What are the characteristics of raspberry flower bud differentiation?

Flower bud differentiation of raspberry: According to the observation of Huang Qingyuan (1997) on American 22 and Australian red berries, flower bud differentiation began at the end of August and reached its peak in the middle and late September, lasting about 60-70 days. It is characterized in that the growth point of the new shoot bulges upward into a hemisphere, 10 enters the inflorescence primordium differentiation stage from early June to early April, and the leaves expand with the germination of winter buds. However, Tan Yu and others observed the variety of Little Red Marin in Harbin, and found that there were no flower buds on the branches that year. The flower buds began to differentiate in early May, and it took only 30-40 days from the beginning of differentiation to the beginning of flowering, which was probably the differentiation period of inflorescence primordium, not the beginning of flower bud differentiation. Because the fruiting mother branch of red raspberry is longer and there are more buds on the branch, each bud can form 12 ~ 13 inflorescence after stretching, and the flower bud differentiation lasts longer. Inflorescence is limited, the top flower differentiates first, and the flowers are produced from top to bottom in turn. Flower bud differentiation can be divided into four stages: undifferentiated stage (leaf bud stage), inflorescence primordium differentiation, floret differentiation and sex organ formation stage. Huang Qingyuan's conclusion is similar to that of the former Soviet Union. On August 30th, "New Kuzmin Raspberry" was used for flower bud differentiation and growth point expansion. In September 10, there were small tumor-like processes, and in September 165438+ 10, there were carpels and central cones.1October 20th to May.