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首页> 外文期刊>Journal of Experimental Botany >The effect of silicon on the infection by and spread of Pythium aphanidermatum in single roots of tomato and bitter gourd
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The effect of silicon on the infection by and spread of Pythium aphanidermatum in single roots of tomato and bitter gourd

机译：硅对番茄和苦瓜单根腐殖霉感染和传播的影响

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The effect of silicon (Si) supply on the infection and spread of Pythium aphanidermatum was studied in the roots of tomato [Lycopersicon esculentum (=Solanum lycopersicum), an Si excluder] and bitter gourd (Mormodica charantia, an Si intermediate accumulator). Individual roots were mounted into PVC compartmented boxes which allowed the application of Si and zoospores to defined root zones. Two days after inoculation, root growth was recorded, and P. aphanidermatum colonization of individual root sections was determined by ELISA. In tomato as well as in bitter gourd the root tip was the root section most sensitive to P. aphanidermatum infection. Application of Si did not affect severe root-growth inhibition by P. aphanidermatum in either species. However, continuous Si supply significantly inhibited the basipetal spread of the pathogen from the infected root apex in bitter gourd but not in tomato. Si application to the roots only during pretreatment or only during/after the infection of the roots failed to inhibit the spread of P. aphanidermatum. Determination and compartmentation of Si in the roots of bitter gourd revealed that apoplastic Si was not, but symplastic Si was, associated with the ability of the plant to reduce the spread of the fungus in roots. It is concluded that accumulation of Si in the root cell walls does not represent a physical barrier to the spread of P. aphanidermatum in bitter gourd and tomato roots. The maintenance of elevated symplastic Si contents is a prerequisite for Si-enhanced resistance against P. aphanidermatum.
机译：在番茄[Lycopersicon esculentum（= Solanum lycopersicum），一种Si排斥剂]和苦瓜（Mormodica charantia，一种硅中间蓄积物）的根中研究了硅供应对番石榴腐霉的感染和传播的影响。将单独的根固定在PVC分隔的盒子中，该盒子允许将Si和游动孢子施加到确定的根区域。接种两天后，记录根的生长，并通过ELISA确定单个根节的P. aphanidermatum定植。在番茄和苦瓜中，根尖是对P. aphanidermatum感染最敏感的根部。在这两种物种中，施用硅都不会影响P. aphanidermatum严重抑制根的生长。然而，连续的硅供应显着抑制了苦瓜中被感染根尖的病原体在基部的传播，但在番茄中却没有。仅在预处理期间或仅在根部感染期间/之后将Si施用于根部不能抑制P. aphanidermatum的扩散。苦瓜根中的硅含量测定和分隔表明，质朴硅不是，但共生硅与植物减少真菌在根中扩散的能力有关。结论是，硅在根细胞壁中的积累并不代表苦瓜和番茄根中P. aphanidermatum传播的物理障碍。维持高的共生Si含量是Si增强对菜粉红色小球菌抗性的先决条件。

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