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Transcriptional analysis reveals potential genes and regulatory networks involved in salicylic acid-induced flowering in duckweed (Lemna gibba)

文献类型： 外文期刊

作者： Fu, Lili 1 ; Tan, Deguan 1 ; Sun, Xuepiao 1 ; Ding, Zehong 1 ; Zhang, Jiaming 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Hainan Bioenergy Ctr, Inst Trop Biosci & Biotechnol, MOA Key Lab Trop Crops Biol & Genet Resources, Xueyuan Rd 4, Haikou 571101, Hainan, Peoples R China

2.Chinese Acad Trop Agr Sci, Hainan Inst Trop Agr Resources, Hainan Key Lab Protect & Utilizat Trop Bioresourc, Xueyuan Rd 4, Haikou 571101, Hainan, Peoples R China

关键词： flowering; Lemna gibba; Photoperiod; salicylic acid; Abscisic acid; transcriptome analysis

期刊名称：PLANT PHYSIOLOGY AND BIOCHEMISTRY （ 影响因子：4.27； 五年影响因子：4.816 ）

ISSN： 0981-9428

年卷期： 2020 年 155 卷

页码：

收录情况： SCI

摘要： Duckweed is a simple aquatic floating plant having great potential in sewage treatment and bioenergy production. Duckweed rarely flowers in nature, which greatly limits its germplasm collection, conservation, and heterosis usage. Salicylic acid (SA) can efficiently induce flowering of duckweed (e.g., Lemnagibba); however, the related genes and regulatory networks remain unclear. In this work, we demonstrated that L. gibba flowering induced by SA was photoperiod-dependent, stress-involved, and abscisic acid (ABA)-disrupted. Totally 202, 78, and 413 differentially expressed (DE) genes were up-regulated, while 429, 72, and 307 were down-regulated at flower induction, flower initiation, and flowering stages, respectively. At the flower induction stage, the downregulated genes were mainly involved in cell wall, auxin and ABA, light reaction, and abiotic stress, while the upregulated genes were involved in development, brassinosteroid, major CHO metabolism, and redox. At the flower initiation stage, the down-regulated genes were enriched in light reaction and lipid metabolism, whereas the upregulated genes were enriched in starch degradation and Ca2+ signaling. At the flowering stage, the downregulated genes were significantly enriched in photosynthesis, gibberellic acid, starch synthesis, nitrogen metabolism, and redox, while the up-regulated genes were enriched in cell wall, jasmonic acid, secondary metabolism, and Ca2+ signaling. Besides, 46 transcription factors and 13 flowering-related DE genes were identified. Finally, a possible floral pathway, where LgTEMI, LgSVP, and LgET1 might play critical roles in SA-induced flowering in L. gibba, was discussed. These findings provide a useful foundation for further investigation of genes and regulatory networks of SA-induced flowering in duckweed.

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