Quantitative proteomics of pomegranate varieties with contrasting seed hardness during seed development stages

文献类型： 外文期刊

第一作者： Niu, Juan

作者： Niu, Juan;Li, Haoxian;Xue, Hui;Chen, Lina;Liu, Beibei;Cao, Shangyin;Cao, Da

作者机构：

关键词： Pomegranate;Seed hardness;Proteomics;Seed developmental stages;Gene expression

期刊名称：TREE GENETICS & GENOMES （ 影响因子：2.297； 五年影响因子：2.547 ）

ISSN： 1614-2942

年卷期： 2018 年 14 卷 1 期

页码：

收录情况： SCI

摘要： In pomegranate (Punica granatum), seed hardness is an important trait directly affecting fruit marketability. However, seed formation in pomegranate has not been well studied. We investigated the genetic mechanism underlying pomegranate seed hardness by comparing protein expression profiles between soft-and hard-seeded varieties 60 and 120 days after flowering. We identified 1940 proteins, of which 399 were differentially expressed. Most of the differentially expressed proteins were involved in posttranslational modification and carbohydrate metabolism. Cell wall biosynthesis, which showed positive correlations with seed hardness, was selected as the candidate pathway. The mRNA levels of 14 proteins involved in cell wall biosynthesis were further analyzed by qPCR. Lignin biosynthesis-related differentially expressed proteins showed lower expression at protein and gene levels in a soft-seeded variety at the early stages. Moreover, cellulose biosynthesis-related differentially expressed proteins showed higher expression levels in the soft-seeded variety at 60 days after flowering. Thus, the soft-seeded variety showed lower lignin but higher cellulose biosynthesis at the early fruit developmental stage, suggesting that lignin and cellulose play opposing roles in cell wall formation in pomegranate seeds. Moreover, differentially expressed proteins involved in cell wall degradation showed higher expression levels in the soft-seeded variety at both developmental stages. These results suggested that differences in seed hardness between soft-and hard-seeded pomegranates might result from cell wall biosynthesis and also be affected by cell wall degradation. The present proteome-wide profiling of pomegranate genotypes with contrasting seed hardness adds to the current knowledge base of the molecular basis of seed hardness development.

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