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Is the distribution of Fiji leaf gall in Australian sugarcane explained by variation in the vector Perkinsiella saccharicida?

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Ridley, A.W., Dhileepan, K., Johnson, K.N., Allsopp, P.G., Nutt, K.A., Walter, G.H. and Croft, B.J. (2006) Is the distribution of Fiji leaf gall in Australian sugarcane explained by variation in the vector Perkinsiella saccharicida? Australasian Plant Pathology, 35 (2). pp. 103-112.

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Article Link: http://dx.doi.org/10.1071/AP06011

Publisher URL: http://www.publish.csiro.au/


Fiji leaf gall (FLG) is an important virally induced disease in Australian sugarcane. It is confined to southern canegrowing areas, despite its vector, the delphacid planthopper Perkinsiella saccharicida, occurring in all canegrowing areas of Queensland and New South Wales. This disparity between distributions could be a result of successful containment of the disease through quarantine and/or geographical barriers, or because northern Queensland populations of Perkinsiella may be poorer vectors of the disease. These hypotheses were first tested by investigating variation in the ITS2 region of the rDNA fragment among eastern Australian and overseas populations of Perkinsiella. The ITS2 sequences of the Western Australian P. thompsoni and the Fijian P. vitiensis were distinguishable from those of P. saccharicida and there was no significant variation among the 26 P. saccharicida populations. Reciprocal crosses of a northern Queensland and a southern Queensland population of P. saccharicida were fertile, so they may well be conspecific. Single vector transmission experiments showed that a population of P. saccharicida from northern Queensland had a higher vector competency than either of two southern Queensland populations. The frequency of virus acquisition in the vector populations was demonstrated to be important in the vector competency of the planthopper. The proportion of infected vectors that transmitted the virus to plants was not significantly different among the populations tested. This study shows that the absence of FLG from northern Queensland is not due to a lack of vector competency of the northern population of P. saccharicida.

Item Type:Article
Corporate Creators:Department of Employment, Economic Development and Innovation (DEEDI), Agri-Science, Crop and Food Science , Biosecurity Queensland, QPIF, DNR&W
Business groups:Crop and Food Science, Biosecurity Queensland
Additional Information:© Australasian Plant Pathology Society.
Keywords:Acquisition; Fiji disease virus; Perkinsiella; reovirus; transmission.
Subjects:Science > Zoology > Invertebrates > Insects
Plant pests and diseases > Individual or types of plants or trees > Sugarcane
Live Archive:16 Nov 2009 06:13
Last Modified:03 Sep 2021 16:43

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