In one year growth period of ten years aged Fengshui pear trees,the endogenous hormones contents of leaves and blossom buds were determined before spring florescence,in stage of summer flower bud differentiation and the secondary blooming in autumn. The results showed the close relationship between the endogenous hormones contents and growing development of leaves and blossom buds. While the lower level of IAA in buds was advantageous to flower bud differentiation and to flower buds open in spring in the se...
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