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首页> 外文期刊>Journal of Experimental Botany >Leaf scorch symptoms are not correlated with bacterial populations during Pierce's disease
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Leaf scorch symptoms are not correlated with bacterial populations during Pierce's disease

机译：皮尔斯氏病期间叶片焦烧症状与细菌数量无关

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摘要

Xylella fastidiosa (Xf) is a xylem-limited bacterium that lives as a harmless endophyte in most plant species but is pathogenic in several agriculturally important crops such as coffee, citrus, and grapevine (Vitis vinifera L.). In susceptible cultivars of grapevine, Xf infection results in leaf scorch, premature leaf senescence, and eventually vine death; a suite of symptoms collectively referred to as Pierce's disease. A qPCR assay was developed to determine bacterial concentrations in planta and these concentrations were related to the development of leaf-scorch symptoms. The concentration of Xf in leaves of experimental grapevines grown in the greenhouse was similar to the concentration of Xf in leaves of naturally infected plants in the field. The distribution of Xf was patchy within and among leaves. Some whole leaves exhibited severe leaf-scorch symptoms in the absence of high concentrations of Xf. Despite a highly sensitive assay and a range of Xf concentrations from 102 to 109 cells g−1 fresh weight, no clear relationship between bacterial population and symptom development during Pierce's disease was revealed. Thus, high and localized concentrations of Xf are not necessary for the formation of leaf-scorch symptoms. The results are interpreted as being consistent with an atiology that involves a systemic plant response.
机译：fastylosa（Xf）是一种木质部有限的细菌，在大多数植物中都作为无害内生菌生活，但在几种重要的农作物，例如咖啡，柑橘和葡萄中也具有致病性（葡萄）。在易感的葡萄品种中，Xf感染导致叶片焦烧，叶片过早衰老并最终导致藤本植物死亡。一系列症状统称为皮尔斯氏病。开发了qPCR测定法来确定植物中的细菌浓度，这些浓度与叶焦症状的发展有关。在温室中生长的实验性葡萄树叶片中的Xf浓度与田间自然感染植物叶片中的Xf浓度相似。 Xf在叶片内和叶片间的分布不规则。在没有高浓度Xf的情况下，一些整片叶子表现出严重的焦烧症状。尽管进行了高度灵敏的测定，Xf浓度范围从10 2 到10 9 细胞g -1 新鲜体重，但细菌之间没有明确的关系揭示了皮尔斯病期间的数量和症状发展。因此，高浓度和局部浓度的Xf对于形成叶子焦烧症状不是必需的。结果被解释为与涉及系统性植物反应的病因一致。

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