Partielle Albiflora-Form bei Dactylorhiza majalis

Dactylorhiza majalis
In einem Bachgrunds mit etwa 2,000 Breitblättrigen Knabenkräutern (Dactylorhiza majalis) am Südrand der Rhön steht auch eine Gruppe von drei Albiflora-Pflanzen, zusammen mit Menyanthes trifoliata, Caltha palustris und anderen Feuchtbiotop-Pflanzen. Noch interessanter war aber eine weitere Albiflora-Pflanze in einer Entfernung von etwa 40 Metern. Direkt daneben wächst eine Orchidee mit einer partiellen Albiflora-Form: Die meisten Blüten haben die purpurne Standardfarbe, aber einige Blüten sind teils purpurn, teils weiß – entweder in der Lippe oder in den Petalen.
Dactylorhiza majalisHier spielte die genetische Allele mit der Information für die Albiflora-Form offenbar eine gewisse Rolle – wird aber dominiert von der DNA mit der Information für die Standard-Farbe. Diese Beobachtung wie eine ähnliche in Südfrankreich bei Anacamptis morio wirft Fragen zum rezessiven Charakter der Albiflora-Allele auf. Es könnte manche Fälle geben, bei denen die Albiflora-Allele der einen Eltern-Pflanze von der dominanten Allele der anderen nicht völlig unterdrückt wird. Das Ergebnis wären dann solche purpur-weiß gefleckten Blüten. Bevor ich den Ausflug in die Südliche Rhön mit dem Besuch einer wunderschönen Wiese mit hunderten von Anacamptis morio (darunter zwei Albiflora-Formen) und Orchis mascula fortsetzte, nutzte ich noch die Morgensonne, um einige weitere Fotos des Albiflora-Trios von Dactylorhiza majalis aufzunehmen: Dactylorhiza majalis

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