Sexual differentiation inPelmatohydra robusta. I. Response to a temperature change is dependent on the duration of an asexual period after hatching
✍ Scribed by Noda, Koichi
- Publisher
- John Wiley and Sons
- Year
- 1982
- Tongue
- English
- Weight
- 554 KB
- Volume
- 221
- Category
- Article
- ISSN
- 0022-104X
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✦ Synopsis
Abstract
Pelmatohydra robusta were cultured at 18°C in an asexual state for 1‐8 months after hatching and then transferred to 10°C to induce sexual differentiation. When hydra were transferred to the lower temperature within a few months after hatching, they required a much longer time for the formation of mature germ cells than did hydra transferred 6‐8 months after hatching. This indicates that the onset of budding in P. robusta is not always accompanied by sexual maturation. An asexual period of 6‐7 months was required for P. robusta to become sufficiently mature for sexual differentiation. During the asexual period, the growth required for sexual maturation progressed uniformly within a clone, regardless of the budding status of the individual polyps. This indicates that part (or all) of a clone is not rejuvenated by budding.