Analysis on the response of petunia and tomato's flowering and main stem elongation under blue and red light conditions.

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We evaluated the effects of light quality of blue and red light on growth and development of petunia. The plant shape became longer and flowering was promoted under blue light compared to red light. Under red light condition, GA synthesis was inhibited and it could lead the short main stem. Under red light that delayed floral induction, cytokinin could induce the flowering. In addition, we found out the FT like gene, 'PhFT' from petunia plant. This gene dose not seems to be related to light quality response on floral induction, but we could confirm that this gene could induce the floral bud formation by using the transgenic Arabidopsis. We also investigated the effects of light quality on growth and floral induction in tomato, and showed that tomato's floral induction was promoted by red light condition.