Effects of Foodstuffs on Intestinal Length in Larvae of Rhacophorus arboreus (Anura: Rhacophoridae) : Developmental Biology

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概要

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• Correlation between foodstuffs and intestinal length was examined in larvae of Rhacophorus arboreus (Anura: Rhacophoridae). The larva, being heterophagous, has a tube-like intestine provided with neither epithelial outfoldings nor villi, and intestinal length is found to be a good morphological index of digestive and absorptive functions of the intestine. The results obtained were summarized as follows: The grown larva fed on boiled spinach had an intestine more than 1.5 times as long as that of a grown larve fed on scrambled eggs. Change of diet from the scrambled eggs to boiled spinach triggered intestinal lengthening in the egg-fed larvae, whose intestine had hardly elongated; and in 4days after the change of diet, intestinal length became almost equal to that of the larvae fed on boiled spinach from the beginning. The intestinal length of the larvae was proportional to the number of intestinal epithelial cells, irrespective of their diets and developmental ages before the metamorphic climax. Incorporation of [^3<H>]thymidine into DNA of intestinal epithelial cells was the highest in larvae 2days after the change of diet, but the incorporation was low in larvae whose diet was not changed. These data suggested strongly that many intestinal epithelial cells entered the S-phase of the cell cycle after the change of diet. Labeled mitotic index of intestinal epithelial cells showed a peak at 12hr after [^3<H>]thymidine administration in the diet-changed larvae. The intestinal lengthening after the change of diet would be brought by approximately 50% of the intestinal epithelial cells having divided once and followed by recovery of their cell size.

• 1989-04-15

著者

• KOSHIDA Yutaka

  Department of Biology, Graduate School of Sicience, Osaka University

• Koshida Y

  Department Of Biology Graduate School Of Sicience Osaka University

• Koshida Yutaka

  Department Of Biology Faculty Of Science Osaka University

• Horiuchi Shinri

  Department Of Biology Faculty Of Science Osaka University

• Horiuchi Shinri

  Department of Biology, College of General Education, Osaka University

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