Control of phototactic migration in Dictyostelium discoideum
Phototactic migration of pseudoplasmodia of the cellular slime mold, Dictyostelium discoideum, is directed by a response at the anterior tip. Horizontal light appears to be focused by refraction at the surface of the pseudoplasmodium such that it acts preferentially on the distal cells. We have been...
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Veröffentlicht in: | Experimental cell research 1973-11, Vol.82 (1), p.236-240 |
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Sprache: | eng |
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Zusammenfassung: | Phototactic migration of pseudoplasmodia of the cellular slime mold,
Dictyostelium discoideum, is directed by a response at the anterior tip. Horizontal light appears to be focused by refraction at the surface of the pseudoplasmodium such that it acts preferentially on the distal cells. We have been able to show that light stimulates the rate of pseudoplasmodial movement up to 80%. This increase is dependent on the intensity of the incident light. Thus it appears that light can control the direction of migration by increasing the rate of movement on the distal side. The anterior cells are then turned toward the light by cohesion to the more slowly moving proximal side. Migration rate in the dark may be limited by the rate of synthesis or deposition of the surface sheath surrounding the pseudoplasmodium. It is suggested that light increases the rate of migration by stimulating the formation of the surface sheath. Localized stimulation would then result in a turning response. |
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ISSN: | 0014-4827 1090-2422 |
DOI: | 10.1016/0014-4827(73)90266-8 |