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Journal of Plant Growth Regulation

, Volume 38, Issue 1, pp 103–112 | Cite as

Over-expression of Peach PpIAA19 in Tomato Alters Plant Growth, Parthenocarpy, and Fruit Shape

  • Yifeng Ding
  • Wenfang Zeng
  • Xiaobei Wang
  • Yan Wang
  • Liang Niu
  • Lei Pan
  • Zhenhua Lu
  • Guochao Cui
  • Guohuai LiEmail author
  • Zhiqiang WangEmail author
Article
  • 203 Downloads

Abstract

The auxin/indole acetic acid (Aux/IAA) genes encode a large family of short-lived proteins that regulate auxin signaling in plants. Previous attempts to understand the role of auxin during fruit development in peach (Prunus persica) found that expression of the Aux/IAA gene PpIAA19 was upregulated during fruit ripening, but the biological significance of the PpIAA19 protein is still unknown. The current study detected PpIAA19 transcripts in all peach plant tissues but found higher levels of accumulation in fruit S1 and S4II stages. During fruit ripening, the expression level of the PpIAA19 gene in melting flesh (MF) peach fruit was unsurprisingly higher than in stony hard (SH) peach fruit. Tomato (Solanum lycopersicum cv. ‘Micro-Tom’) was used as a model for investigating the phenotypic and molecular changes associated with over-expression of PpIAA19. This revealed that PpIAA19 was involved in regulating tomato lateral root number, stem elongation, parthenocarpy, and fruit shape. Molecular analyses of transgenic tomato plants over-expressing PpIAA19 indicated that the observed phenotypic changes were partially mediated by regulating the expression of auxin response genes. This result extends the functional characterization of PpIAA19 in tomato, and broadens our understanding of the role of auxin signaling in regulating plant growth and development.

Keywords

Aux/IAA genes PpIAA19 Auxin Peach Tomato 

Notes

Acknowledgements

The research was financially supported by the National Natural Science Foundation of China (No. 31501732), the Agricultural Science and Technology Innovation Program (ASTIP) (CAAS-ASTIP-2018-ZFRI), and Central Public-interest Scientific Institution Basal Research Fund (1610192017103).

Author Contributions

WZ and ZW conceived the experiments; YD, XW, and YW collected plant materials and conducted the experiments; LN, LP, ZL, and GC performed phenotyping; YD and WZ analyzed the data; and WZ, GL, and ZW wrote the manuscript.

Compliance with Ethical Standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

344_2018_9813_MOESM1_ESM.docx (2.2 mb)
Supplementary material 1 (DOCX 2244 KB)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Zhengzhou Fruit Research InstituteChinese Academy of Agricultural SciencesZhengzhouPeople’s Republic of China
  2. 2.Key Laboratory of Horticultural Plant Biology, Ministry of EducationHuazhong Agricultural UniversityWuhanPeople’s Republic of China

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