Nitrogen uptake by gametophytes of Porphyra dioica (Bangiales, Rhodophyta) under controlled-culture conditions

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Rui Pereira (Autor) Outra; George Kraemer (Autor) Outra; Charles Yarish (Autor) Outra; Isabel Sousa Pinto (Autor) FCUP

Revista

Título: European Journal of Phycology

Vol. 43

Páginas: 107-118

ISSN: 0967-0262

Editora: Taylor & Francis

Indexação

ISI Web of Knowledge - 29 Citações

Scopus - 27 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Ciências da terra e ciências do ambiente

Outras Informações

ID Authenticus: P-004-1Q4

DOI: 10.1080/09670260701763393

Abstract (EN): Aspects of the nutrient-uptake physiology of Porphyra dioica (Brodie et Irvine) from Porto, Portugal were investigated under laboratory conditions. The capacity for uptake and accumulation of nitrogen (N) by P. dioica was determined for two different N sources, ammonium (NH4+) and nitrate (NO3(-)). The influence of the light-dark cycle and of the simultaneous presence of NH4+ and NO3-, as well as the effects of phosphorus (P) enrichment, on the growth, nutrient uptake, and accumulation were also evaluated. Porphyra dioica was able to take up, accumulate, and grow equally well using both sources of nitrogen when presented separately. The photosynthetic pigment levels increased significantly with the increase of the availability of N, for both sources. The chlorophyll a content was higher in thalli that used NO3- as source of N, while this difference was not seen for phycobiliprotein content. When both N sources were available (NO3: NH4 = 6: 1), P. dioica preferentially removed NH4+, with a clear diurnal difference. During the light period, the algae removed 70% of the NH4+ available, while only 35% was removed during the dark period. Phosphorus enrichment did not influence the growth rate or the amount of P removed from the medium, suggesting a limited capacity to store P. These results indicate that P. dioica is a good candidate for application in an integrated multi-trophic aquaculture (IMTA) system.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 12