Tan Matthew, Cobon Jennifer, Aitken Elizabeth, Cook Lyn G
School of Biological Sciences, The University of Queensland, Brisbane, QLD, 4072, Australia.
Syst Parasitol. 2010 Nov;77(3):175-83. doi: 10.1007/s11230-010-9265-8. Epub 2010 Oct 20.
Radopholus similis is one of the world's ten most economically important plant-parasitic nematodes. It is especially a problem in banana cultivation, where the nematodes' feeding reduces yields and causes toppling disease. It has been suggested that the genus Radopholus Thorne, 1949 might have an Australian origin, but the native range of R. similis (Cobb, 1893) is not well known. Here we undertake a phylogeographical study of samples of R. similis from banana plantations down the eastern seaboard of Australia, with additional samples from Costa Rica and accessions from GenBank, to examine the origin of pest populations of R. similis. The lack of genetic diversity of R. similis within Australia, and its sharing of a worldwide pest haplotype, suggest that populations of R. similis in Australia were introduced from a single source population, most likely from the Southeast Asian region. This might not be the case in Africa, where extensive genetic diversity has been found.
相似穿孔线虫是世界上经济影响最为重大的十种植物寄生线虫之一。在香蕉种植中，它尤其成问题，因为线虫取食会降低产量并引发倒伏病。有人提出，1949年命名的穿孔线虫属可能起源于澳大利亚，但相似穿孔线虫（科布，1893年）的原生分布范围并不为人所知。在此，我们对来自澳大利亚东海岸香蕉种植园的相似穿孔线虫样本进行了系统发育地理学研究，并补充了来自哥斯达黎加的样本以及GenBank中的序列，以探究相似穿孔线虫害虫种群的起源。澳大利亚境内相似穿孔线虫缺乏遗传多样性，且与一种全球害虫单倍型相同，这表明澳大利亚的相似穿孔线虫种群是从单一源种群引入的，极有可能来自东南亚地区。非洲的情况可能并非如此，在那里已发现了广泛的遗传多样性。
