Tissue compatibility in regenerating explants from the colonial marine hydroid Hydractinia echinata (Flem.)
✍ Scribed by Steven E. Toth
- Book ID
- 102881819
- Publisher
- John Wiley and Sons
- Year
- 1967
- Tongue
- English
- Weight
- 540 KB
- Volume
- 69
- Category
- Article
- ISSN
- 0021-9541
No coin nor oath required. For personal study only.
✦ Synopsis
Artificially maintained colonies of the colonial marine hydroid Hydractinia echinata are endogenously limited in lateral growth and usually develop in a circular pattern with a closed periderm. Further lateral growth consists of free stolons. Preliminary studies of tissue compatibility in regenerating explants indicate that fusion generally fails to occur if the opposing explants are of differing sex, from different individuals of the same sex, or if peripheral explant contact occurs after free stolons have begun to form. Of the three aforementioned causes of fusion failure, the most important factor appears to be the timing of peripheral explant contact. If regeneratinq explants contact each other before the endogenous circular growth pattern is achieved, fusion will occur regardless of sex and/or individuality. Incompatibility between explants from the same individual may be because oP periderm development inhibition in some instances. However, the failure o€ free stolon Pusion between explants from the same individual suggests the development of "temporal specificity" once the endogenous limit of lateral growth is achieved.