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RISS 인기검색어
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- 저자 : Ben Ke Kuai (검색결과 3 건)
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Jin Yu,Xiao-Yan Wang,Qiang Wei,Ben-Ke Kuai 한국식물학회 2010 Journal of Plant Biology Vol.52 No.4
Probenazole (PBZ) is a highly effective chemical inducer of systemic acquired resistance (SAR). We found that the transcript level of NPR1, a key regulator of SAR,was significantly up-regulated upon PBZ treatment in Arabidopsis. To identify cis-elements involved in this response, a series of 5′ deleted fragments in the upstream region of NPR1 were fused to the GUS gene, and the resultant constructs were then introduced into tobacco plants. We have shown that even the shortest of these fragments was able to drive the expression of GUS at a similar level to that of the largest fragment after PBZ treatment. Further mutation analysis within the fragment showed only when both of the two W-boxes present at -128and -123 were mutated could the responsiveness to PBZ treatment be completely abolished. These results suggest that these two W-boxes are necessary for the full responsiveness of AtNPR1 to PBZ treatment in tobacco plants. This requirement implies that one or more of WRKY transcription factors may play a key role in the positive regulation of PBZ-induced SAR, mediated by AtNPR1. Moreover, the characteristic cross-species responsiveness of the AtNPR1 upstream region to PBZ treatment demonstrates that a conserved regulatory mechanism of PBZinduced SAR may exist in diverse plant species.
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Hui-Fang Zhao,Kai Qiu,Guo-Dong Ren,Yong Zhu,Ben-Ke Kuai 한국식물학회 2010 Journal of Plant Biology Vol.53 No.1
A developmentally stunted mutant (dsm1) of Arabidopsis, isolated from an EMS mutant screen, had a pleiotropic phenotype, including repressed germination,retarded growth, delayed flowering, and impaired fertility. Additionally, dsm1 had a lifespan of approximately 160 days, which was more than twice the lifespan of the wild type (Col-0). Fine morphological and anatomical characters, such as the shoot apical meristem, root apical meristem, seed shape, and seed surface, were obviously altered in dsm1. We found that both abscisic acid and zeatin riboside levels were significantly greater in dsm1 than in Col-0 at all stages of development, while the levels of indole-3-acetic acid and gibberellins varied by age. The expressions of some abscisic acid-related genes were higher in dsm1 than in Col-0. These data indicate that DSM1 may play a general role in plant growth and development.
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The Pathway and Regulation of Salicylic Acid Biosynthesis in Probenazole-Treated Arabidopsis
Jin Yu,Jiong Gao,Xiao Yan Wang,Qiang Wei,Li Feng Yang,Kai Qiu,Ben Ke Kuai 한국식물학회 2010 Journal of Plant Biology Vol.53 No.6
Probenazole (PBZ; 3-allyloxy-1,2-benzisothiazole-1,1-dioxide) is a highly effective chemical inducer of systemic-acquired resistance (SAR). It has been used widely to protect rice plants against the rice blast fungus Magnaporthe grisea. Previous studies have shown that PBZ induces SAR through enhanced accumulation of salicylic acid (SA). Plants synthesize SA by either a pathway that uses phenylalanine as substrate or another that involves isochorismate. To clarify how SA is produced in PBZ-treated Arabidopsis, we examined the expression patterns and enzyme activities of phenylalanine ammonia lyase (PAL) and isochorismate synthase (ICS), which are the main components of the phenylalanine and isochorismate pathways, respectively. PBZ exposure significantly improved the accumulation of SA and increased ICS activity. In the sid2–2 mutant, which has a defect in ICS1,PBZ had no effect on the level of endogenous SA or activity of ICS. In contrast, PAL activity and the expression of most PAL genes were down-regulated by such treatment in wild-type plants. These results suggest that SA is mainly synthesized via the ICS-mediated pathway in Arabidopsis.
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