PMID: 12770391May 29, 2003Paper

Recycling of urea associated with the host plant urease in the silkworm larvae, Bombyx mori

Journal of Insect Physiology
C HirayamaH Shinbo

Abstract

Urea concentration and urease activity in the midgut content were compared between larvae of the silkworm, Bombyx mori fed an artificial diet and those fed fresh mulberry leaves. A considerable amount of urea was found in the midgut content of the both larvae, however it was significantly lower in the larvae fed fresh mulberry leaves than in the larvae fed the artificial diet; average urea concentrations in the midgut content of the larvae fed fresh mulberry leaves and the artificial diet were 2.9 and 4.6 &mgr;mol/g, respectively. Urea in the midgut content seems to be secreted from the insect itself since the amount of urea in both diets were negligibly small. Urease activity was detected only in the midgut content of the larvae fed fresh mulberry leaves but not in other tissues of the larvae. On the other hand, no urease activity was detected in the midgut content of the larvae fed the artificial diet. Subsequently, to elucidate the role of mulberry leaf urease in the midgut lumen, larvae that had been reared on the artificial diet were switched to fresh mulberry leaves. The diet switch caused a rapid decrease in urea concentration in the midgut content and an increase in ammonia concentration in the midgut content, suggestin...Continue Reading

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Jun 27, 1969·Biochemical and Biophysical Research Communications·T InokuchiT Ito
May 29, 2003·Journal of Insect Physiology·H ShinboC Hirayama
Sep 1, 1962·The Journal of Nutrition·S E SnydermanM E Balis

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Citations

Jul 6, 2000·Journal of Insect Physiology·C HirayamaM Nakamura
Mar 25, 2000·Insect Biochemistry and Molecular Biology·M OsanaiT Asakura
Jan 1, 2015·Molecular Genetics and Genomics : MGG·Liang JiangQingyou Xia
Mar 26, 2013·Biochemical and Biophysical Research Communications·Liang JiangQingyou Xia
Jul 26, 2016·Frontiers in Microbiology·Arturo Vera-Ponce de LeónEsperanza Martínez-Romero
Jun 21, 2017·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Daniele KunzCarlos P Silva
Jun 4, 2008·Neurosurgical Review·Benedicto Oscar ColliCarlos Gilberto Carlotti
Sep 5, 2014·Journal of Neuro-oncology·Seong-Hyun ParkL Dade Lunsford
Sep 1, 2017·Genome Biology and Evolution·Arturo Vera-Ponce de LeónEsperanza Martínez-Romero
Jul 12, 2005·Journal of Insect Physiology·Hitoshi KurahashiYukio Sugimura
Dec 9, 2021·Archives of Insect Biochemistry and Physiology·Shanshan TaoChongjun Ye

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