Incidence of Lettuce Mosaic Virus in Imported Lettuce Seed

Hall, Christine; Bennett, A. H.

doi:10.1111/j.1365-3059.1970.tb01019.x

Plant Pathology

1970

DOI: 10.1111/j.1365-3059.1970.tb01019.x

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Incidence of Lettuce Mosaic Virus in Imported Lettuce Seed

Christine Hall

A. H. Bennett

Abstract: Seventeen samples of imported lettuce seed were tested for infection with lettuce mosaic virus. Only two samples had an infection level greater than one per cent. The results indicate that the amount of virus entering the United Kingdom in imported lettuce seed is likely to be low.

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1971

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Pepper veinal mottle virus‐a new member of the potato virus Y group from peppers (Capsicum annuum L. and C. frutescens L.) in Ghana

Brunt¹,

Kenten

1971

Annals of Applied Biology

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Pepper veinal mottle virus (PVMV), a previously undescribed virus widespread in Capsicumannuum and C. frutescens in the Eastern Region of Ghana, is acquired and inoculated in 2 min feeding periods by aphids (Myxuspersicae and Aphisgossypii); it is transmissible by inoculation of sap to eleven of fifteen Solanaceae and to five of forty-six other species within three of seventeen other families. The virus was propagated in Nicotiana clevelandii and Petunia hybrida, and assayed in Chenopodium quinoa, C. amaranticolor and C. murale. Sap from Capsicum annuum was infective after dilution to I O -~ but not I O -~, after 10 min at 55 but not 60 "C, and after 7 but not 8 days at 25 "C. Lyophilized sap from P. hybrida was infective after 6 years in vacuo.Yields of 10-25 mg of virus per kg of leaf tissue were consistently obtained from P . hybrida or N . clevelandii by extracting systemically infected leaves in 0.5 M borate (pH 7.8) containing 0.2 % mercaptoethanol and chloroform, followed by repeated precipitation with 50 g polyethylene glycol (M.w. 6000) per 1, several cycles of differential centrifugation and centrifugation in sucrose density-gradient columns. Virus preparations had ultraviolet absorption spectra typical of a nucleoprotein containing c. 6 yo nuclei acid (A 2601280 = 1.25; A 260/246 = 1.27) and contained numerous unaggregated and unbroken filamentous particles c. 770 x 12 nm which sedimented as a single component with a sedimentation coefficient (s&~) of 155 S. PVMV contained RNA (moles yo: G = 24, A = 23, C = 27, U = 26), and a single protein species with a molecular weight of ~2 o o c -~~o o o daltons. PVMV was not serologically related to potato virus Y (three strains), or to twelve other morphologically similar viruses, and seems to be a distinct member of the potato virus Y group. A previously undescribed virus, which we call pepper veinal mottle virus (PVMV), is prevalent in Capsicum annuum L. and C. frutescens L. in the Eastern Region of Ghana. We here describe the main properties of PVMV, a new member of the potato 236 A. A. BRUNT AND R. H. KENTEN virus Y group (Brandes, I 964), and a purification procedure consistently yielding 10-25 mg of virus/kg of leaf.

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Pepper veinal mottle virus‐a new member of the potato virus Y group from peppers (Capsicum annuum L. and C. frutescens L.) in Ghana

Brunt¹,

Kenten

1971

Annals of Applied Biology

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Incidence of Lettuce Mosaic Virus in Imported Lettuce Seed

Abstract: Seventeen samples of imported lettuce seed were tested for infection with lettuce mosaic virus. Only two samples had an infection level greater than one per cent. The results indicate that the amount of virus entering the United Kingdom in imported lettuce seed is likely to be low.

Cited by 1 publication

References 1 publication

Pepper veinal mottle virus‐a new member of the potato virus Y group from peppers (Capsicum annuum L. and C. frutescens L.) in Ghana

Pepper veinal mottle virus‐a new member of the potato virus Y group from peppers (Capsicum annuum L. and C. frutescens L.) in Ghana

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