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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Photoacclimation in a tropical population of Cladophora glomerata (L. ) Kützing 1843 (Chlorophyta) from southeastern Brazil

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Bautista, A. I. N. ; Necchi Júnior, Orlando [2]
Total Authors: 2
Document type: Journal article
Source: Brazilian Journal of Biology; v. 68, n. 1, p. 129-136, Feb. 2008.
Field of knowledge: Biological Sciences - Botany

Photoacclimation of photosynthesis was investigated in a tropical population of C. glomerata (São Paulo State, southeastern Brazil, 20º 48 24" S and 49º 22 24" W) by chlorophyll fluorescence parameters and chlorophyll a content. Plants were acclimated to two levels of irradiance: low (65 ± 5 µmol.m-2.s-1) and high (300 ± 10 µmol.m-2.s-1) and exposed short-term (4 days) and long-term (28 days) under a light-dark cycle of 12:12 hours. Photosynthesis-irradiance (PI) curves revealed distinct strategies of photoacclimation. In long-term exposure, plants acclimated by altering the photosynthetic units (PSU) number and keeping fixed the PSU size, revealed by increased rates of maximum photosynthesis (Pmax), lower photosynthetic efficiency (alpha) and higher values of the saturation parameter (Ik) under high irradiance... (AU)

FAPESP's process: 01/06139-3 - Comparative ecophysiological analysis between species of macroalgae from lotic environments: temperature and irradiance
Grantee:Orlando Necchi Junior
Support Opportunities: Regular Research Grants