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首页> 外文会议>International citrus congress >Quantification of Xanthomonas axonopodis pv. citri Populations in Citrus Groves
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Quantification of Xanthomonas axonopodis pv. citri Populations in Citrus Groves

机译：Xanthomonas Axonopodis PV的定量。柑橘树丛中的Citri人群

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Population size, persistence, survival, and dispersal of Xanthomonas axonopodis pv. citri (Xac), the causal agent of citrus canker, are important factors in canker management in endemic regions. We quantified Xac populations on leaves and fruits of grapefruit (Citrus paradisi) , orange (C. sinensis) , and lemon (C. limon) trees, in rain water, in dew, and on weeds at different distances from cankerinfected citrus trees in Argentina. Viable bacterial cells were detected by infiltrating the sample liquid suspension in the mesophyll of Duncan grapefruit and Key lime (C. aurantifolia) seedlings kept in a growth room and the number of Xac was estimated by calibration with the number of canker lesions per square centimeter in an infectivity titration assay. Sampling was made during four consecutive growing seasons, from 2004 to 2008. Results indicated that high concentration of Xac (105 - 107) was recovered by external washing of 100% of diseased fruits whereas 36% of symptomless fruits carried Xac at 10 106 per fruit. Rain collected from diseased and symptomless leaves from an infected grove 100% of the diseased ones carried populations from 102 -105 whereas 55% -87% of symptomless ones had 10 - 10 Xac cells per leaf. Dew collected from similar leaves and fruits had Xac in 100% of them when they were diseased (10 - 104)and 77% of the symptomless ones had 10 - 104 cells per ml. Weeds (mainly grass) were collected under the canopy and at 1, 5, 10, and 20 meters from diseased trees; samples positive for Xac decreased rapidly with distance from the infected grove. Positive samples were from 10 - 10 per gram of tissue. Dew, even when containing high Xac populations, apparently did not serve as a major inoculum source. Populations of Xac decreased sharply with increasing distances from the diseased trees even after rainstorms.
机译：Xanthomonas Axonopodis PV的人口大小，持续性，存活和分散。 Citri（XAC）是柑橘溃疡的因果因子，是人流行区域溃疡管理中的重要因素。我们在葡萄柚（柑橘Paradisi），橘子（C. sinensis）和柠檬（C. limon）树上的叶片和水果上量化XAC群体，在雨水中，露水，以及在阿根廷的不同距离的不同距离中的露水中。通过浸润在牙腔葡萄柚和叶片（C. aurantifolia）在生长室内的果树（C. aurantifolia）幼苗中浸润的样品液体悬浮液来检测活细菌细胞，并通过校准每平方厘米的溃疡病变的数量估算XAC的数量感染性滴定测定。在2004年至2008年的四个连续生长季节中进行了取样。结果表明，通过100％的患病水果的外部洗涤恢复了高浓度的XAC（105-107），而36％的症状水果每种水果10106次患有XAC 。从受感染的树丛中从患病和症状叶子收集的雨量从102-105的患病患者患有群体，而55％-87％的症状无症状有10-10个XAC细胞。当患有类似的叶子和水果中的露水在患有患者（10 - 104）和77％的症状物质中有10％ - 每mL细胞的XAC。杂草（主要是草）在树冠下收集，距离患病树1,5,10和20米; XAC阳性的样品随着感染树丛的距离而迅速下降。阳性样品为每克/克组织10-10。露水，即使在含有高XAC种群时，显然都不用作主要的接种源。 XAC的群体甚至在暴雨之后患有患病树的距离越来越大幅下降。

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