Dynamic changes in axillary bud morphology and leaf physiology and biochemistry during the flower bud differentiation stage of Chimonanthus praecox
Research on the flower bud differentiation characteristics can provide theoretical basis for flow-ering period regulation and cultivation management of Chimonanthus praecox.The flowering and non-flow-ering branches of new strain XD-2107 was used as the experimental materials.Phenological and paraffin section observation was used to observe the morphological development changes of axillary buds during flower bud differentiation,and physiological and biochemical indicators such as indole acetic acid(IAA),gibberellin(GA3),abscisic acid(ABA),zeatin nucleoside(ZR),soluble sugar,starch,soluble protein,and carbon nitrogen ratio(C/N)were researched.The results showed that the differentiation of flower buds began in early to mid-May,which was also a critical period for the differentiation.It then goes through the differentiation stages of tepal primordium,stamen primordium and pistil primordium,and began to devel-op slowly from early to mid-July.Low levels of IAA and GA3,high levels of ABA,ABA/GA3,ABA/IAA,ZR/IAA and C/N values were beneficial for the initiation of flower bud differentiation.The content of phytohor-mone and nutrients fluctuated significantly during the differentiation period of stamen and pistil primordi-um.After the sustained high temperature in July,the hormone and nutrient content in the flowering branch leaves approached that of the non-flowering branch leaves or returned to the level of undifferentiated stage,and the flower buds entered a slow development stage.These results indicated that corresponding measures should be taken to regulate and control the flowering of C.praecox and improve the quantity and quality,based on the changes of phytohormone and nutrients.
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