The effects of phosphate on physiological responses and carbohydrate production in Ulva fasciata (Chlorophyta) from upwelling and nonupwelling sites

Autor(es)

Figueira, Tiphane Andrade ^[1] ; Martins, Nuno Tavares ^[2] ; Ayres-Ostrock, Ligia ^[2] ; Plastino, Estela M. ^[2] ; Enrich-Prast, Alex ^[3] ; de Oliveira, Vinicius Peruzzi ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Rio de Janeiro, Inst Biol, Multiuser Unit Environm Anal, Rua Carlos Chagas Filho 373, Interbloco A-F, BR-21941902 Rio De Janeiro - Brazil

^[2] Univ Sao Paulo, Inst Biosci, Marine Algae Lab, Rua Matao 277, BR-05508090 Sao Paulo - Brazil

^[3] Linkoping Univ, Dept Themat Studies Environm Change, TEMA Huset, Entrance 37, Campus Valla, Linkoping - Sweden

• Tipo de documento: Artigo Científico
• Fonte: Botanica Marina; v. 64, n. 1, p. 1-11, FEB 2021.
• Citações Web of Science: 1

Resumo

Phosphorus is a key macronutrient inmacroalgal physiology, including carbohydrate anabolism. To determine the effects of phosphorus on different physiological parameters, we cultivated Ulva fasciata specimens from distinct localities (upwelling and non-upwelling sites) in the presence of different phosphate concentrations (0, 2, and 4 mu MPO43-). After 15 days, growth rates were similar (approx. 12% day(-1)) and carbohydrate contents had increased in individuals fromboth sites. In individuals from the upwelling site, carbohydrate contents were high in all treatments (71% dry mass), whereas non-upwelling site individuals cultivated under the highest phosphate concentration showed the lowest carbohydrate content (46% DM). Nevertheless, we observed higher rates of phosphorus uptake in individuals from the non-upwelling site cultivated under the highest phosphate concentration, indicating a stress response to elevated nutrient concentrations. Individuals from both sites cultivated with phosphate maintained healthy photosystems over the experimental period (F-v/ F-m = 0.788), whereas those cultivated in the absence of phosphate showed evidence of photosystem impairment, as indicated by a progressive decline in maximum quantum yield. Altogether, our results indicate that site origin and phosphate concentration influence the carbohydrate content in U. fasciata and that individuals from sites with broad environmental variation, such as upwelling events, can show higher productivity. (AU)

• Processo FAPESP: 14/22349-8 - Respostas fisiológicas de Ulva lactuca (Ulvales, Chlorophyta): comparação de duas populações de locais com características térmicas distintas
• Beneficiário: Nuno de Oliveira Tavares Alves Martins
• Modalidade de apoio: Bolsas no Brasil - Mestrado