期刊
CIENCIAS MARINAS
卷 28, 期 4, 页码 381-392出版社
INSTITUTO INVESTIGACIONES OCEANOLOGICAS, U A B C
DOI: 10.7773/cm.v28i4.236
关键词
cryptophyceae; photoacclimation; phycoerythrin; P-I curves; Rhodomonas salina
The effects of different incident irradiances on growth, photosynthesis, pigment content and nutrient uptake were studied in dense cultures of the cryptophyte Rhodomonas salina (Wislouch) Hill y Wetherbee. Cells were grown for ten days at different incident irradiances: 11, 33, 75, 260 and 320 mumol photon m(-2) s(-1). The average pigment content (phycoerythrin and chlorophyll a) was lower when cells were grown at high irradiances (260 and 320 mumol photon m(-2) s(-1)) compared with cells grown under low irradiances (11, 33 and 75 mumol photon m(-2) s(-1)). The maximum photosynthetic rate (P-max) was maximal at 75 mumol photon m(-2)s(-1) decreasing considerably at the highest irradiance in which apparent photosynthetic efficiency per cell and per chlorophyll a unit (alpha(cell) and alpha(chla)) also decreased. Results showed that dense cultures of R. salina grew optimally in a range between 75 and 260 mumol photon m(-2) s(-1) with optimal photosynthetic performance at 75 mumol photon m(-2) s(-1). Nitrogen and phosphorus depletion occurred as a consequence of the exponential growth, except under the lowest and the highest irradiances (11 and 320 l.Lmol photon m(-2) s(-1), respectively). Associated to N-limitation, phycoerythrin (PE) and chlorophyll a decreased considerably. It is suggested that R.salina responds to nitrogen-depleted conditions by mobilizing nitrogen from PE, this behaviour being modelled by a relationship between external nitrogen availability and PE mobilization.
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