Shikimic acid accelerates phase change and flowering in Chinese jujube  

作　　者：Xianwei Meng Zhiguo Liu Li Dai Weiqiang Zhao Jiurui Wang Lili Wang Yuanpei Cui Ying Li Yinshan Cui Yao Zhang Luyao Wang Fengjiao Yu Jin Zhao Mengjun Liu 

机构地区：[1]Research Center of Chinese Jujube,Hebei Agricultural University,Baoding,Hebei 071000,China [2]College of Horticulture,Hebei Agricultural University,Baoding,Hebei 071000,China [3]College of Life Science,Hebei Agricultural University,Baoding,Hebei 071000,China [4]College of Forestry,Hebei Agricultural University,Baoding,Hebei 071000,China eCollege of Economics and Management,Hebei Agricultural University,Baoding,Hebei 071000,China [5]College of Economics and Management,Hebei Agricultural University

出　　处：《Horticultural Plant Journal》2024年第2期413-424,共12页园艺学报（英文版）

基　　金：partially supported by the National Natural Science Foundation of China (Grant No.31772285);the National Key R&D Program Project Funding (Grant No.2018YFD1000607);Foundation for 100 Innovative Talents of Hebei Province(Grant No.SLRC2019031)。

摘　　要：The juvenile-to-adult phase change with first flowering as the indicator plays a crucial role in the lifecycle of fruit trees. However, the molecular mechanisms underlying phase change in fruit trees remain largely unknown. Shikimic acid (ShA) pathway is a main metabolic pathway closely related to the synthesis of hormones and many important secondary metabolites participating in plant phase change. So,whether ShA regulates phase change in plants is worth clarifying. Here, the distinct morphological characteristics and the underlying mechanisms of phase change in jujube (Ziziphus jujuba Mill.), an important fruit tree native to China with nutritious fruit and outstanding tolerance abiotic stresses, were clarified. A combined transcriptome and metabolome analysis found that ShA is positively involved in jujube(Yuhong’×Xing 16’) phase change. The genes in the upstream of ShA synthesis pathway (ZjDAHPS, ZjDHQS and ZjSDH), the contents of ShA and the downstream secondary metabolites like phenols were significantly upregulated in the phase change period. Further, the treatment of spraying exogenous ShA verified that ShA at a very low concentration (60 mg·L^(-1)) can substantially speed up the phase change and flowering of jujube and other tested plants including Arabidopsis, tomato and wheat. The exogenous ShA (60 mg·L^(-1)) treatment in jujube seedlings could increase the accumulation of endogenous ShA, enhance leaf photosynthesis and the synthesis of phenols especially flavonoids and phenolic acids, and promote the expression of genes (ZjCOs, ZjNFYs and ZjPHYs) involved in flowering pathway. Basing on above results, we put forward a propose for the underlying mechanism of ShA regulating phase change, and a hypothesis that ShA could be considered a phytohormone-like substance because it is endogenous, ubiquitous, movable and highly efficient at very low concentrations. This study highlights the critical role of ShA in plant phase change and its phytohormone-like properties.

关 键 词：Ziziphus jujuba Mill. Phase change FLOWERING Shikimic acid TRANSCRIPTOME METABOLOME 

分 类 号：S665.1[农业科学—果树学]