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Genetics of pigmentation in Porcellio scaber Latreille, 1804 (Isopoda, Oniscidea)

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image of Crustaceana

In the sowbug, Porcellio scaber Latreille, 1804 (Isopoda, Oniscidea), the genetics of carapace and eye colour were investigated. Carapace shield colours studied include white, dark grey/brown, light orange, and a variegated phenotype consisting of an orange background with darker brownish pigmented regions. Eye colours found include colourless, red, and black. Two loci, one with two alleles the other with three alleles, can explain the patterns of inheritance we found in the carapace shield and eyes. Alleles at a single locus with incomplete dominance appear to control carapace edge colour. Interactions between some alleles at different loci were discovered and correlations between eye and carapace colours are described. Variegation was limited to females and not expressed in males of similar genotype. An der Kellerassel, Porcellio scaber Latreille, 1804 (Isopoda, Oniscidea), wurde eine Studie zur Genetik der Pigmentierung von Carapax und Augen durchgeführt. Die untersuchten Phänotypen für den Schild des Carapax schließen einen weißen, hell orangfarbenen und dunkel graubraunen Pigmentierungsphänotyp ein, sowie einen gesprenkelten Phänotyp mit dunkelbraunen Pigmentflecken auf orangenem Hintergrund. Die Augen der untersuchten Asseln waren entweder farblos, rot oder schwarz. Die aufgedeckten Vererbungsmuster können durch zwei Genloci mit zwei, beziehungsweise drei Allelen erklärt werden. Allele eines dritten Locus beeinflussen die Pigmentierung am Außenrand des Carapax und zeigen unvollständige Dominanz. Zwischen einigen Allelen der verschiedenen Genloci gibt es epistatische Wechselwirkungen. Beziehungen zwischen der Pigmentierung des Carapax und der der Augen werden beschrieben. Der gesprenkelte Phänotyp war auf weibliche Asseln beschränkt und wurde in männlichen Asseln vom gleichen Genotyp nicht exprimiert.


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