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Die Ultrastruktur einiger Flechten nach langen Trockenzeiten

The ultra structure of some lichens after long dry periods

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Summary

The ultrastructure of the phycobionts fromRhizocarpon geographicum, Umbilicaria pustulata andRamalina maciformis is described from thalli which were fixed short time after collecting them and after different periods of dryness up to four years. By demonstrating only little changes in the phycobiont ultrastructure of dry thalli their well known resistance to dryness could be confirmed. Rewetting the lichens induced the appearence of starch and some other alterations in the phycobiont ultrastructure which depend of the rewetting conditions.

Zusammenfassung

Rhizocarpon geographicum, Umbilicaria pustulata undRamalina maciformis wurden für elektronenmikroskopische Untersuchungen ihrer Phycobionten kurze Zeit nach dem Sammeln dieser Flechten und nach verschieden langen Trockenperioden bis zu 4 Jahren fixiert. Die beobachteten geringen Änderungen in den Phycobionten nach langer Trockenzeit bestätigen die große Trockenresistenz der Flechten. Eine erneute Befeuchtung der Flechten führt im allgemeinen zum Auftreten von Stärke in den Phycobionten Chromatophoren und zu einigen anderen Änderungen, die von der Temperatur und der Belichtung während der Befeuchtung abhängen.

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Author notes

  1. Elisabeth Peveling

    Present address: Botanisches Institut der Westfälischen Wilhelms-Universität, Münster, Bundesrepublik Deutschland

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    1. Elisabeth Peveling
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    Mit Unterstützung der Deutschen Forschungsgemeinschaft.

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    Peveling, E. Die Ultrastruktur einiger Flechten nach langen Trockenzeiten. Protoplasma 92, 129–136 (1977). https://doi.org/10.1007/BF01280205

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    • DOI: https://doi.org/10.1007/BF01280205

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