Phomopsis leptostromiformis

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Botha, C.J. (Christoffel Jacobus)
Venter, Elna

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Abstract

DISTRIBUTION: Lupins are cultivated chiefly in the southern and south-western areas of the Cape province as a fodder crop.
BOTANICAL DESCRIPTION: Lupinus spp.: General: Spreading, erect, annual herb about 60 cm high. Leaves: Digitally compound with 7 to 11 narrow leaflets Flowers: Golden yellow, blue, white or pink. Fragrant and borne at the ends of branches. Fruit: The flat pod is slightly hairy and contains 4-5 seeds. • Phomopsis leptostromiformis (Diaporthe toxica) is a phytopathogen of most Lupinus spp. • Also grows saprophytically on the dead host under favourable conditions.
TOXIC PRINCIPLE: Cyclic hexapeptides. Phomopsin A – the principle toxin. Relatively stable toxin.
SYNDROMES: Hepatogenous photosensitivity primarily due to liver parenchymal damage.
SYSTEMS AFFECTED: Liver.
CLINICAL SIGNS: Acute lupinosis: • Sheep become sick in 2-3 days after lethal dose and die in 4-8 days. • Anorexia • Ruminal stasis• Constipation• Weakness• Icterus - Photosensitivity rare, but occurs Chronic syndrome: • Same as above, plus weight loss.
NECROPSY: Macroscopical findings: 1. Hepatosis Acute: white (also orange-yellow) swollen, fatty liver Chronic: markedly atrophic (especially left side, so-called boxing glove liver) fibrotic, nodular regeneration 2. Icterus 3. GI stasis.
HISTOPATHOLOGY: • Fatty degeneration, cholestasis • Anisonucleosis, megalocytosis, multinucleation and nuclear vesiculation.
TREATMENT: Symptomatic and supportive.

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Colour photos. Final web-ready size: JPEG. Photo 1: 19.2 kb, 72 ppi; Photo 2: 7.18 kb, 72 ppi; Photo 3: 14.6 kb, 1350 ppi; Photo 4: 35.8 kb, 72 ppi; Photo 5: 16.9 kb, 96 ppi. Original TIFF file housed at the Dept. of Paraclinical Sciences, Section Pharmacology and Toxicology, University of Pretoria.

Keywords

Plant poisoning, Toxicology, Plant poisoning in animals, Poisonous plants, Hepatogenous, Photosensitivity, Hexapeptides, Phomopsin, Phytopathogen, Lupinosis

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Citation

Botha, CJ & Venter, E 2002, 'Plants poisonous to livestock Southern Africa (CD-ROM)' University of Pretoria, Faculty of Veterinary Science, Dept. of Paraclinical Sciences, Section Pharmacology and Toxicology, Pretoria, South Africa.