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KMID : 0368420090520020079
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Journal of Plant Biology
2009 Volume.52 No. 2 p.79 ~ p.79
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Role of an Arabidopsis Rab GTPase RabG3b in Pathogen Response and Leaf Senescence
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Kwon Soon-Il
Cho Hong-Joo
Bae Ki-Suk
Jung Jin-Hee
Jin Hak-Chul
Park Ohk-Mae K.
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Abstract
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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 wild-type and RabG3bDN plants was observed. In addition, RabG3bOX and RabG3bCA plants underwent accelerated leaf senescence compared to wild-type and RabG3bDN plants. These results suggest that RabG3b is a modulator for cell death progression during pathogen response and senescence process in plants.
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KEYWORD
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Rab GTPase, Programmed cell death, Hypersensitive response, Leaf senescence, Fumonisin B1, Alternaria brassicicola
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