Thesis Summary Studies of Alfalfa Mosaic Virus and Subterranean Clover Red Leaf Virus

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AMV was shown to be transmitted by sap, aphids and through lucerne seed, but not by Cuscuta. Virus source and test plant influenced transmission frequency. Sap-inoculation tests showed that 20 species of plants were susceptible to this virus. Thirteen species of plants from the fields where AMV had been detected were tested but only three were found to be infected with the virus. Tests for AMV in lucerne from throughout New Zealand, by sap inoculation of indicator plants, revealed that AMV was present in 35% of fields. ‘Incidence within fields ranged from 0 to 16.8% and was greatest in old stands. The incidence was the same for two lucerne cultivars. AMV multiplication in Nicotiana tabacum L. was greater at 24 than either 18 or 30°C. Maximum virus concentration occurred at the same time after inoculation irrespective of temperature. Virus concentration and symptom severity were not correlated, symptoms being most severe at 30°C. AMV concentration in leaves was positively correlated with amount of virus in the inoculum.

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تاریخ انتشار 2000