Morphogenesis of the brown alga Desmarestia antarctica cultivated under seasonally fluctuating Antarctic daylegths

Simple item page
dc.contributor.authorWiencke, Christian
dc.contributor.authorStolpe, Ute
dc.contributor.authorLehmann, Heiner
dc.date.accessioned2017-01-11T14:41:26Z
dc.date.available2017-01-11T14:41:26Z
dc.date.issued1991
dc.description.abstractThe development of Desmarestia antarctica has been studied under seasonally daylenghts mimicking the daylength conditions on King George Island (Antarctica). Under June conditions the sporophytes were uniseriate. Primary laterals developed in July, secondary laterals were observed in September. Cortication of the main axis and primary laterals started in October and November, respectively. Shedding of uncorticated parts was observed in the entire growth period of the sporophyte. In February all uncorticated filaments were shed. The main axis of October - November developmental stages consists of several layers of small outer cortical cells, larger inner cortical cells, into which smaller cells are interspersed, and the axial cell row. Around the axial cells a trasitory pericentral caviry is developed, which is filled in the later stages by small cells forming a sheath. Cells of the axial filament show the characteristics of trumpet cells, which imply a tansport function. Occlusions of their lumen apparent in sections of chemically fixed cells are artefacts since they were not found in clyofixed plants. X-ray microanalyses revealed considerably higher concentrations of K+ and CL- in cortical compared to axial cells, pointing to the presence of organic translocates in the axial cells. The vegetative structure of the gametophytes varies depending ont he light conditions. Gametogenesis was observed al temperatures < 5ºCes_ES
dc.identifier.citationSerie Científica, nº 41, pp. 65-78, 1991es_ES
dc.identifier.urihttp://hdl.handle.net/20.500.11894/790
dc.language.isoenes_ES
dc.relation.ispartofseriesSerie Científicaes_ES
dc.relation.ispartofseriesSerie Científicaes_ES
dc.rightsLicencia Creative Commons. Reconocimiento – NoComercial (by-nc): Se permite la generación de obras derivadas siempre que no se haga un uso comercial. Tampoco se puede utilizar la obra original con finalidades comerciales.es_ES
dc.subjectDesmarestia antarcticaes_ES
dc.subjectAlga pardaes_ES
dc.titleMorphogenesis of the brown alga Desmarestia antarctica cultivated under seasonally fluctuating Antarctic daylegthses_ES
dc.title.alternativeMorfogénesis del alga parda Desmarestia antarctica cultivada bajo longitudes de día estacionalmente fluctuantes en la Antárticaes_ES
dc.typeArtículoes_ES

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Wiencke, Stolpe, Lehmann_SerieCientífica_1991_n°41_pp.65-78.pdf
Size:
3.69 MB
Format:
Adobe Portable Document Format
Description:
Download

Collections

Serie científica
Identidad del Fin del MundoUniversidad de Magallanes• Avenida Bulnes 01855 • Punta Arenas • ChileTeléfono: +56 61 207135 • Email: walter.molina@umag.clSistema desarrollado por Prodigio Consultores en Sistema Dspace