Chemotaxis plays an important role in food-finding, mate-finding, response to host plants and other aspects of nematode interactions. In this study, chemotaxis responses of Meloidogyne incognita second-stage juveniles (J2) to seven plant hosts were investigated. Chemotaxis volatiles from root exudates were analyzed by gas chromatography-mass spectrometry, from which four attractive compounds were identified as the tridecane, 1-docosene, 1-octadecene and 2-hexyl-1-decanol. 1-docosene was distributed in root exudates of all seven plants, while the other compounds were found only in some root exudates. In addition, organic acids commonly found in plant root exudates were screened. Among the 16 types of organic acids, six organic acids could attract J2 of M. incognita. Malic acid, oxalic acid and lactic acid were found to demonstrate chemotactic effect on M. incognita J2 and were distributed differently in the seven plants. These results indicate that volatiles and organic acids secreted from different plants possess the ability to attract the J2 of M. incognita. This study provides insight into the signaling mechanism between root-knot nematodes and host plants, which may thus help develop more effective biological control methods.

趋化性在寻找食物，寻找伴侣，对寄主植物的反应以及线虫相互作用的其他方面起着重要作用。在这项研究中，调查了南方根结线虫第二阶段幼虫（J2）对七种植物宿主的趋化性响应。通过气相色谱-质谱法分析了根分泌液的趋化性挥发物，从中鉴定出四个有吸引力的化合物：十三烷，1-二十二烯，1-十八烯和2-己基-1-癸醇。1-二十碳烯分布在所有七种植物的根系分泌物中，而其他化合物仅存在于某些根系分泌物中。此外，还筛选了植物根系分泌物中常见的有机酸。在这16种有机酸中，有6种有机酸可以吸引隐孢子虫的J2 。。发现苹果酸，草酸和乳酸对M具有趋化作用。锯齿J2，在七种植物中的分布不同。这些结果表明，不同植物分泌的挥发物和有机酸具有吸引隐孢菌J2的能力。这项研究提供了对根结线虫和寄主植物之间信号传导机制的深入了解，从而可能有助于开发更有效的生物学控制方法。