南京林业大学学报(自然科学版) ›› 2024, Vol. 48 ›› Issue (5): 97-104.doi: 10.12302/j.issn.1000-2006.202301007

• 研究论文 • 上一篇    下一篇

白玉兰二次开花诱导与生理调控研究

陈香波1(), 张冬梅1,*(), 傅仁杰1, 张浪1, 申亚梅2, 罗玉兰1, 尹丽娟1   

  1. 1.上海市园林科学规划研究院,上海城市困难立地绿化工程技术研究中心,上海 200232
    2.浙江农林大学风景园林与建筑学院,浙江 杭州 311302
  • 收稿日期:2023-01-06 修回日期:2023-03-15 出版日期:2024-09-30 发布日期:2024-10-03
  • 通讯作者: * 张冬梅(zdm@shsyky.com),教授级高级工程师。
  • 作者简介:

    陈香波(cxb7210@163.com),高级工程师。

  • 基金资助:
    上海市科委重点研发项目(22dz1202200);上海市科委重点研发项目(20dz1203700);上海市绿化和市容管理局(林业局)科研专项(G200203)

Induction and physiological regulatory mechanism of secondary flowering in Yulannia denudata

CHEN Xiangbo1(), ZHANG Dongmei1,*(), FU Renjie1, ZHANG Lang1, SHEN Yamei2, LUO Yulan1, YIN Lijuan1   

  1. 1. Shanghai Academy of Landscape Architecture Science and Planning, Shanghai Engineering Research Center of Landscaping on Challenging Urban Sites, Shanghai 200232, China
    2. School of Landscape Architecture, Zhejiang Agriculture and Forestry University, Hangzhou 311302, China
  • Received:2023-01-06 Revised:2023-03-15 Online:2024-09-30 Published:2024-10-03

摘要:

【目的】通过人工诱导实现白玉兰(Yulania denudata)二次开花,以探明白玉兰花芽分化与开花诱导的生理调控机制。【方法】采用施用营养肥与激素处理白玉兰植株,进行花芽发育石蜡切片观察,并测定不同时期花芽内源激素含量。【结果】5月上旬随着营养生长趋于减缓,白玉兰起始花芽分化,至6月上旬花芽分化基本完成;单独采用外源激素(6-BA、GA3)或配合施用营养肥(N、P、K、糖),可诱导白玉兰当年二次开花,二次开花株率33%~100%,单株最大开花量22;花芽分化成熟过程中,内源GA3与ABA含量升高,而打破休眠、开花的花芽内脱落酸(ABA)含量下降,内源生长素类激素(IAA、ME-IAA)含量升高;较未开花对照,外源细胞分裂素处理株花芽内ME-IAA、IPA、JA-Ile、JA含量较高,外源赤霉素(GA3)处理株内源tZR、GA1、GA3含量较高。【结论】外源激素可不依赖于营养处理直接诱导白玉兰二次开花,不同激素诱导白玉兰二次开花可能存在不同的开花调控通路。

关键词: 白玉兰, 花芽分化, 二次开花, 生理调控, 营养, 激素

Abstract:

【Objective】The aim of this study was to achieve the secondary flowering of Yulannia denudata through artificial induction and to explore the physiological regulation mechanism of flower bud differentiation and flowering induction in Y. denudata.【Method】Y. denudata plants were treated with nutrients and hormones. Flower buds were embedded in paraffin and sectioned to observe flower bud development, and endogenous hormone contents in flower buds at different stages were measured.【Result】Flower bud differentiation of Y. denudata began in early May when vegetative growth slowed down and was completed by early June. Secondary flowering within the same year was induced via treatment with exogenous hormones [6-benzylaminopurine (6-BA) and gibberellin A3 (GA3)] alone or in combination with nutrient applications [nitrogen (N), phosphorus (P), potassium (K) and sugars]. The secondary flowering rate ranged from 33% to 100%, with the maximum of 22 flowers per plant. During the maturation of flower bud differentiation, the levels of endogenous GA3 and abscisic acid (ABA) increased. The ABA content in flower buds decreased while breaking dormancy and flowering, whereas the content of endogenous auxins (indole-3-acetic acid (IAA) and methylindole-3-acetic acid (ME-IAA) increased. Flower buds treated with exogenous cytokinins had higher levels of ME-IAA, IPA, jasmonoyl-l-isoleucine (JA-Ile) and jasmonate (JA), while flower buds treated with exogenous gibberellins (GA3) had higher levels of endogenous trans-zeatin riboside (tZR), gibberellin A1 (GA1), and GA3. 【Conclusion】Exogenous hormones directly induce secondary flowering in Y. denudata without relying on nutrient treatments. Thus, different hormones may induce secondary flowering through various regulatory pathways.

Key words: Yulannia denudata, differentiation of flower bud, secondary flowering, physiological regulation, nutrition, hormone

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