TY - JOUR

T1 - Analysis of morphogenetic mutants of hydra - II. The non-budding mutant

AU - Schaller, H. C.

AU - Schmidt, T.

AU - Flick, K.

AU - Grimmelikhuijzen, C. J.P.

PY - 1977/9

Y1 - 1977/9

N2 - Non-budding mutants of Chlorohydra viridissima regenerate heads 6 h faster than Hydra attenuata and the number of tentacles per head is higher. The polarity in pieces from the gastric region is the more labile, the smaller the pieces are. In regenerates heads and tentacles form much more frequently than feet, giving rise to bipolar or multiheaded structures. Buds very seldom form under normal conditions, but they occasionally occur in regenerating animals with two cut surfaces. The higher head-forming potential in the mutant is paralleled by a higher head-activator concentration (20-fold in head, 4-fold in body), than in Hydra attenuata, which is not accompanied by an equivalent increase in head-inhibitor concentration (1.4-fold in head, 2-fold in body). The foot-activator concentration is slightly reduced (1.3-fold), the foot-inhibitor concentration is higher (1.6-fold) than in H. attenuata. The mutant is extremely insensitive to head activator, relatively insensitive to head inhibitor and foot inhibitor, but sensitive to foot activator.

AB - Non-budding mutants of Chlorohydra viridissima regenerate heads 6 h faster than Hydra attenuata and the number of tentacles per head is higher. The polarity in pieces from the gastric region is the more labile, the smaller the pieces are. In regenerates heads and tentacles form much more frequently than feet, giving rise to bipolar or multiheaded structures. Buds very seldom form under normal conditions, but they occasionally occur in regenerating animals with two cut surfaces. The higher head-forming potential in the mutant is paralleled by a higher head-activator concentration (20-fold in head, 4-fold in body), than in Hydra attenuata, which is not accompanied by an equivalent increase in head-inhibitor concentration (1.4-fold in head, 2-fold in body). The foot-activator concentration is slightly reduced (1.3-fold), the foot-inhibitor concentration is higher (1.6-fold) than in H. attenuata. The mutant is extremely insensitive to head activator, relatively insensitive to head inhibitor and foot inhibitor, but sensitive to foot activator.

KW - Bud formation

KW - Hydra mutant

KW - Morphogenetic substances

UR - http://www.scopus.com/inward/record.url?scp=0017715633&partnerID=8YFLogxK

U2 - 10.1007/BF00867321

DO - 10.1007/BF00867321

M3 - Journal article

AN - SCOPUS:0017715633

VL - 183

SP - 207

EP - 214

JO - Development Genes and Evolution

JF - Development Genes and Evolution

SN - 0949-944X

IS - 3

ER -