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Studies on the rustMaravalia cryptostegiae, a potential biological control agent of rubber-vine weed (Cryptostegia grandiflora, Asclepiadaceae: Periplocoideae) in Australia, I: Life-cycle

  • Plant Mycology And Crop Protection
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Abstract

Three spore types are described forMaravalia cryptostegiae: hemileioid ‘urediniospores’; thin-walled, hyaline, ellipsoidal, non-resting teliospores and ovoid to lacrimoid basidiospores. Field surveys in the Madagascan native range of rubber-vine failed to confirm the existence of spermogonia and morphologically distinct aecia within the life-cycle. Greenhouse inoculations with basidiospores were unsuccessful. Cytological studies revealed that rubber-vine rust has a similar nuclear cycle to that reported for coffee leaf rust,Hemileia vastatrix. The working hypothesis is proposed thatMaravalia cryptostegiae is a primitive, autoecious tropical forest rust with only a short or partially expanded life-cycle represented by two teliospore forms. The predominant, functional form is uredinioid with a novel nuclear cycle, in which there is a delayed meiotic division (the Kamat phenomenon). The non-dispersed form appears to be vestigial or non-functional since it germinates to produce a metabasidium with genetically variable and unstable basidiospores. The relationships and evolutionary significance of the generaMaravalia andHemileia are discussed.

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  1. CAB International Institute of Biological Control (IIBC), Silwood Park, SL5 7TA, Ascot, Berks, UK

    Harry C. Evans

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  1. Harry C. Evans
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Evans, H.C. Studies on the rustMaravalia cryptostegiae, a potential biological control agent of rubber-vine weed (Cryptostegia grandiflora, Asclepiadaceae: Periplocoideae) in Australia, I: Life-cycle. Mycopathologia 124, 163–174 (1993). https://doi.org/10.1007/BF01103734

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  • DOI: https://doi.org/10.1007/BF01103734

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