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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
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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 of NbHxk1, a Nicotiana 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-overexpressing Arabidopsis plants had enhanced tolerance. Moreover, those overexpressing plants showed greater resistance to the necrotrophic fungal pathogen Alternaria brassicicola. HXK-over-expression also mildly protected plants against the bacterial pathogen Pseudomonas syringae pv. tomato DC3000, a response that was accompanied by increased $H_2O_2$ production and elevated PR1 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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