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Encasement of Erysiphe graminis haustoria after treatment with bromuconazole by Mangin-Peyrard, Madeleine; Pépin, Régis is a Agricultural and Biological Sciences article available to read on EtoBox.

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Preventive application of bromuconazole caused reduction in size and increased encasement rate of haustoria of Erysiphe graminis DC. For example, seven days after inoculation, 60 and 70% of haustoria had been encased in leaves treated with 8 mg litre-' and 16 mg litre-' respectively; the average length of the digitations was 8-10 pm in treated cells compared to 24 pm in untreated cells. The encasement process extended from the neck region to the whole haustorium. Haustorial bodies from treated plants had electron-dense cytoplasm and their organelles were more difficult to identify than in control plants. Extrahaustorial matrix was reduced to an unusually thin, osmiophilic pellicle, surrounded by abundant heterogeneous encasement material. Curative treatment induced similar changes, especially in the margin of the colonies. In the centre of the colony, haustoria were less affected by the fungicide ; deposition of collar-like material, modification of extrahaustorial matrix and membrane and accumulation of plant cytoplasm around the digitations resulted in an intermediate, 'swollen' state of digitate haustoria. The possible pathway of encasement events is discussed.

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Author

Mangin-Peyrard, Madeleine; Pépin, Régis

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 1526-498X)

Published

1996

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)