論文

2015年7月

Ethylene suppresses tomato (Solanum lycopersicum) fruit set through modification of gibberellin metabolism

PLANT JOURNAL
  • Yoshihito Shinozaki
  • ,
  • Shuhei Hao
  • ,
  • Mikiko Kojima
  • ,
  • Hitoshi Sakakibara
  • ,
  • Yuko Ozeki-Iida
  • ,
  • Yi Zheng
  • ,
  • Zhangjun Fei
  • ,
  • Silin Zhong
  • ,
  • James J. Giovannoni
  • ,
  • Jocelyn K. C. Rose
  • ,
  • Yoshihiro Okabe
  • ,
  • Yumi Heta
  • ,
  • Hiroshi Ezura
  • ,
  • Tohru Ariizumi

83
2
開始ページ
237
終了ページ
251
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1111/tpj.12882
出版者・発行元
WILEY-BLACKWELL

Fruit set in angiosperms marks the transition from flowering to fruit production and a commitment to seed dispersal. Studies with Solanum lycopersicum (tomato) fruit have shown that pollination and subsequent fertilization induce the biosynthesis of several hormones, including auxin and gibberellins (GAs), which stimulate fruit set. Circumstantial evidence suggests that the gaseous hormone ethylene may also influence fruit set, but this has yet to be substantiated with molecular or mechanistic data. Here, we examined fruit set at the biochemical and genetic levels, using hormone and inhibitor treatments, and mutants that affect auxin or ethylene signaling. The expression of system-1 ethylene biosynthetic genes and the production of ethylene decreased during pollination-dependent fruit set in wild-type tomato and during pollination-independent fruit set in the auxin hypersensitive mutant iaa9-3. Blocking ethylene perception in emasculated flowers, using either the ethylene-insensitive Sletr1-1 mutation or 1-methylcyclopropene (1-MCP), resulted in elongated parthenocarpic fruit and increased cell expansion, whereas simultaneous treatment with the GA biosynthesis inhibitor paclobutrazol (PAC) inhibited parthenocarpy. Additionally, the application of the ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC) to pollinated ovaries reduced fruit set. Furthermore, Sletr1-1 parthenocarpic fruits did not exhibit increased auxin accumulation, but rather had elevated levels of bioactive GAs, most likely reflecting an increase in transcripts encoding the GA-biosynthetic enzyme SlGA20ox3, as well as a reduction in the levels of transcripts encoding the GA-inactivating enzymes SlGA2ox4 and SlGA2ox5. Taken together, our results suggest that ethylene plays a role in tomato fruit set by suppressing GA metabolism.

Web of Science ® 被引用回数 : 53

リンク情報
DOI
https://doi.org/10.1111/tpj.12882
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000357617200004&DestApp=WOS_CPL

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