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首页> 外文期刊>Plant Disease >Natural Infection of Southern Highbush Blueberry (Vaccinium corymbosum Interspecific Hybrids) by Xylella fastidiosa subsp. fastidiosa
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Natural Infection of Southern Highbush Blueberry (Vaccinium corymbosum Interspecific Hybrids) by Xylella fastidiosa subsp. fastidiosa

机译：南瓜Fastidiosa子公司的南方高骨蓝莓（瓦西吡吡吡吡吡咯的杂交种）的自然感染。 fastidiosa.

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Xylella fastidiosa (Xf) is an emerging insect-vectored, xylem-limited bacterium that can cause disease on several economically important fruit and tree crops including almond, blueberry, citrus, grapevine, peach, and pecan. On blueberry, Xf causes bacterial leaf scorch (BLS), which is prevalent in the southeastern United States. This disease, previously reported to be caused by Xfsubsp. multiplex (Xfin), can result in rapid plant decline and death of southern highbush (SHB) blueberry cultivars. In 2017, a survey of blueberry plantings in southern Georgia (U.S.A.) confirmed the presence of Xf-infected plants in eight of nine sites examined, and seven isolates were cultured from infected plants. Genetic characterization of these isolates through single-locus and multilocus sequence analysis revealed that three isolates from two sites belonged to Xfsubsp. fastidiosa (Xff), with significant similarity to isolates from grapevine. After these three isolates were artificially inoculated onto greenhouse-grown SHB blueberries (cv. 'Rebel'), symptoms typical of BLS developed, and Xff infection was confirmed through genetic characterization and reisolation of the bacterium to fulfill Koch's postulates. Because all previously reported Xf isolates from blueberry have been characterized as Xfm, this is the first time that isolation of Xff has been reported from naturally infected blueberry plantings. The potential impact of Xff isolates on disease management in blueberry requires further exploration. Furthermore, given that isolates from both Xfin and Xff were obtained within a single naturally infected blueberry planting, blueberry in southern Georgia may provide opportunities for intersubspecific recombination between Xff and Xfm isolates.
机译：Xylella Fastidiosa（XF）是一种新兴昆虫，Xylem限量细菌，可导致几种经济上重要的水果和树木作物，包括杏仁，蓝莓，柑橘，葡萄，桃和山核桃。在蓝莓，XF导致细菌叶片（BLS），在美国东南部普遍存在。这种疾病，以前据报道是由Xfsubsp引起的。多路复用（XFIN），可导致南部高骨（SHB）蓝莓品种的植物衰退和死亡。 2017年，在格鲁吉亚南部（U.A.）的蓝莓种植调查证实了XF感染植物的存在，在九个位点中占九个遗址，并从感染的植物培养了七个分离物。通过单轨和多层序列分析的这些分离物的遗传表征显示，来自两个位点的三个分离物属于XFsubsp。 Fastidiosa（XFF），具有与葡萄葡萄的分离物具有重要相似之处。将这三个分离物人工地接种到温室生长的SHB蓝莓（CV。'反叛'）中，通过遗传表征和细菌的遗传表征和再坐标来证实BLS的典型症状和XFF感染，以实现Koch的假设。因为先前报告的蓝莓的XF分离株已经表征为XFM，这是第一次从自然感染的蓝莓种植中报告了XFF的第二次。 XFF分离株对蓝莓疾病管理的潜在影响需要进一步探索。此外，鉴于XFIN和XFF的分离物在一个天然感染的蓝莓种植中获得，Glowbers在南部的蓝莓可以为XFF和XFM分离株之间的梭菌性重组提供机会。

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