Flower Bud Differentiation and Endogenous Hormone Changes of Rosa ‘Angela’

doi:10.7525/j.issn.1673-5102.2021.01.005

Abstract

Abstract:

The experiment was conducted to explore the relationship between structure of flower buds and hormones content in Rosa ‘Angela’， and to regulate flowering， to improve landscape quality and breeding work. The flower bud differentiation was divided into five periods within 30 d. The growth cone was conical before the differentiation period. Then the cone became flat， five protrusions appeared around the growth cone at the sepal differentiation period. Multiple petal primordiums and stamen primordiums were respectively appeared around the growth cone during the flower bud differentiation. Several pistil primordiums were appeared at the base of growth cone at pistil differentiation period. The contents of ABA and CTK increased first and then decreased， which contents at sepal primordium differentiation period were significantly higher than other periods. The content of IAA increased gradually trend， and the content of GA decreased gradually. The ratio of IAA/GA and IAA/ABA showed a gradual increasing trend. The ratio of CTK/GA and（ABA+CTK）/GA at sepal primordium differentiation period were significantly higher than that before the differentiation period. The significant increasing of ABA and CTK contents at the sepal primordium differentiation period were related to flower bud induction. Low level of GA and decreasing of IAA were beneficial for flower bud differentiation. The increasing of CTK/GA and（ABA+CTK）/GA ratio at sepal primordium differentiation period were related to the flower bud induction， and high levels of IAA/ABA and IAA/GA ratio may relate to the further development of floral organ primordium.

Key words: Rose, flower bud differentiation, structure, endogenous hormone

CLC Number:

S685.12

Zhi-Yuan LIU, Li ZENG, Xi-Wu DU, PENG-Yong-Zheng, Yi-Wei TAO, Yu-Qing LI, Jun QIN. Flower Bud Differentiation and Endogenous Hormone Changes of Rosa ‘Angela’[J]. Bulletin of Botanical Research, 2021, 41(1): 37-43.

Figures/Tables 5

Table 1

Fig.1

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采样观察时间 Observation time (y.m.d)	花芽分化过程中各时期花芽数 Number of flower buds in each period of flower bud differentiation
采样观察时间 Observation time (y.m.d)	Ⅰ	Ⅱ	Ⅲ	Ⅳ	Ⅴ
2019.03.20	20
2019.03.25	12	6	2
2019.04.04		3	7	7	3
2019.04.09			3	5	12
2019.04.14				2	18
2019.04.19					20

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