scholarly journals Genetic Analysis of Developmental Mechanisms in Hydra. XXII. Two Types of Female Germ Stem Cells Are Present in a Male Strain ofHydra magnipapillata

1995 ◽  
Vol 172 (1) ◽  
pp. 324-336 ◽  
Author(s):  
Chiemi Nishimiya-Fujisawa ◽  
Tsutomu Sugiyama
Keyword(s):  
Stem Cells ◽  
Genetic Analysis ◽  
Developmental Mechanisms ◽  
Male Strain

Genetic analysis of developmental mechanisms in hydra

1986 ◽  
Vol 115 (1) ◽  
pp. 249-255 ◽  
Author(s):  
Eucaly Kobatake ◽  
Tsutomu Sugiyama
Keyword(s):  
Genetic Analysis ◽  
Developmental Mechanisms

Genetics: Genetic Analysis of Developmental Mechanisms in Drosophila

Nature ◽  
1971 ◽  
Vol 234 (5326) ◽  
pp. 187-194 ◽  
Author(s):  
HOWARD A. SCHNEIDERMAN ◽  
PETER J. BRYANT
Keyword(s):  
Genetic Analysis ◽  
Developmental Mechanisms

scholarly journals Genetic analysis of developmental mechanisms in Hydra. II. Isolation and characterization of an interstitial cell-deficient strain

1978 ◽  
Vol 29 (1) ◽  
pp. 35-52 ◽  
Author(s):  
T. Sugiyama ◽  
T. Fujisawa
Keyword(s):  
Genetic Analysis ◽  
Mutant Strain ◽  
Interstitial Cell ◽  
Interstitial Cells ◽  
Nerve Cells ◽  
Isolation And Characterization ◽  
Developmental Mechanisms ◽  
Hydra Magnipapillata

A mutant strain (nf-I) of Hydra magnipapillata was isolated that contained no interstitial cells, nerve cells or nematocytes. This strain appeared spontaneously in a sexually inbred clone of hydra, and it was recognized by its inability to eat. When force-fed, however, it grew, multiplied by budding and regenerated. In this and in many other respects, nf-I was very similar to the interstitial cell-deficient strain produced by Campbell (1976) by means of colchicine. A chimera strain was produced by the reintroduction of interstitial cells from another strain into nf-I. The properties of nf-I, the chimera and other related strains were examined, and the possible roles that the interstitial cells and the nerve cells play in growth and morphogenesis of hydra are discussed.

TheHandlebarsgene is required withPhantasticafor dorsoventral asymmetry of organs and for stem cell activity inAntirrhinum

Development ◽  
2001 ◽  
Vol 128 (11) ◽  
pp. 1923-1931 ◽  
Author(s):  
Richard Waites ◽  
Andrew Hudson
Keyword(s):  
Stem Cells ◽  
Stem Cell ◽  
Genetic Analysis ◽  
Cell Activity ◽  
Vegetative Development ◽  
Dorsoventral Axis ◽  
Lateral Organs ◽  
Stem Cell Activity ◽  
Lateral Organ ◽  
Floral Meristems

In angiosperms, individual lateral organs and whole flowers may develop asymmetrically along their dorsoventral axes. Dorsoventral asymmetry of Antirrhinum leaves requires activity of the Phantastica gene and other factors acting redundantly with it. We describe the effects of a mutation in the Handlebars gene, identified as an enhancer of the phantastica mutant phenotype. Genetic analysis suggests that Handlebars functions redundantly with Phantastica to promote dorsal fate in lateral organs and to maintain activity of stem cells within shoot apical meristems. Handlebars appears dispensable in vegetative development but is needed for asymmetry of petals along the dorsoventral axis of the flower as a whole. This suggests that common mechanisms may control dorsoventral asymmetry in lateral organ primordia and in floral meristems.

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