Identification of Plant Factors Inducing Virulence Gene Expression in Agrobacterium tumefaciens.
作者:Yan-Nong SONG、Masaaki SHIBUYA、Yutaka EBIZUKA、Ushio SANKAWA
DOI:10.1248/cpb.39.2347
日期:——
In the natural gene-transfer system of Agrobacterium tumefaciens, the expression of virulence (vir) gene of Ti (tumor inducing) plasmid is essential for the subsequent transferred deoxyribonucleic acid (T-DNA) transfer from bacterium to plant cells. vir gene expression is induced by signal compounds from pants such as acetosyringone and α-hydroxyacetosyringone which were isolated from hairy root cultures of Nicotiana tabacum. In a search for intrinsic signal compounds in plants, acetosyringone and α-hydroxyacetosyringone were identified as the vir-inducing compounds of the hairy root cultures of Atropa belladonna. The signal compounds of seedlings of Pisum sativum were identified as sinapyl and coniferyl alcohols. The quantities of these vir-inducing compounds were significantly increased when plant tissues were wounded, though the degree of increase was markedly different in each plant.
在农杆菌(Agrobaacterium tumefaciens)的天然基因转移系统中,Ti(肿瘤诱导)质粒的毒力(vir)基因的表达对于随后的脱氧核糖核酸(T-DNA)从细菌转移到植物细胞至关重要。vir 基因的表达受到来自裤子的信号化合物的诱导,如从烟草(Nicotiana tabacum)毛状根培养物中分离出的乙酰丁香酮(acetosyringone)和α-羟基乙酰丁香酮(α-hydroxyacetosyringone)。在寻找植物内在信号化合物的过程中,发现乙酰丁香酮和α-羟基乙酰丁香酮是颠茄毛根培养物中的病毒诱导化合物。经鉴定,野豌豆幼苗的信号化合物为山奈醇和针叶醇。当植物组织受伤时,这些病毒诱导化合物的数量明显增加,但每种植物的增加程度明显不同。