Phytopathology. 2006 Mar;96(3):313-9. doi: 10.1094/PHYTO-96-0313.
ABSTRACT Pseudomonas savastanoi pv. savastanoi causes olive knot disease, which is present in most countries where olive trees are grown. Although the use of cultivars with low susceptibility may be one of the most appropriate methods of disease control, little information is available from inoculation assays, and cultivar susceptibility assessments have been limited to few cultivars. We have evaluated the effects of pathogen virulence, plant age, the dose/response relationship, and the induction of secondary tumors in olive inoculation assays. Most P. savastanoi pv. savastanoi strains evaluated were highly virulent to olive plants, but interactions between cultivars and strains were found. The severity of the disease in a given cultivar was strongly dependent of the pathogen dose applied at the wound sites. Secondary tumors developed in noninoculated wounds following inoculation at another position on the stem, suggesting the migration of the pathogen within olive plants. Proportion and weight of primary knots and the presence of secondary knots were evaluated in 29 olive cultivars inoculated with two pathogen strains at two inoculum doses, allowing us to rate most of the cultivars as having either high, medium, or low susceptibility to olive knot disease. None of the cultivars were immune to the disease.
摘要 野油菜黄单胞菌 pv. savastanoi 引起橄榄节瘤病，该病存在于大多数种植橄榄的国家。尽管使用低感病品种可能是控制疾病的最适当方法之一，但接种试验提供的信息很少，对品种的敏感性评估也仅限于少数几个品种。我们评估了病原体毒力、植物年龄、剂量反应关系和橄榄接种试验中继发肿瘤的诱导作用。评估的大多数野油菜黄单胞菌 pv. savastanoi 菌株对橄榄植物具有高度致病性，但发现了品种和菌株之间的相互作用。在特定品种中，疾病的严重程度强烈依赖于在伤口部位施加的病原体剂量。在茎的另一位置接种后，在未接种的伤口处会形成次生肿瘤，这表明病原体在橄榄植物内迁移。用两种病原体菌株在两种接种剂量下接种 29 个橄榄品种，评估了主要结瘤的比例和重量以及次生结瘤的存在，这使我们能够对大多数品种的橄榄结瘤病的高、中、低易感性进行评级。没有一个品种对该疾病具有免疫力。
