Genome-Wide Investigation of NAC Family Genes Potentially Related to SCW Biogenesis in Korla Pear Fruit

文献类型： 外文期刊

第一作者： Tusong, Kuerban

作者： Tusong, Kuerban;Mamat, Aisajan;Xu, Juan

作者机构：

关键词： Korla pear fruit; Secondary cell wall; Genome; NAC family; Gene expression

期刊名称：PLANT MOLECULAR BIOLOGY REPORTER （ 影响因子：1.816； 五年影响因子：2.011 ）

ISSN： 0735-9640

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收录情况： SCI

摘要： Korla pear (Pyrus sinkiangensis Yu) is a native species of Xinjiang, China. Nowadays, the formation of rough-skinned fruits is becoming one of the main factors that adversely affect the fruit quality. The rough-skin phenotype is caused by an excessive accumulation of stone cells in pear fruits. Like fibers, the stone cells are formed by secondary thickening of cell walls, which is regulated by NAC and MYB family transcription factors (TFs) as master switches. In this work, we have mainly investigated NAC family genes in pear genome and found 158 TFs that belong to this family. Among them, nineteen genes were highly homologous with secondary cell wall (SCW) master switches in Arabidopsis. By analyzing transcriptome data from different stages of fruit development (early, late, and stationary stage of stone cell differentiation), twenty-three NAC members were found to be differentially expressed. Among them, nine genes were homologs of Arabidopsis SCW master switches and the rest were clustered in expression patterns with these genes. Among these nine genes, five of them were VND genes which regulate the vessel development, and the rest were annotated as NST2 and SND2 that involve in the fiber differentiation. In other 14 genes, five of them were the homologs of NAC83 and NAC104 that represses VNDs, and the rest of them were the homologs of membrane-bound NACs (NTM1, NTL6, and NTL8) that involve in plant responses to diverse stresses and developmental signals. The gene expression quantification indicated that fiber-specific SNDs and negative regulators of VNDs were upregulated in rough-skinned fruits.

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