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Transcriptomic changes during tuber dormancy release process revealed by RNA sequencing in potato.

Bailin Liu1, Ning Zhang2, Yikai Wen3

  • 1Gansu Key Laboratory of Crop Genetic and Germplasm Enhancement, Gansu Provincial Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou 730070, People's Republic of China; College of Agronomy, Gansu Agricultural University, Lanzhou 730070, People's Republic of China.

Journal of Biotechnology
|February 10, 2015
PubMed
Summary

Potato tuber dormancy release involves significant gene expression changes. Reserve mobilization and hormone metabolism are key, with distinct gene sets active before and after bud emergence for sprout outgrowth.

Keywords:
DormancyRNA-seqSproutingTranscriptomeTuber

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Genomics

Background:

  • Potato tuber dormancy release is crucial for plant propagation.
  • Understanding the molecular mechanisms governing this process is essential for agricultural applications.

Purpose of the Study:

  • To comprehensively analyze gene expression changes during potato tuber dormancy release.
  • To identify key genes and metabolic pathways involved in dormancy breaking and sprout outgrowth.

Main Methods:

  • RNA sequencing (RNA-Seq) was performed on potato tubers at three developmental stages: dormancy tuber (DT), dormancy release tuber (DRT), and sprouting tuber (ST).
  • Differential gene expression analysis was conducted between DT vs DRT and DRT vs ST.
  • Quantitative real-time PCR (qRT-PCR) was used to validate RNA-Seq findings.

Main Results:

  • Over 26,000 genes were analyzed, with thousands showing differential expression between stages.
  • Genes related to hormone metabolism (auxin, gibberellic acid, cytokinin, brassinosteroid) were upregulated during early dormancy release (DT vs DRT).
  • Genes involved in stress response, redox regulation, cell wall, and secondary metabolism were upregulated after dormancy release (DRT vs ST), facilitating sprout outgrowth.

Conclusions:

  • The study provides the first comprehensive transcriptomic landscape of potato tuber dormancy release.
  • Distinct sets of genes and metabolic pathways are activated sequentially to drive reserve mobilization, cell division, and sprout emergence.
  • Findings offer insights into the genetic regulation of potato dormancy and potential targets for improving cultivation.