Tibia to Femur Ratios of Unaltered and Regenerated Legs of the Stumpy Mutant of the German Cockroach : Developmental Biology

概要

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In wild-type legs of the German cockroach, the ratio of tibia length to femur length (T/F ratio) is low in the foreleg, high in the hindleg, and intermediate in the midleg throughout nymphal instars up to the adult stage. After autotomy at the trochanterofemoral articulation, regenerates from foreleg coxae show intermediate T/F ratios between the normal foreleg and midleg, and those from the hindlegs, intermediate between the normal hindleg and midleg. Those from the midlegs are unaltered in the ratios. Similar studies were made on a mutant, stumpy (sty), which has shorter legs than wild type. The relative length of sty legs to wild-type legs was around 80%, showing some fluctuation with the stage and the type of legs. The T/F ratios of unoperated sty fore-, mid-, and hindleg were, respectively, similar to those of regenerated wild-type. This suggests that sty may have primitive legs that are not fully differentiated from midleg-like nonspecific forms. The T/F ratios of regenerated sty legs were similar to those of the unoperated sty when the legs were autotomized in early instars. When the legs were autotomized in middle and late instars, the ratios of sty regenerates increased in all legs. In the adult regenerates, the ratios of the sty fore-, mid-, and hindleg almost reached those of the sty midleg, sty hindleg, and wild-type hindleg, respectively.
社団法人日本動物学会の論文
1989-10-15