HPY2 gene expression analysis and the role of auxin in early fruit development in tomato

H. Nariyama, Y. Sugiyama, T. Shibuya, K. Hayashi, Y. Kanayama

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


Fruit size depends on cell division and cell expansion, and fruit development comprises cell division and cell expansion periods. Here we focused on the regulatory mechanism of the cell division as a determining factor for fruit size in tomato as the model plant of fruit crops. In Arabidopsis roots, auxin-induced HIGH PLOIDY 2 (HPY2) reportedly regulates cell division. In this study, we performed auxin and anti-auxin treatments, and the expression of the tomato HPY2 homolog SlHPY2 was analyzed to reveal the effect of auxin on cell division in tomato fruit. SlHPY2 mRNA levels were higher at the cell division stage. The number of cells increased and decreased by auxin and anti-auxin, respectively, and the SlHPY2 mRNA levels increased by auxin. Auxin also increased the mRNA levels of tomato cyclin-dependent kinase. The results suggest that cell division during early fruit development is promoted by SlHPY2 gene expression enhanced by auxin. Interestingly, the expression of the tomato CCS52A homolog SlCCS52A as an index of endoreduplication increased by auxin, suggesting that the role of auxin in endoreduplication could be different between tomato fruit and Arabidopsis roots.

Original languageEnglish
Title of host publication13th International Symposium on Plant Bioregulators in Fruit Production
EditorsS. Kondo
PublisherInternational Society for Horticultural Science
Number of pages6
ISBN (Print)9789462612013
Publication statusPublished - 2018 Jun 30
Externally publishedYes

Publication series

NameActa Horticulturae
ISSN (Print)0567-7572
ISSN (Electronic)2406-6168


  • 1-naphthylacetic acid
  • Anti-auxin
  • Cell division
  • SlHPY2
  • Tomato fruit

ASJC Scopus subject areas

  • Horticulture


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