Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2021, Vol. 42 ›› Issue (10): 2942-2951.DOI: 10.3969/j.issn.1000-2561.2021.10.026

• Plant Cultivation, Physiology & Biochemistry • Previous Articles     Next Articles

Effect of Exogenous Gibberellin Signal on Sugarcane Tillering and Its Endogenous Hormones

LI Zhengying1, QIU Lihang2, YAN Haifeng2, ZHOU Huiwen2, CHEN Rongfa2, FAN Yegeng2, LIANG He1,*(), WU Jianming2,*()   

  1. 1. College of Agriculture, Guangxi University, Nanning, Guangxi 530005, China
    2. Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences / Sugarcane Research Center, Chinese Academy of Agricultural Sciences / Key Laboratory of Sugarcane Biotechnology and Genetic Improvement Guangxi, Ministry of Agriculture and Rural Affairs / Guangxi Key Laboratory of Sugarcane Genetic Improvement, Nanning, Guangxi 530007, China
  • Received:2020-12-28 Revised:2021-02-23 Online:2021-10-25 Published:2021-11-25
  • Contact: LIANG He,WU Jianming

Abstract:

Previous studies found that the exogenous GA signal affected sugarcane tillering process. In order to understand the effect of GA signal on the content of endogenous hormones in leaves at different time of tillering stage of sugarcane, this experiment used the main sugarcane variety ‘Guitang 42’ with excellent comprehensive traits as the plant material, and different exogenous GA signal regulators were used to soak the seedcanes with water treatment as the control (CK). The endogenous hormones indole-3-acetic acid (IAA) and gibberellins (GA), ethylene (ETH), cytokinin (CTK), abscisic acid (ABA) and brassinosteroids (BR) content in +1 leaves (main seedling + tiller seedling) at the early, full and late tillering stages were analyzed and the correlations between them were statistically tested. The results showed that after soaking sugarcane seedcanes with exogenous GA3 (Gibberellic acid 3; GA biosynthesis promoter), the total contents of IAA, GA and CTK in the tiller leaves was increased at the tillering stage, and the ETH content at the early stage and the ABA content at late tillering stage were increased. Paclobutracol (Paclobutracol, PP333; GA biosynthesis inhibitor) treatment increased the endogenous GA and ABA contents before tillering, and the ETH content at the later tiller leaves, but reduced the CTK and BR contents. Further correlation analysis found that in the treatment with exogenous gibberellin signal enhancer, the endogenous hormones of sugarcane leaves IAA and GA, CTK and BR, CTK and GA showed a significant positive correlation while ABA showed a significant negative correlation with GA but a significant positive correlation with ETH. The exogenous GA signal affected the endogenous hormone system in the leaves of sugarcane at the tillering stage, and the growth-promoting hormones and the growth-inhibiting hormones reached a dynamic equilibrium state, which ultimately led to the difference in the tillering. It is concluded that sugarcane tillering is closely related to the contents of plant endogenous hormones. Exogenous hormones could be used to influence the contents of endogenous hormones, regulate the dynamic balance between hormones, and achieve the purpose of improving sugarcane tiller formation and its stem formation.

Key words: Saccharum officinarum, plant growth regulator, gibberellin, paclobutrazol, seedcane soaking, tiller, endogenous hormones

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