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Spatio-temporal dynamics of phytohormones in the tomato graft healing process

Horticultural Plant Journal 2024年第6期10卷 1362-1370页

作者： Duan Y. Zhang F. Meng X. Shang Q. State Key Laboratory of Vegetable Biobreeding Institute of Vegetables and Flowers Chinese Academy of Agricultural Sciences Beijing 100081 China

graft healing involves a series of cytological and molecular events including wound responses, callus formation and vascular bundle remodelling. Hormones are important signalling molecules regulating plant development and responses to environmental stimuli. However, the detailed dynamics of phytohormones in graft healing remain elusive. In this research, internodes above and below the graft site were harvested from 0 to 168 h after grafting (HAG), and liquid chromatography tandem mass spectrometry (LC-MS/MS) was used to determinate jasmonic acid, auxin, cytokinin, ethylene, salicylic acid, abscisic acid and gibberellin levels during the graft healing process. Uniform manifold approximation and projection (UMAP) and k-means analyses were performed to explore hormone spatio-temporal dynamics. We found the stage-specific and asymmetric accumulation of phytohormones in the tomato graft healing process. At the early healing stage (before vascular bundle reconnection), IAA, cZ, ABA, JA and SA mainly accumulated above the graft site, while tZ and ACC mainly accumulated below the graft site. MEIAA, ICAld and IP mainly accumulated at the later stage. Comminated with the healing process, we suggested that JA is mainly involved in wound responses, IAA is beneficial to the formation of callus and vascular cell development, tZ promotes cell division, and IP is linked to vascular bundle remodelling. In addition, expression of JA-related genes SlMYC2 and SlJAZ2, IAA-related gene SlIAA1, tZ-related genes SlHP2 and SlRR8, and IP-related gene SlRR9 correlated with hormone accumulation. The findings provide important information about the hormones and genes involved in the tomato graft healing process. © 2023 Chinese Society for Horticultural Science (CSHS) and Institute of Vegetables and Flowers (IVF), Chinese Academy of Agricultural Sciences (CAAS).

关键词： Gene graft healing Phytohormone Tomato Uniform manifold approximation and projection

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Advances in Activity of Related Enzymes during graft healing Process of Citrus Paradisi Macf

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Agricultural Science & Technology 2011年第10期12卷 1472-1476页

作者：严毅高柱何承忠李贤忠西南林业大学资源学院云南昆明650224

The distribution and ecological characters of grapefruit were analyzed mainly,and the research trends of stock and scion selection for grafting,the healing-anatomy process and enzymology were summarized *** results indicated that the range of stock and scion apolegamy decreased through the application of molecular *** the study on stock variety and scion selection was still in need of expanding and the key enzyme played a vital role in the healing of the stock and scion,which provided a chance for the regulation and control of healing force by hormones and also provided a theoretical basis for the regulation of gene.

关键词： Grapefruit graft healing Enzyme activity

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