Aylward Janneke, Dreyer Léanne L, Steenkamp Emma T, Wingfield Michael J, Roets Francois
Department of Botany and Zoology, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa;
Department of Microbiology and Plant Pathology, University of Pretoria, Pretoria 0002, South Africa.
IMA Fungus. 2015 Dec;6(2):471-6. doi: 10.5598/imafungus.2015.06.02.10. Epub 2015 Nov 10.
Two polyphyletic genera of ophiostomatoid fungi are symbionts of Proteaceae in southern Africa. One of these, Knoxdaviesia, includes two closely related species, K. proteae and K. capensis, that have overlapping geographical distributions, but are not known to share Protea host species. Knoxdaviesia capensis appears to be a generalist that occupies numerous hosts, but has never been found in P. repens, the only known host of K. proteae. In this study, extensive collections were made from P. repens and isolates were identified using DNA sequence comparisons. This led to the surprising discovery of K. capensis from P. repens for the first time. The fungus was encountered at a low frequency, suggesting that P. repens is not its preferred host, which may explain why it has not previously been found on this plant. The basis for the specialisation of K. proteae and K. capensis on different Protea species remains unknown.
在非洲南部，两个多系的长喙壳类真菌属是山龙眼科植物的共生菌。其中一个属，即诺克斯戴维斯菌属，包含两个亲缘关系密切的物种，即普罗蒂亚诺克斯戴维斯菌和开普诺克斯戴维斯菌，它们的地理分布重叠，但未知它们是否共享山龙眼属宿主物种。开普诺克斯戴维斯菌似乎是一种广食性真菌，占据众多宿主，但从未在普罗蒂亚诺克斯戴维斯菌唯一已知的宿主——匍匐山龙眼中被发现。在本研究中，从匍匐山龙眼中进行了大量采集，并通过DNA序列比较对分离株进行了鉴定。这首次导致了在匍匐山龙眼中意外发现开普诺克斯戴维斯菌。该真菌出现的频率较低，表明匍匐山龙眼不是其偏好的宿主，这可能解释了为什么之前在这种植物上未发现它。普罗蒂亚诺克斯戴维斯菌和开普诺克斯戴维斯菌对不同山龙眼属物种的专一性基础仍然未知。
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