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

被引:71
作者
Degnan, BM [1 ]
Souter, D [1 ]
Degnan, SM [1 ]
Long, SC [1 ]
机构
[1] UNIV QUEENSLAND,CTR MOL & CELLULAR BIOL,BRISBANE,QLD 4072,AUSTRALIA
基金
澳大利亚研究理事会;
关键词
ascidian; competence; metamorphosis; settlement; urochordate;
D O I
10.1007/s004270050066
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
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.
引用
收藏
页码:370 / 376
页数:7
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