Changes of Endogenous Hormones and Carbohydrates during Rhizome Formation and Development of Herbaceous Peony
The rhizome of herbaceous peony is the precondition and foundation for plants to regenerate naturally and ramet propagation.It's important to clarify the changes of endogenous hormones and carbohydrates during the formation and development of rhizome of herbaceous peony.The seedlings of herbaceous peony were taken as the materials to observe the morphological changes as well as the changes of endogenous hormones and carbohydrates.The results showed that the formation and development of rhizomes could be divided into four stages:vegetative growth stage(Ⅰ),rhizome transition stage(Ⅱ),expansion stage(Ⅲ)and late expansion stage(Ⅳ).There were many differences in endogenous hormones during the early stages of rhizomes formation and development.The content of ABA and GA3 increased sharply during the rhizome transition stage(Ⅱ),reached the peak(94.96 ng/g and 541.53 ng/g)and then decreased significantly.ABA and GA3 jointly regulated the initial formation of rhizomes.Auxins and cytokinins were highly expressed during the rhizome transition stage(Ⅱ)and expansion stage(Ⅲ),which played a dominant role in the development and expansion of rhizomes.The content of glucose and fructose decreased significantly during the rhizome transition stage(Ⅱ)and maintained a lower level in the late stages.However,the content of sucrose and starch assumed a trend of increasing with the formation and development of rhizomes,which were the main carbohydrates stored and accumulated in rhizomes.
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