Abstract: Endogenous hormone levels in the pericarp and the fruit mass were comparatively studied between the fruits from early and late blooms on the same panicles of ‘Feizixiao’litchi . The results showed that fresh mass of the early-bloom fruit was significantly larger than that of late2bloom , and contents of GA_{1 + 3} 、IAA , ABA and IAA/ABA ratio in the pericarp from early-bloom fruit were lower than those from late-bloom fruit , whereas , ZRs level and ZRs/ ABA ratio were higher during fruit development . It is suggested that higher ZR_s level and ZRs/ ABA ratio are associated with the formation of larger fruit size in early bloom , while higher IAA level and IAA/ ABA ratio might be related to higher fruit set for the fruit from late bloom.

Key words: Litchi (Litchi chinensis Sonn. ), Bloom period, Fruit size, Endogenous hormone, Pericarp