Changes in the hemolymph cationic concentration in larvae of the silkworm Bombyx mori L. exposed to selected high temperature regimes.

Malik, Firdose Ahmad and Reddy, Y. Srinivasa (2009) Changes in the hemolymph cationic concentration in larvae of the silkworm Bombyx mori L. exposed to selected high temperature regimes. Academic Journal of Entomology, 2 (1, Cop). 01-09. ISSN 1995-8994

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Abstract

The effects of high temp. on cationic compn. of hemolymph of the three selected races of the silkworm, Bombyx mori, viz., PM, NB4D2 and CSR2 during 4th moult and 5th instar larval development were investigated. Haemolymph cation levels increased significantly throughout the feeding period from 1st to 6th day in all the three races and showed a significant decrease on 7th day. Mg2+ and K+ ions were present at relatively higher levels followed by Ca2+ and Na+ both in the leaf and larval hemolymph. Among the races, hemolymph cation levels were higher in NB4D2 than CSR2 and PM. K+ levels of bivoltine races were about 30% higher than the multivoltine PM. The rates of elimination of cations were least during feeding stage than during non feeding stages resulting in higher cation levels during feeding stage. Despite increased feeding activity during active growth period, the cation levels showed significant drop in silkworm excreta suggesting that the cations are more completely absorbed during growth phase. When larvae were exposed to higher temps., monovalent cations like Na+ and K+ are hyper-regulated and divalent cations like Ca2+ and Mg2+ are hypo-regulated in order to prevent abnormal rise in the levels of hemolymph osmotic pressure. The lower levels of divalent cations in both hemolymph and excreta in larva hemolymph at higher temps. suggest that the divalent cations are sequestered by intracellular fluids to counteract osmotic desiccation of somatic cells at higher temps. [on SciFinder(R)]

Item Type: Article
Additional Information: Unmapped bibliographic data: PY - 2009/// [EPrints field already has value set] JA - Acad. J. Entomol. [Field not mapped to EPrints]
Uncontrolled Keywords: hemolymph cation larva silkworm high temp
Subjects: Agriculture Biological Sciences > Sericulture
University of Mysore > PG Campuses > Manasagangotri, Mysore > Agriculture Biological Sciences > Sericulture
Divisions: PG Campuses > Manasagangotri, Mysore > Sericulture Science
Depositing User: Kodandarama
Date Deposited: 06 Jun 2013 06:44
Last Modified: 20 Aug 2013 09:32
URI: http://eprints.uni-mysore.ac.in/id/eprint/12106

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