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KMID : 0368420080510050341
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Journal of Plant Biology
2008 Volume.51 No. 5 p.341 ~ p.346
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A role of hexokinases in plant resistance to oxidative stress and pathogen infection
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Sarowar Sujon
Lee Jae-Yong
Ahn Eu-Ree
Pai Hyun-Sook
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Abstract
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Previously, we reported that mitochondria-associated hexokinases are active in controlling programmed cell death in plants (Plant Cell 18, 2341-2355). Here, we investigated their role under abiotic- and biotic-stress conditions. Expression ofNbHxk1, aNicotiana benthamiana hexokinase gene, was stimulated by treatment with salicylic acid or methyl viologen (MV), and was also up-regulated by pathogen infection. In response to MV-induced oxidative stress, NbHxk1-silenced plants exhibited increased susceptibility, while the HXK1? and HXK2-overexpressingArabidopsis plants had enhanced tolerance. Moreover, those overexpressing plants showed greater resistance to the necrotrophic fungal pathogenAlternaria brassicicola. HXK-over-expression also mildly protected plants against the bacterial pathogenPseudomonas syringae pv.tomato DC3000, a response that was accompanied by increased H2O2 production and elevatedPR1 gene expression. These results demonstrate that higher levels of hexokinase confer improved resistance to MV-induced oxidative stress and pathogen infection.
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KEYWORD
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ion leakage, fungus infection, hexokinase overexpression, methyl viologen, virus-induced gene silencing
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