Spring wheat (cv. 7742) and winter wheat (cv. Nongda 015) were vernalized by seed chilling, and the changes of GAs, ABA content and GAs / ABA ratio in embryo were investigated. The differences between cultivars, treatments and variety-treatment interactions were significant for both GAs and ABA. The level of GAs and ABA as well as GAs / ABA ratio were hardly changed by seed chilling in spriug wheat However, in winter wheat, the GAs content decreased much less compared with ABA that reduced sharply after chilling. It showed that the GAs / ABA ratio in winter wheat was increased remarkably (4.55 times) than in spring wheat. It was suggested that the absolute GAs level was independent of the vernalization effect because there was a higher GAs level before and after seed chilling in winter wheat when compared with spring wheat, One of the vemalization effects was the decline of ABA level that led to the increase of GAs / ABA ratio.
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