Gravitropism and phototropism in protonemata of the moss Pohlia nutans (hedw.) Lindb

Gravitropism and phototropism in protonemata of the moss Pohlia nutans (hedw.) Lindb

The gravitropism of protonemata of Pohlia nutans is described and compared with that of other mosses. In darkness, protonemata showed negative gravitropism. Under uniform illumination they grew radially over the substrate surface, whereas unilateral illumination induced positive phototropic growth....

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Veröffentlicht in:Advances in space research 1999, Vol.23 (12), p.1999-2004
Hauptverfasser: Demkiv, O.T., Kordyum, E.L., Kardash, O.R., Khorkavtsiv, O.Ya
Format: Artikel
Sprache:eng
Schlagworte:
Bryopsida - cytology
Bryopsida - growth & development
Bryopsida - radiation effects
Darkness
Gravitation
Gravitropism - physiology
Light
Lighting
Phototropism - physiology
Plastids - physiology
Space life sciences
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Zusammenfassung:The gravitropism of protonemata of Pohlia nutans is described and compared with that of other mosses. In darkness, protonemata showed negative gravitropism. Under uniform illumination they grew radially over the substrate surface, whereas unilateral illumination induced positive phototropic growth. Gravitropism was coupled with starch synthesis and amyloplast formation. Protonematal gravitropic growth is more variable than the strict negative gravitropism of Ceratodon chloronema.
ISSN:0273-1177
1879-1948
DOI:10.1016/S0273-1177(99)00349-X