Oxalic acid, cell wall-degrading enzymes and pH in pathogenesis and their significance in the virulence of two Sclerotinia sclerotiorum isolates on sunflower
Oxalic acid, cell wall-degrading enzymes and pH in pathogenesis and their significance in the virulence of two Sclerotinia sclerotiorum isolates on sunflower
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DOI：
10.1016/s0048-4059(83)81021-2
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发表时间：
1983-05
期刊：
影响因子：
--
通讯作者：
P. Marcianò;P. Lenna;P. Magro
中科院分区：
文献类型：
--
作者：
P. Marcianò;P. Lenna;P. Magro
菌株B24(强毒力)和SS41(弱毒力)均能在受侵染的向日葵茎中产生多聚半乳糖醛酸酶、纤维素酶和木聚糖酶。这些酶，即使在它们选择的时候是活跃的。在接种SS41的组织的pH值为6的情况下，PHS受到严重抑制。与这些组织相比，接种B24的组织草酸含量较高，多酚氧化酶(PPO)活性较低，pH(4)较低。草酸对PPO活性有抑制作用，在pH为4时抑制作用最强。讨论了这些因素在核盘菌毒力中的可能意义。
Isolates B24 (strongly virulent) and SS41 (weakly virulent) both produced polygalacturonase, cellulase and xylanase in infected sunflower stems. These enzymes, even though active at their opt. pHs, were severely inhibited at pH 6, which was the pH of the SS41-inoculated tissues. Compared with these tissues, B24-inoculated tissues were characterized by a greater amount of oxalic acid, a lack of polyphenoloxidase (PPO) activity and a lower pH (4). Oxalic acid proved to be an inhibitor of PPO activity and its effect was particularly strong at pH 4. The possible significance of these factors in the virulence of the S. sclerotiorum isolates is discussed.