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 language | English |
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Pages (from-to) | 79-87 |
Number of pages | 9 |
Journal | Journal of Plant Biology |
Volume | 52 |
Issue number | 2 |
DOIs | |
Publication status | Published - 2009 Apr |
Keywords
- Alternaria brassicicola
- Fumonisin B1
- Hypersensitive response
- Leaf senescence
- Programmed cell death
- Rab GTPase
ASJC Scopus subject areas
- Plant Science