Effects of the pH on growth and morphology of Anabaenopsis elenkinii MILLER (Cyanobacteria) isolated from the alkaline shallow lake of the Brazilian Pantanal

Autor(es)

de Souza Santos, Kleber Renan ^[1] ; Jacinavicius, Fernanda Rios ^[1] ; Sant'Anna, Celia Leite ^[1]

Afiliação do(s) autor(es)

^[1] Inst Bot, Lab Phycol, Av Miguel Estefano 3687, BR-04301902 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Fottea; v. 11, n. 1, p. 119-126, JUL 2011.
• Citações Web of Science: 12

Resumo

Anabaenopsis elenkinii MILLER forms bloom in the alkaline shallow lakes of the Brazilian Pantanal. The A. elenkinii CCIBT1059 strain was isolated from one of these alkaline lakes and the experiments were made in growth chamber during 30 days, under modified medium BG-11 (3 % NaNO3), temperature 25 degrees C, photoperiod 12-12 light-dark cycle and irradiance of 80-100 mu mol photons m(-2) s(-1) at three different pH values: 7.0, 9.5 and 10.5. In relation to growth rate and cell yield the higher values were observed at pH 10.5. Morphologically, the longest trichomes were found at pH 7 (maximum 45 cells) in comparison with pH 9.5 (maximum 32 cells) and pH 10.5 (maximum 23 cells). The occurrence of heterocytes was observed in all treatments, but akinetes were never formed. The morphometric variability within each treatment between exponential and stationary growth was clearly higher than the variability among different treatments in most cases. Our results indicate that A. elenkinii is typical of alkaline systems and also that in lower pH values the growth limitation can occur in terms of number of cells and biomass. This study represents the first experimental evidence of the effects of pH on growth rate, cell yield and morphometric variability of A. elenkinii. (AU)

• Processo FAPESP: 09/51655-1 - Estudos de desenvolvimento, moleculares e do potencial biotecnológico em cepas de cianobactérias provenientes de lagoas salinas do Pantanal da Nhecolândia, MS, Brasil: Anabaenopsis elenkinii (Nostocales) e Arthrospira platensis (Oscillatoriales)
• Beneficiário: Kleber Renan de Souza Santos
• Modalidade de apoio: Bolsas no Brasil - Doutorado