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Titolo:
Time-lapse videomicroscopy of cell (spore) movement in red algae
Autore:
Pickett-Heaps, JD; West, JA; Wilson, SM; McBride, DL;
Indirizzi:
Univ Melbourne, Sch Bot, Parkville, Vic 3052, Australia Univ Melbourne Parkville Vic Australia 3052 arkville, Vic 3052, Australia Coll Rockies, Cranbrook, BC V1C 5L7, Canada Coll Rockies Cranbrook BC Canada V1C 5L7 s, Cranbrook, BC V1C 5L7, Canada
Titolo Testata:
EUROPEAN JOURNAL OF PHYCOLOGY
fascicolo: 1, volume: 36, anno: 2001,
pagine: 9 - 22
SICI:
0967-0262(200102)36:1<9:TVOC(M>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIFE-HISTORY; RHODOPHYTA; SETTLEMENT; PLANTS;
Keywords:
motility; red algae; Rhodophyta; spores;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Pickett-Heaps, JD Univ Melbourne, Sch Bot, Parkville, Vic 3052, Australia Univ Melbourne Parkville Vic Australia 3052 , Australia
Citazione:
J.D. Pickett-Heaps et al., "Time-lapse videomicroscopy of cell (spore) movement in red algae", EUR J PHYC, 36(1), 2001, pp. 9-22

Abstract

The red algae generally are considered to have no motile stages. We have confirmed sporadic reports of motile spores in a few red algae by recording freshly released live spores with time-lapse videomicroscopy. Of the 25 + species investigated, only a few had spores that appeared to be immobile. Cells of unicellular species often displayed active movement although were otherwise indistinguishable from nearby immobile cells, and these may be equivalent to the motile spores released after differentiation in more complex multicellular species. There was considerable variation among members of the Bangiophycidae. Cells of Porphyridium often moved at around 0.66 mum s(-1) and had conspicuous mucilage tails. Flintiella and Rhodosorus showed no cellular movement. Rhodosorus sometimes moved a little and all four strains displayed continuous cytoplasmic rotation within the wall. Glaucosphaera was inert but displayed formation and transport of Vesicles from the perinuclear region to the surface where they were discharged. Spores (whether monospores, tetraspores or carpospores) of almost all other species or strains available displayed various forms of motility. Some (e.g. Batrachospermum-Chantransia monospores) showed smooth, directional and continuous gliding (c.2.2 mum s(-1)) for shorter or longer distances, clearly detectable to the naked eye through the microscope. In others, movement could be almost as fast or slower, non-continuous and undirectional. Certain spores (e.g. monospores of the filamentous Audouinella sp.) were amoeboid, and in some cases (e.g. Sahlingia) cells actively squeezed through the irregular interstices of a crustose colony. The mechanism of movement is unknown; polysaccharide secretion may be involved in some cases. These forms of motility may be significant as dispersal mechanisms, by moving spores out of the stagnant boundary layer, and in settling processes, by allowing spores limited ability tooptimize their site of germination.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 11:47:31