J Integr Plant Biol. ›› 1996, Vol. 38 ›› Issue (11): -.

• Research Articles •    

The Role of Cytokinin Biosynthetic Gene in Regulating the Expression of a Class of Pathogenesis-Related Protein Genes in Tobacco Plants

Ma Qing-hu, Song Yan-ru and Sun Jing-san   

Abstract: The expression characteristics of a class of pathogenesis-related protein (PR) genes, namely basic chitinase, β-1, 3-glucanase, osmotin and extensin, were studied in tobacco (Nicotiana tabacum cv. Wisconsin 38) plants. RNA blot hybridization showed that these four genes were regulated in a developmental and organ-specific manner in tobacco. In the transgenic fascicular shoots which contained the active cytokinin biosynthetic gene (ipt gene) from Agrobacterium tumefaciens, the expressions of these four genes were co-regulated by overproduction of endogenous cytokinins and vector effect. Cytokinins reduced the expressions while vector effect induced the expressions of these four genes. Heat shock also de creased the steady-state levels of the four RNAs. These data suggest a complex regulation of PR genes.

Key words: Cytokinin biosynthetic gene, Vector effect, Pathogenesis-related protein genes

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