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Targeted Metabolites and Transcriptome Analysis Uncover the Putative Role of Auxin in Floral Sex Determination in Litchi chinensis Sonn.

文献类型： 外文期刊

作者： Chen, Zhe 1 ; Yan, Tingting 1 ; Abbas, Farhat 1 ; Yang, Mingchao 1 ; Wang, Xianghe 1 ; Deng, Hao 3 ; Zhang, Hongna 4 ; Hu, Fuchu 1 ;

作者机构： 1.Hainan Acad Agr Sci, Minist Agr & Rural Affairs, Key Lab Genet Resources Evaluat & Utilizat Trop Fr, Inst Trop Fruit Trees,Key Lab Trop Fruit Tree Biol, Haikou 571100, Peoples R China

2.Hainan Acad Agr Sci, Sanya Res Inst, Sanya 572025, Peoples R China

3.Hainan Acad Agr Sci, Inst Agroprod Proc & Design, Key Lab Trop Fruit & Vegetable Cold Chain Hainan P, Haikou 571100, Peoples R China

4.Hainan Univ, Sch Trop Agr & Forestry, Hainan Prov Key Lab Qual Control Trop Hort Crops, Danzhou 571737, Peoples R China

关键词： litchi; flower bud differentiation; sex of flower; crop production; auxin

期刊名称：PLANTS-BASEL （ 影响因子：4.1； 五年影响因子：4.5 ）

ISSN： 2223-7747

年卷期： 2024 年 13 卷 18 期

页码：

收录情况： SCI

摘要： Litchi exhibits a large number of flowers, many flowering batches, and an inconsistent ratio of male and female flowers, frequently leading to a low fruit-setting rate. Floral sexual differentiation is a crucial phase in perennial trees to ensure optimal fruit production. However, the mechanism behind floral differentiation remains unclear. The objective of the study was to identify the role of auxin in floral differentiation at the transcriptional level. The results showed that the ratio of female flowers treated with naphthalene acetic acid (NAA) was significantly lower than that of the control stage (M0/F0). The levels of endogenous auxin and auxin metabolites were measured in male and female flowers at different stages of development. It was found that the levels of IAA, IAA-Glu, IAA-Asp, and IAA-Ala were significantly higher in male flowers compared to female flowers. Next-generation sequencing and modeling were employed to perform an in-depth transcriptome analysis on all flower buds in litchi 'Feizixiao' cultivars (Litchi chinensis Sonn.). Plant hormones were found to exert a significant impact on the litchi flowering process and flower proliferation. Specifically, a majority of differentially expressed genes (DEGs) related to the auxin pathway were noticeably increased during male flower bud differentiation. The current findings will enhance our comprehension of the process and control mechanism of litchi floral sexual differentiation. It also offers a theoretical foundation for implementing strategies to regulate flowering and enhance fruit production in litchi cultivation.

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