Abstract：In order to investigate the effects of natural low temperature on 4 kinds of endogenous hormones（IAA，GA4，ZR，ABA）contents during parthenocarpic eggplant（Solanum melongena L.）ovary（fruit）development，and the relationship between endogenous hormones and eggplant fruit development，the parthenocarpic line D-10，D-21 and non-parthenocarpic line 03-2 were examined at different temperature conditions．The results showed that the changing trend of IAA，ZR and ABA contents during fruit development were similar among different temperature conditions．IAA，ZR and ABA contents were higher in the early stage of fruit development than that in the later stage of fruit development．Low temperature could significantly decrease IAA content at later stage of fruit development．But its effect on the IAA content at early stage of fruit development was varied with different genotypes．Low temperature could significantly decrease IAA content of non-parthenocarpic line 03-2 at the early flowering stage，which indicated that low temperature went against IAA synthesis of non-parthenocarpic line 03-2．No evident regularity was found in the effect of temperature on GA4 contents in fruit development of different genotypes．The effects of temperature on ZR and ABA contents were occurred at early stage of fruit development．In the flowering stage，when the daily minimum temperature was 14.3 ℃，ZR synthesis was blocked，whereas ABA content was increased significantly．Higher IAA and ABA levels at early stage of fruit development were beneficial to eggplant fruit development and parthenocarpy．However，GA4 and ZR may have no relation to eggplant parthenocarpy．
