Role of an Arabidopsis rab GTPase RabG3b in pathogen response and leaf senescence

Soon Il Kwon, Hong Joo Cho, Kisuk Bae, Jin Hee Jung, Hak Chul Jin, Ohkmae Kim

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22 Citations (Scopus)

Abstract

In our previous proteomic analysis, we isolated a small GTPase RabG3b as a salicylic acid-responsive protein in Arabidopsis (Oh et al. in Plant Cell 17:2832-2847, 2005). Here, we constructed transgenic plants overexpressing wild-type (RabG3bOX), constitutively active (RabG3bCA), and dominant negative (RabG3bDN) forms of RabG3b for functional studies. The phenotypes of these transgenic plants were indistinguishable from wild-type plants under normal growth conditions. However, both RabG3bOX and RabG3bCA plants displayed unrestricted hypersensitive programmed cell death against a fungal toxin Fumonisin B1 and a fungal pathogen Alternaria brassicicola, whereas no major difference between wildtype and RabG3bDN plants was observed. In addition, RabG3bOX and RabG3bCA plants underwent accelerated leaf senescence compared to wild-type and RabG3bDNplants. These results suggest that RabG3b is a modulator for cell death progression during pathogen response and senescence process in plants.

Original languageEnglish
Pages (from-to)79-87
Number of pages9
JournalJournal of Plant Biology
Volume52
Issue number2
DOIs
Publication statusPublished - 2009 Apr 1

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Keywords

  • Alternaria brassicicola
  • Fumonisin B1
  • Hypersensitive response
  • Leaf senescence
  • Programmed cell death
  • Rab GTPase

ASJC Scopus subject areas

  • Plant Science

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