Induction of metamorphosis with potassium ions requires development of competence and an anterior signalling centre in the ascidian Herdmania momus

Degnan, BM, Souter, D, Degnan, SM and Long, SC (1997) Induction of metamorphosis with potassium ions requires development of competence and an anterior signalling centre in the ascidian Herdmania momus. Development Genes And Evolution, 206 6: 370-376. doi:10.1007/s004270050066


Author Degnan, BM
Souter, D
Degnan, SM
Long, SC
Title Induction of metamorphosis with potassium ions requires development of competence and an anterior signalling centre in the ascidian Herdmania momus
Journal name Development Genes And Evolution   Check publisher's open access policy
ISSN 0949-944X
Publication date 1997-01-01
Sub-type Article (original research)
DOI 10.1007/s004270050066
Volume 206
Issue 6
Start page 370
End page 376
Total pages 7
Language eng
Abstract Increased Kt concentration in seawater induces metamorphosis in the ascidian Herdmania momus. Larvae cultivated at 24 degrees C exhibit highest rates of metamorphosis when treated with 40 mM KCl-elevated seawater at 21 degrees C. At 24 degrees C, H. momus larvae develop competence to respond to KCl-seawater and initiate metamorphosis approximately 3 h after hatching. Larval trunks and tails separated from the anterior papillae region, but maintained in a common tunic at a distance of greater than 60 mu m, do not undergo metamorphosis when treated with KCl-seawater; normal muscle degradation does not occur in separated tails while ampullae develop from papillae-containing anterior fragments. Normal programmed degradation of myofibrils occurs when posterior fragments are fused to papillae-containing anterior fragments. These data indicate that H. momus settlement and metamorphosis only occurs when larvae have attained competence, and suggest that an anterior signalling centre is stimulated to release a factor that induces metamorphosis.
Keyword Cell Biology
Evolutionary Biology
Developmental Biology
Ascidian
Competence
Metamorphosis
Settlement
Urochordate
Primary Sensory Neurons
Marine-invertebrates
Larval Metamorphosis
Excess Potassium
Nervous-system
Settlement
Receptors
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
 
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Created: Tue, 14 Aug 2007, 02:41:07 EST