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Transcriptome analysis reveals the effects of grafting on sweetpotato scions during the full blooming stages

文献类型： 外文期刊

作者： Wei, Changhe 1 ; Li, Ming 1 ; Qin, Jia 1 ; Xu, Yunfan 1 ; Zhang, Yizheng 1 ; Wang, Haiyan 1 ;

作者机构： 1.Sichuan Univ, Key Lab Bioresources & Ecoenvironm, Sichuan Key Lab Mol Biol & Biotechnol, Minist Educ,Coll Life Sci, Chengdu 610064, Sichuan, Peoples R China

2.Sichuan Acad Agr Sci, Inst Biotechnol & Nucl Technol, Chengdu 610061, Sichuan, Peoples R China

关键词： Sweetpotato; Grafting; Iso-Seq; Flowering; Transcriptome

期刊名称：GENES & GENOMICS （ 影响因子：1.839； 五年影响因子：1.329 ）

ISSN： 1976-9571

年卷期： 2019 年 41 卷 8 期

页码：

收录情况： SCI

摘要： BackgroundSweetpotato (Ipomoea batatas) is a hexaploid plant and generally most genotypes do not flower at all in sub-tropics. Heterografting was carried out between sweetpotato cultivar Xushu 18' and Japanese morning glory (Ipomoea nil). With sweetpotato as scion' and I. nil as rootstock', sweetpotato was induced flowering in the autumn. However, little is known about the molecular mechanisms underlying sweetpotato responses to grafting, especially during the full blooming stages.ObjectivesTo investigate the poorly understood molecular responses underlying the grafting-induced phenotypic processes in sweetpotato at full anthesis.MethodsIn this study, to explore the transcriptome diversity and complexity of sweetpotato, PacBio Iso-Seq and Illumina RNA-seq analysis were combined to obtain full-length transcripts and to profile the changes in gene expression of five tissues: scion flowers (SF), scion leaves (SL), scion stems (SS), own-rooted leaves (OL) and own-rooted stems (OS).ResultsA total of 138,151 transcripts were generated with an average length of 2255bp, and more than 72% (100,396) of the transcripts were full-length. During full blooming, to examine the difference in gene expression of sweetpotato under grafting and natural growth conditions, 7905, 7795 and 15,707 differentially expressed genes were detected in pairwise comparisons of OS versus SS, OL versus SL and SL versus SF, respectively. Moreover, differential transcription of genes associated with anthocyanin biosynthesis, light pathway and photosynthesis, ethylene signal transduction pathway was observed in scion responses to grafting.ConclusionOur study is useful in understanding the molecular basis of grafting-induced flowering in grafted sweetpotatoes, and will lay a foundation for further research on sweetpotato breeding in the future.

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