Effects of N supply on the accumulation of photosynthetic pigments and photoprotectors in Gracilaria tenuistipitata (Rhodophyta) cultured under UV radiation
Contribuinte(s) |
UNIVERSIDADE DE SÃO PAULO |
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Data(s) |
20/10/2012
20/10/2012
2011
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Resumo |
We have studied the effects of nitrate supply under photosynthetic active radiation (PAR) plus ultraviolet radiation (UVR) exposure on photosynthetic pigments (chlorophyll a and carotenoids), photoprotective UV screen mycosporine-like amino acids (MAAs), and photosynthetic parameters, including the maximum quantum yield (F(v)/F(m)) and electron transport rate (ETR) on the red agarophyte Gracilaria tenuistipitata. Apical tips of G. tenuistipitata were cultivated under ten different concentrations of NO(3)(-) for 7 days. It has been shown that G. tenuistipitata cultured under laboratory conditions has the ability to accumulate high amounts of MAAs following a nitrate concentration-dependent manner under PAR+UVR. Two MAAs were identified, shinorine and porphyra-334. The relative concentration of the first increased under high concentrations of nitrate, while the second one decreased. The presence of antheraxanthin is reported for the first time in this macro-algae, which also contains zeaxanthin, lutein, and beta-carotene. The accumulation of pigments, photoprotective compounds, and photosynthetic parameters of G. tenuistipitata is directly related to N availability. All variables decreased under low N supplies and reached constant maximum values with supplements higher than 0.5 mM NO(3)(-). Our results suggest a high potential to acclimation and photoprotection against stress factors (including high PAR and UVR) directly related to N availability for G. tenuistipitata. Ministry of Science and Innovation of Spain[CGL2008 05407-C03-01] Junta de Andalucia research group[RNM-295] National Council for Scientific and Technological Development (CNPq)[470417/2006-4] National Council for Scientific and Technological Development (CNPq)[301217/2007-6] Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) from the Ministry of Education in Brazil |
Identificador |
JOURNAL OF APPLIED PHYCOLOGY, v.23, n.3, Special Issue, p.457-466, 2011 0921-8971 http://producao.usp.br/handle/BDPI/27237 10.1007/s10811-010-9603-x |
Idioma(s) |
eng |
Publicador |
SPRINGER |
Relação |
Journal of Applied Phycology |
Direitos |
restrictedAccess Copyright SPRINGER |
Palavras-Chave | #Carotenoids #Gracilaria tenuistipitata #In vivo chlorophyll a fluorescence #N availability #Photoprotection #Photosynthesis #THERMAL-ENERGY DISSIPATION #MARINE RED ALGAE #AMINO-ACIDS MAAS #ULTRAVIOLET-RADIATION #CAROTENOID COMPOSITION #XANTHOPHYLL-CYCLE #VAR. LIUI #CHLOROPHYLL FLUORESCENCE #NITROGEN AVAILABILITY #OXYGEN EVOLUTION #Biotechnology & Applied Microbiology #Marine & Freshwater Biology |
Tipo |
article original article publishedVersion |