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Pearl millet downy mildew (Sclerospora graminicola): Zoosporogenesis

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Summary

Cleavage of the zoosporangial cytoplasm ofSclerospora graminicola, the causal agent of pearl millet downy mildew, is by means of the fusion of cleavage vesicles and vesicles containing the extruded axoneme with the cell membrane. This type of zoosporogenesis linksS. graminicola to other Peronosporalean species, and is very similar to that seen for all uniflagellate species examined to date, while it separates it from species of theSaprolegniales where zoosporogenesis is brought about by the expansion of the central vacuole, or where the plasmalemma alone is used.

The origin of the cleavage vesicles appears to be from the dictyosomes and not from the finger-print bodies which are rapidly formed in large numbers after axoneme formation and after the cleavage. vesicles have started to appear in the cytoplasm.

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Authors and Affiliations

  1. Danish Government Institute of Seed Pathology for Developing Countries, Ryvangs Allé 78, DK-2900, Hellerup, Denmark

    L. Lange

  2. Institute of Genetics, Copenhagen

    L. W. Olson

  3. Downy Mildew Laboratory, University of Mysore, Mysore

    K. M. Safeeulla

Authors
  1. L. Lange
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  2. L. W. Olson
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  3. K. M. Safeeulla
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Lange, L., Olson, L.W. & Safeeulla, K.M. Pearl millet downy mildew (Sclerospora graminicola): Zoosporogenesis. Protoplasma 119, 178–187 (1984). https://doi.org/10.1007/BF01288872

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  • DOI: https://doi.org/10.1007/BF01288872

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