植物研究 ›› 2022, Vol. 42 ›› Issue (2): 278-288.doi: 10.7525/j.issn.1673-5102.2022.02.013
刘国彬, 廖婷, 王烨, 郭丽琴, 赵今哲, 姚砚武, 曹均()
收稿日期:
2021-03-04
出版日期:
2022-03-20
发布日期:
2022-02-22
通讯作者:
曹均
E-mail:caochestnut@126.com
作者简介:
刘国彬(1984—),男,助理研究员,主要从事植物种质创新与发育生物学研究。
基金资助:
Guobin Liu, Ting Liao, Ye Wang, Liqin Guo, Jinzhe Zhao, Yanwu Yao, Jun Cao()
Received:
2021-03-04
Online:
2022-03-20
Published:
2022-02-22
Contact:
Jun Cao
E-mail:caochestnut@126.com
About author:
Liu Guobin(1984—),male,research assistant,mainly engaged in the study of plant germplasm innovation and developmental biology
Supported by:
摘要:
金塔柏(Platycladus orientalis ‘Beverleyensis’)是重要的观赏树种。生长素(IAA)、玉米素(ZT)、脱落酸(ABA)和茉莉酸(JA)在金塔柏扦插不定根再生过程中起着重要的调控作用,但不同发育阶段内源激素的动态变化及其对不定根发生的影响仍不清楚。以金塔柏半木质化枝条为材料,采用连续组织切片技术观察了不定根发生过程,利用高效液相色谱串联质谱法检测了4种内源激素含量的动态变化。结果表明,金塔柏不定根原基起源于愈伤组织、髓射线、木质部、维管形成层、次生韧皮部、皮层、髓射线与形成层交界处等部位,属于多位点发生模式和多类型生根方式。在不定根形成过程中,随着愈伤组织的形成,IAA和ZT含量下降,ABA和JA含量升高;随着根原基的分化,IAA和ZT含量缓慢升高,ABA和JA含量下降;随着不定根形成与伸长,IAA、ZT、JA逐渐升高,ABA维持在低水平。激素平衡分析发现,IAA/ABA比值和IAA/JA比值下降、IAA/ZT比值上升利于愈伤组织的形成,反之利于根原基的诱导分化,而IAA/ABA比值升高,IAA/ZT和IAA/JA维持在较低水平利于不定根形成与伸长。研究结果为揭示不同内源激素对金塔柏扦插不定根再生的调节作用提供了依据。
中图分类号:
刘国彬, 廖婷, 王烨, 郭丽琴, 赵今哲, 姚砚武, 曹均. 金塔柏扦插不定根形成与内源激素的调控研究[J]. 植物研究, 2022, 42(2): 278-288.
Guobin Liu, Ting Liao, Ye Wang, Liqin Guo, Jinzhe Zhao, Yanwu Yao, Jun Cao. Regulation Mechanism of Endogenous Hormones in Adventitious Roots Formation of Platycladus orientalis ‘Beverleyensis’[J]. Bulletin of Botanical Research, 2022, 42(2): 278-288.
图2
人工诱导金塔柏扦插生根过程中的组织结构变化Xy.木质部;Vc.维管形成层;Ph.韧皮部;Co.皮层;Ep.表皮;Rp.根原基;Ca.愈伤组织;Pi.髓;Pr.髓射线;Ar.不定根;Rc.根冠;0 d.插穗基本结构(10×);20 d.韧皮部与皮层中产生根原基(20×);35 d.愈伤组织中产生根原基(20×);45 d.木射线细胞分化形成根原基(20×);50 d:愈伤组织内部不断独立分化形成根原基(20×);60 d.来自髓射线的不定根原基进入皮层,同时在木质部伴随不定根原基的产生(20×);70 d.愈伤组织中产生大量不定根原基(10×);75 d.不定根伸出体外(4×);80 d.皮层和髓射线与形成层交叉处不定根原基正在发育(10×);90 d.不定根原基形成与发育,不定根形成同时存在(4×);120 d-A.不定根原基在形成层产生(20×);120 d-B.不定根原基突破皮层(10×);120 d-C.愈伤组织中产生的不定根原基(20×);120 d-D.不定根突破愈伤组织伸出(4×);120 d-E.伸出中的不定根(4×);120 d-F.伸长中的不定根(4×)
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