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Metabolomics Analysis of Litchi Leaves during Floral Induction Reveals Metabolic Improvement by Stem Girdling

文献类型： 外文期刊

作者： Su, Zuanxian 1 ; Xiao, Qiushen 1 ; Shen, Jiyuan 1 ; Chen, Houbin 1 ; Yan, Shijuan 2 ; Huang, Wenjie 2 ;

作者机构： 1.South China Agr Univ, Coll Hort, Guangdong Litchi Engn Res Ctr, Guangzhou 510642, Peoples R China

2.Guangdong Acad Agr Sci, Agrobiol Gene Res Ctr, Guangzhou 510640, Peoples R China

关键词： stem girdling; flowering; young leaves; metabolic profiling; Litchi chinensis Sonn

期刊名称：MOLECULES （ 影响因子：4.412； 五年影响因子：4.588 ）

ISSN：

年卷期： 2021 年 26 卷 13 期

页码：

收录情况： SCI

摘要： Prolonged exposure to cold temperatures often results in a relatively low flowering rate in litchi (Litchi chinensis Sonn.) trees with younger leaves. This study aimed to verify the impact of stem girdling on litchi flowering by identifying and characterizing the induced metabolic changes. After a 60 day exposure to cold treatment at 15 degrees C/10 degrees C (12 h/12 h), the flowering rate of the girdled trees was 100%, while that of the non-girdled trees was 20%, indicating that girdling improved litchi flowering at its turning stage. The metabolic profiles of litchi leaves with and without stem girdling during floral induction were compared and 505 metabolites potentially associated with litchi flowering were detected. Most metabolites were involved in the metabolism of starch and sucrose, fatty acid, and phenylpyruvic acid. The metabolic pathways concerned with the biosynthesis of epinephrine, sucrose, and d-maltose were induced in leaves after girdling treatment. The level of galactitol, phenylpyruvic acid, acetyl-CoA, linoleic acid, alpha-linolenic acid, and 13-HPOT biosynthesis remained stable in the leaves from girdled trees but changed drastically in the leaves from non-girdled trees. In addition, 379 metabolites concerning flowering rate were characterized. Metabolism pathways of starch and sucrose, galactose, and linoleic acid are of great significance to the flowering of litchi. Linoleic acid exhibited the most significant variations between girdled trees and non-girdled trees with fold changes of up to 13.62. These results contribute to understanding the biological mechanism of litchi floral induction and the metabolic changes after stem girdling.

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