論文

2020年9月

The inhibition of SlIAA9 mimics an increase in endogenous auxin and mediates changes in auxin and gibberellin signalling during parthenocarpic fruit development in tomato

Journal of plant physiology
  • Kim, Ji-Seong
  • ,
  • Ezura, Kentaro
  • ,
  • Lee, Jeongeun
  • ,
  • Kojima, Mikkiko
  • ,
  • Takebayashi, Yumiko
  • ,
  • Sakakibara, Hitoshi
  • ,
  • Ariizumi, Tohru
  • ,
  • Ezura, Hiroshi

252
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.jplph.2020.153238
出版者・発行元
ELSEVIER GMBH

Parthenocarpic fruit formation can be achieved through the inhibition of SlIAA9, a negative regulator of auxin signalling in tomato plant. During early fruit development under SlIAA9 inhibition, cell division and cell expansion were observed. Bioactive gibberellin (GA) accumulated, but indole-3-acetic acid (IAA) and trans-zeatin did not accumulate substantially. Furthermore, under SlIAA9 inhibition, auxin-responsive genes such as SlIAA2, -3, and -14 were upregulated, and SlARF7 was downregulated. These results indicate that SlIAA9 inhibition mimics an increase in auxin. The auxin biosynthesis genes SlTAR1, ToFZY, and ToFZY5 were stimulated by an increase in auxin and by auxin mimicking under SlIAA9 inhibition. However, SlTAR2 and ToFZY2 were upregulated only by pollination followed by high IAA accumulation. These results suggest that SlTAR2 and ToFZY2 play an important role in IAA synthesis in growing ovaries. GA synthesis was also activated by SlIAA9 inhibition through both the early-13-hydroxylation (for GA synthesis) and non-13-hydroxylation (GA) pathways, indicating that fruit set caused by SlIAA9 inhibition was partially mediated by the GA pathway. SlIAA9 inhibition induced th

リンク情報
DOI
https://doi.org/10.1016/j.jplph.2020.153238

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