Cynoglossum officinale, a New Natural Host of Alfalfa mosaic virus

Plant Disease
M G BellardiA Pisi

Abstract

Cynoglossum officinale L. (family Boraginaceae), hound's-tongue, is a medicinal plant whose roots are used for their astringent and healing properties and for their sedative, calming, and slightly narcotic effects. This species, originating from Europe where it grows wild in mountainous fields, is cultivated only for its medicinal properties. Epidemiological surveys performed in the Emilia Romagna Region of northern Italy in the spring and autumn of 2001 revealed the presence of virus-like symptoms on C. officinale cultivated in two different locations. In the Botanical Garden of the University of Bologna, the plants showed stunting, interveinal chlorotic spots, midrib necrosis, and scarce or no seed production. In the experimental field of the Agriculture Faculty of Bologna (Imola), the plants exhibited stunting, interveinal chlorotic spots, and reduction of leaf lamina. Mechanical inoculations of sap from symptomatic leaves caused typical symptoms of Alfalfa mosaic virus (AlMV) on Chenopodium amaranticolor Coste & Reyn. (local chlorotic, necrotic lesions and systemic chlorotic vein streaking), Vigna unguicolata (L.) Walp., and Phaseolus vulgaris L. (local necrotic lesions). Using an electron microscope, examination of leaf sa...Continue Reading

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