Spermidine participation in the regulation of floral bud differentiation in chrysanthemum (Chrysanthemum x morifolium)
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Abstract
This paper studies the changing rule of endogenesis spermidine (Spd) content in autumn-cutting
chrysanthemum Jinba' in apical buds and leaves during floral bud differentiation, meanwhile analyses
the effects of Spd and dicyclohexylamine (DCHA) on the process of floral bud differentiation of Jinba'
as well as the changing rule of carbohydrates and soluble protein content. The results showed that, high
levels of Spd in apical buds was accumulated during the initiative stage of floral bud differentiation and
the stage of floret primordia differentiation, while the levels of Spd in leaf were lower. After short day
treatment, the content of carbohydrates increased and the content of soluble protein decreased. The
content of carbohydrates and soluble protein were increased by exogenous Spd, promoting the soluble
protein reached its highest levels in advance, then promoted floral bud differentiation. The DCHA
treatment had the opposite result compared with Spd. These results provide a theoretical basis for the
development of chrysanthemum.
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