Instability of the Number of Segments of Unoperated and Regenerated Maxillary Palpi in the Maxillary-Palp-Elongate (mpe) German Cockroach Mutant : Developmental Biology
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概要
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Maxillary-palp-elongate (mpe) is a mutant modifying the terminal (5th) segment of the wild-type palpus to a variable number of divisions, increasing the total number of segments up to 9. The supernumerary segments sometimes fuse during postembryonic development. The mutant palpi of both sides of the mouth are often asymmetric in length and in the number of segments. The mutant palpus occasionally carries a prominent bristle , never found in wild type. It resembles bristles on legs and occurs exclusively on the 4th segment, a homologous segment to the tibia of legs. The percentage of bristle-bearing palpi increases during nymphal development, and exceeds 50% in the last instar. A few mutant palpi bear more than one bristle on the 4th segment. Amputation experiments were carried out at various levels on mpe maxillary palpi. The right palpus was operated in the 2nd instar, and the regenerate was examined in the 4th and 6th instars. Irrespective of amputated levels from the 1st-2nd to the 6th-7th segment, the total number of segments of a regenerated palpus was irrelevant to that before operation. This suggests that the stump does not regenerate new segments according to a "memory" of the original number of segments. The number of segments of a regenerate was also irrelevant to that of the contralateral palpus, which suggests that the stump does not use the contralateral palpus as a "reference" for the number of segments to be regenerated. As shown in unoperated palpi, regenerated segments sometimes fused during subsequent molts. The bristle was occasionally found in the regenerated 4th segment.
- 1990-08-15
著者
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Tanaka Akira
Department of Health and Nutrition, College of Human and Environmental Studies, Kanto-Gakuin Univers
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Ross Mary
Department Of Entomology Virginia Polytechnic Institute And State University
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Tanaka Akira
Department Of Diagnostic Pathology Jichi Medical University
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