Seasonal changes in the phylloplane of genus <em>Gnetum</em> (Gnetaceae) representatives in greenhouse conditions

Ianina Bogdanova; Anatoly Pautov; Marina Zelenskaya; Elena Krylova; Dmitry Vlasov

doi:10.21638/spbu03.2019.405

Authors

Ianina Bogdanova Laboratory of Paleobotany, Komarov Botanical Institute, Russian Academy of Sciences, Professora Popova Str., 2, Saint Petersburg, 197376, Russian Federation https://orcid.org/0000-0002-0378-0773
Anatoly Pautov Department of Botany, Faculty of Biology, Saint Petersburg State University, Universitetskaya nab., 7–9, Saint Petersburg, 199034, Russian Federation https://orcid.org/0000-0001-7603-4539
Marina Zelenskaya Department of Botany, Faculty of Biology, Saint Petersburg State University, Universitetskaya nab., 7–9, Saint Petersburg, 199034, Russian Federation https://orcid.org/0000-0003-3588-8583
Elena Krylova Department of Botany, Faculty of Biology, Saint Petersburg State University, Universitetskaya nab., 7–9, Saint Petersburg, 199034, Russian Federation https://orcid.org/0000-0003-0686-0661
Dmitry Vlasov Department of Botany, Faculty of Biology, Saint Petersburg State University, Universitetskaya nab., 7–9, Saint Petersburg, 199034, Russian Federation; Laboratory of Fungal Biochemistry, Komarov Botanical Institute, Russian Academy of Sciences, Professora Popova Str., 2, Saint Petersburg, 197376, Russian Federation https://orcid.org/0000-0002-0455-1462

DOI:

https://doi.org/10.21638/spbu03.2019.405

Abstract

The leaf surface, or phylloplane, is inhabited by various microorganisms. Micromycetes are typical organisms of the phylloplane that are able to exert negative effects on plants. Seventeen species of micromycetes were indicated in the phylloplanes of G. gnemon and G. montanum. Micromycetes form biofilms on the surface of the upper epidermis. In the lower epidermis, they mainly colonize cork warts and destroy their cells. Collapsing cells and the micromycetes are isolated from the living tissues of leaves by layers of densely arranged cells. During changes from season to season, the number of disappearing micromycete species in the upper epidermis is approximately equal to the number of appearing new species. The total number of micromycete species in the phylloplane of the lower epidermis is reduced in winter. Structural organization, biodiversity, seasonal changes in the phylloplane and the influence of its micromycetes on leaf cells differ in the upper and lower epidermis of Gnetum leaves.

Keywords:

phylloplane, micromycetes, Gnetum, epidermis, cork warts

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