Metabolism of the crucifer phytoalexins wasalexin A and B in the plant pathogenic fungus Leptosphaeria maculans
作者:M. Soledade C. Pedras、Mojm?r Such?
DOI:10.1039/b609367a
日期:——
Wasalexins A and B are crucifer phytoalexins produced by two substantially different plant species, a wild species abundant in the Canadian prairies and a condiment plant widely cultivated in Japan. Interestingly, both plant species are resistant to an economically important fungal plant pathogen, the blackleg fungus [Leptosphaeria maculans (Desm.) Ces. et de Not., asexual stage Phoma lingam (Tode
Wasalexins A和B是十字花科植物抗毒素,由两种基本不同的植物物种产生,加拿大的大草原上盛产一种野生物种,而日本则广泛种植一种调味品植物。有趣的是,两种植物都对经济上重要的真菌植物病原体黑腿真菌[Leptosphaeria maculans(Desm。)Ces。等,无性,Phoma lingam(Tode ex Fr.)Desm。]。研究了黄腐乳杆菌,对菜籽油有高毒力的菌株(BJ 125)和对芥末有毒力的较不常见的菌株(Laird 2 / Mayfair 2)中芥菜毒素A和B的转化。已经确定,两种真菌分离物均能够通过在异蜡毒素A的情况下还原或通过水解然后在异蜡毒素B的情况下还原而有效地代谢和分解毒素,从而有效地代谢和解毒。并非自然发生的,还发现其在黄斑狼疮的培养物中减少了。使用光谱方法阐明了新的代谢产物的结构,并通过合成进行了确认。生物测定法表明,芥子毒素的生物转化是一种解毒过程,