Autophagy plays a role in chloroplast degradation during senescence in individually darkened leaves

Shinya Wada, Hiroyuki Ishida, Masanori Izumi, Kohki Yoshimoto, Yoshinori Ohsumi, Tadahiko Mae, Amane Makino

研究成果: Article査読

230 被引用数 (Scopus)

抄録

Chloroplasts contain approximately 80% of total leaf nitrogen and represent a major source of recycled nitrogen during leaf senescence. While bulk degradation of the cytosol and organelles in plants is mediated by autophagy, its role in chloroplast catabolism is largely unknown. We investigated the effects of autophagy disruption on the number and size of chloroplasts during senescence. When leaves were individually darkened, senescence was promoted similarly in both wild-type Arabidopsis (Arabidopsis thaliana) and in an autophagy-defective mutant, atg4a4b-1. The number and size of chloroplasts decreased in darkened leaves of wild type, while the number remained constant and the size decrease was suppressed in atg4a4b-1. When leaves of transgenic plants expressing stroma-targeted DsRed were individually darkened, a large accumulation of fluorescence in the vacuolar lumen was observed. Chloroplasts exhibiting chlorophyll fluorescence, as well as Rubisco-containing bodies, were also observed in the vacuole. No accumulation of stroma-targeted DsRed, chloroplasts, or Rubisco-containing bodies was observed in the vacuoles of the autophagy-defective mutant. We have succeeded in demonstrating chloroplast autophagy in living cells and provide direct evidence of chloroplast transportation into the vacuole.

本文言語English
ページ(範囲)885-893
ページ数9
ジャーナルPlant physiology
149
2
DOI
出版ステータスPublished - 2009 2

ASJC Scopus subject areas

  • 生理学
  • 遺伝学
  • 植物科学

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