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首页> 外文期刊>Nematology >Effect of the clover root-knot nematode (Meloidogyne trifoliophila) on growth of white clover
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Effect of the clover root-knot nematode (Meloidogyne trifoliophila) on growth of white clover

机译：三叶草根结线虫（Meloidogyne trifoliophila）对白三叶草生长的影响

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摘要

Root-infecting nematodes are common on white clover (Trifolium repens) in dairy pastures on the north coast of New South Wales and southeastern Queensland. Australia, where they are thought to contribute to poor growth and persistence. The nematode responsible for causing root-knot symptoms on white clover was identified as Meloidogyne trifoliophila. a species not previously recorded from Australia. M. trifoliophila failed to reproduce on any of the standard North Carolina hosts used to identify M. javanica. M. hapla, M. arenaria and M. incognita. but caused severe galling and exhibited a high rate of reproduction on white clover. PCR primers for these Meloidogyne species also failed to amplify DNA of M. trifoliophila. Identity was confirmed by morphological measurements and plant symptoms. In a glasshouse test, increasing initial nematode density within the range 0 to 10 000 per 500 ml pot led to reduced shoot and root growth, fewer nodules and more severe root-knot symptoms. A second pot test screened weed species as potential alternative hosts of M. trifoliophila. None of the eight grass species was galled but M. trifoliophila reproduced on two of the eight dicotyledon weeds, spear thistle (Cirsium vulgare) and pigweed (Portulaca oleraceae).
机译：根系感染线虫常见于新南威尔士州北海岸和昆士兰州东南部的奶牛场的白三叶草（白三叶）上。在澳大利亚，人们认为它们会助长不良的增长和持久性。造成白三叶草根结症状的线虫被鉴定为三倍体Meloidogyne trifoliophila。以前未从澳大利亚记录的物种。 Trifoliophila不能在用于鉴定爪哇M.javanica的任何标准北卡罗莱纳州寄主上繁殖。 M. hapla，M。arenaria和M. incognita。但造成严重的擦伤，并在白三叶草上表现出很高的繁殖率。这些类根结线虫物种的PCR引物也未能扩增三叶果蝇的DNA。通过形态学测量和植物症状来确认身份。在温室试验中，每500 ml锅中的初始线虫密度增加到0到10000之间，会导致芽和根生长减少，结节更少和更严重的根结症状。第二次盆栽试验筛选了杂草物种，将其作为Trifoliophila的潜在替代寄主。八个草种均未受苦，但在八种双子叶植物杂草，长矛蓟（Cirsium v​​ulgare）和杂草（Portulaca oleraceae）中的两个杂草上繁殖了三叶毛分支杆菌。

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