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Phytohormones and candidate genes synergistically regulate fruitlet abscission in Areca catechu L.

文献类型： 外文期刊

作者： Li, Jia 1 ; Chen, Yunche 2 ; Zhou, Guangzhen 1 ; Li, Meng 3 ;

作者机构： 1.Hainan Univ, Coll Trop Crops, Hainan Key Lab Sustainable Utilizat Trop Bioresour, Haikou 570228, Peoples R China

2.Chinese Acad Trop Agr Sci, Coconut Res Inst, Wenchang 571339, Hainan, Peoples R China

3.Cent South Univ Forestry & Technol, Coll Life Sci & Technol, Changsha 410004, Hunan, Peoples R China

关键词： Phytohormone; Transcriptome; Fruitlet abscission; Areca catechu L.

期刊名称：BMC PLANT BIOLOGY （ 影响因子：5.3； 五年影响因子：5.9 ）

ISSN： 1471-2229

年卷期： 2023 年 23 卷 1 期

页码：

收录情况： SCI

摘要： BackgroundThe fruit population of most plants is under the control of a process named "physiological drop" to selectively abort some developing fruitlets. However, frequent fruitlet abscission severely restricts the yield of Areca catechu. To reveal the physiological and molecular variations in this process, we detected the variation of phytohormone levels in abscised and non-abscised fruitlets in A. catechu.ResultsThe levels of gibberellin acid, jasmonic acid, salicylic acid, abscisic acid and zeatin were elevated, while the indole-3-acetic acid and indole-3-carboxaldehyde levels were declined in the "about-to-abscise" part (AB) of abscission zone (AZ) compared to the "non-abscised" part (CK). Then the differentially expressed genes (DEGs) between AB and CK were screened based on transcriptome data. DEGs involved in phytohormone synthesis, response and transportation were identified as key genes. Genes related to cell wall biosynthesis, degradation, loosening and modification, and critical processes during fruit abscission were identified as role players. In addition, genes encoding transcription factors, such as NAC, ERF, WRKY, MADS and Zinc Finger proteins, showed differentially expressed patterns between AB and CK, were also identified as candidates.ConclusionsThese results unraveled a phytohormone signaling cross talk and key genes involved in the fruitlet abscission process in A. catechu. This study not only provides a theoretical basis for fruitlet abscission in A. catechu, but also identified many candidate genes or potential molecular markers for further breeding of fruit trees.

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