植物ホルモンが関与する植物生長制御機構と免疫学的生長調節に関する研究(学会賞)
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Control of plant growth depends on the comprehensive understanding of phytohormone function and establishment of technologies to regulate the function. Here I report two basic studies and one application-oriented study. Pharbitis 'uzukobito' is arecessive mutant showing extremely dwarfphenotype. Exogenous application ofbrassinosteroidbiosynthetic intermediates and analysis of endogenous brassinosteroids suggested a defect of PnDET2, a homologous enzyme of arabidopsis DET2. The cloning and function assay demonstrated the mutation and the functional loss of the enzyme of uzukobito. AGPs constitue a family of glycoproteins. The specific binder of AGPs (Yariv) showed the involvement of AGPs in GA function in barley aleurone cells. Microarray analysis showed that Yariv is an overall represser of GA-responsive gene expression, and the reagent also activated defense-related signaling. Well-established defense system inducers such as jasmonic acid and chitin elicitor also inhibited GA-inducible events in aleurone cells, indicating that GA signaling is under the regulation of defense-related signaling. Immunomodulation is a mean to modulate organism function by antibody production to capture either endogenous or exogenous antigens. I applied this method to plants. Production of single-chain antibodies both against bioactive GAs and against their biosynthetic precursors gave clear dwarf phenotype, by repressing GA action and GA biosynthesis, respectively.
- 植物化学調節学会の論文
- 2007-10-05
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