA content; (2) the carpel in male flowers at latter developmental stage was differentiated, and a placenta-like structure was formed in the carpel of male flowers during anthesis, while the ovule did not appear as that of mature female flowers; (3) The POD and esterase isoenzyme electrophoretic profiles of carpel varied from the development of male flowers, which further indicated that the carpel in mature male flowers was no longer at the stage of primordium. It could be deduced from the results that carpel of cucumber male flowers develops continuously in a distinct pattern with that of female flowers during sex expression process.
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