Morphological and growth alterations on early development stages of Iridaea cordata (Rhodophyta) under different intensities of UVB radiation

This study describes the effects of different intensities of UVB radiation on growth and morphology of early development stages of Iridaea cordata in germlings, young gametophytes originated in the laboratory and young fronds collected in the Magellan Strait, Chile. The experiments were carried out...

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Autores principales:	Navarro,Nelso P, Palacios,Mauricio, Mansilla,Andrés, Jofre,Jocelyn
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2010
Materias:	Algae growth germlings Magellan Strait morphology
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572010000200007
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spelling	oai:scielo:S0718-195720100002000072010-09-14Morphological and growth alterations on early development stages of Iridaea cordata (Rhodophyta) under different intensities of UVB radiationNavarro,Nelso PPalacios,MauricioMansilla,AndrésJofre,Jocelyn Algae growth germlings Magellan Strait morphology This study describes the effects of different intensities of UVB radiation on growth and morphology of early development stages of Iridaea cordata in germlings, young gametophytes originated in the laboratory and young fronds collected in the Magellan Strait, Chile. The experiments were carried out during four weeks in controlled conditions of temperature and photoperiod and the results were compared with a control treatment (without UVB). All UVB irradiation treatments caused bleaching and decrease in growth rates of germlings. Additionally, initial upright fronds were not observed in any of the UVB treatments, where as those cultivated in UVB absence developed erect ones in the second week of culture. The young gametophytes exhibited morphological alteration (small number and size of basal ramifications, curling of tips, bleaching and necrosis) and decrease in growth when exposed to UVB radiation. Young fronds collected from the field showed mainly morphological alterations (curling of frond). Morphological alterations in young gametophytes and young fronds of I. cordata could be interpreted as a defense against UVB by reducing the area exposed to radiation. However, high level of UVB radiation can produce irreparable damage, such as necrosis, observed in young gametophytes originated in the laboratory. Finally, the UVB effects on early developmental stages of I. cordata depend on the UVB irradiance and time of exposition.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.45 n.2 20102010-08-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572010000200007en10.4067/S0718-19572010000200007
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Algae growth germlings Magellan Strait morphology
spellingShingle	Algae growth germlings Magellan Strait morphology Navarro,Nelso P Palacios,Mauricio Mansilla,Andrés Jofre,Jocelyn Morphological and growth alterations on early development stages of Iridaea cordata (Rhodophyta) under different intensities of UVB radiation
description	This study describes the effects of different intensities of UVB radiation on growth and morphology of early development stages of Iridaea cordata in germlings, young gametophytes originated in the laboratory and young fronds collected in the Magellan Strait, Chile. The experiments were carried out during four weeks in controlled conditions of temperature and photoperiod and the results were compared with a control treatment (without UVB). All UVB irradiation treatments caused bleaching and decrease in growth rates of germlings. Additionally, initial upright fronds were not observed in any of the UVB treatments, where as those cultivated in UVB absence developed erect ones in the second week of culture. The young gametophytes exhibited morphological alteration (small number and size of basal ramifications, curling of tips, bleaching and necrosis) and decrease in growth when exposed to UVB radiation. Young fronds collected from the field showed mainly morphological alterations (curling of frond). Morphological alterations in young gametophytes and young fronds of I. cordata could be interpreted as a defense against UVB by reducing the area exposed to radiation. However, high level of UVB radiation can produce irreparable damage, such as necrosis, observed in young gametophytes originated in the laboratory. Finally, the UVB effects on early developmental stages of I. cordata depend on the UVB irradiance and time of exposition.
author	Navarro,Nelso P Palacios,Mauricio Mansilla,Andrés Jofre,Jocelyn
author_facet	Navarro,Nelso P Palacios,Mauricio Mansilla,Andrés Jofre,Jocelyn
author_sort	Navarro,Nelso P
title	Morphological and growth alterations on early development stages of Iridaea cordata (Rhodophyta) under different intensities of UVB radiation
title_short	Morphological and growth alterations on early development stages of Iridaea cordata (Rhodophyta) under different intensities of UVB radiation
title_full	Morphological and growth alterations on early development stages of Iridaea cordata (Rhodophyta) under different intensities of UVB radiation
title_fullStr	Morphological and growth alterations on early development stages of Iridaea cordata (Rhodophyta) under different intensities of UVB radiation
title_full_unstemmed	Morphological and growth alterations on early development stages of Iridaea cordata (Rhodophyta) under different intensities of UVB radiation
title_sort	morphological and growth alterations on early development stages of iridaea cordata (rhodophyta) under different intensities of uvb radiation
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2010
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572010000200007
work_keys_str_mv	AT navarronelsop morphologicalandgrowthalterationsonearlydevelopmentstagesofiridaeacordatarhodophytaunderdifferentintensitiesofuvbradiation AT palaciosmauricio morphologicalandgrowthalterationsonearlydevelopmentstagesofiridaeacordatarhodophytaunderdifferentintensitiesofuvbradiation AT mansillaandres morphologicalandgrowthalterationsonearlydevelopmentstagesofiridaeacordatarhodophytaunderdifferentintensitiesofuvbradiation AT jofrejocelyn morphologicalandgrowthalterationsonearlydevelopmentstagesofiridaeacordatarhodophytaunderdifferentintensitiesofuvbradiation
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Morphological and growth alterations on early development stages of Iridaea cordata (Rhodophyta) under different intensities of UVB radiation

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