期刊
JOURNAL OF PLANT PHYSIOLOGY
卷 258, 期 -, 页码 -出版社
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2021.153364
关键词
Longan; Genome-wide identification; DEAD-box; Somatic embryogenesis; Seed development
资金
- National Natural Science Foundation of China [31572088, 31672127]
- Major Projects Plan of Science and Technology in Fujian Province [2015NZ0002-1]
- New Century Excellent Talents program of university in Fujian Province [20151104]
- Special fund for scientific and technological innovation of Fujian Agricultural and Forestry University Applied Basic Research [CXZX2017189]
- [CXZX2017314]
- [102/71201801101]
DEAD-box (DDX) proteins play a crucial role in RNA metabolism across the animal, plant, and microorganism kingdoms. Some DlDDX in longan show high sequence similarity with Mus musculus, Citrus, and Saccharomyces cerevisiae. Additionally, some DlDDX genes may interact with proteins involved in miRNA biosynthesis during early SE, and contribute to DNA demethylation and stress responses.
DEAD-box (DDX) proteins belong to the largest subfamily of RNA helicase SF2, which contributes to all biological processes of RNA metabolism in the plant kingdom. Till now, no significant data are available regarding studies on DDX in Somatic Embryogenesis (SE) of woody plants. It is important to investigate the biological function of the DlDDX family in longan SE. Thus, a comprehensive analysis of 58 longan DEAD-box (DlDDX) genes characterization was performed by genome-wide identification and transcript abundance validation analysis. Homologous evolution has revealed that some DlDDXs in longan had high sequence similarity with Mus musculus, Citrus and Saccharomyces cerevisiae, indicating that DlDDXs were highly conservative in the animal, plant, and microorganism. Remarkably, gene duplication, purifying selection, and alternative splicing events, and new auxiliary domains have likely contributed to the functional evolution of DlDDX, indicating that DlDDX appeared neofunctionalization in longan. Besides, DlDDX3, 15, 28, 36 might interact with protein complex (MAC3A, MAC3B, CDC5, CBP20) of miRNA biosynthesis. Notably, DlDDX28 contained a novel auxiliary domain (CAF-1 p150), which might contribute to DNA demethylation in longan early SE. 4 DlDDX genes significantly expressed not only in early SE and zygotic embryogenesis (ZE) but also up-regulated at high levels in 'Honghezi' and 'Quanlongbaihe' with abortive seeds, which are of great significance. Moreover, some DlDDXs presented abiotic stress-response dynamic expression patterns by ABA, SA, JA, and NaCl treatments during early SE. Hence, DEADbox is essential to SE development and seed abortive in longan.
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