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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.)

Seasonal variation in antioxidants in leaves of young plants of Caesalpinia echinata Lam. (brazilwood)

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Author(s):
Patricia Bulbovas [1] ; Mirian C.S. Rinaldi [2] ; Welington B.C. Delitti [3] ; Marisa Domingos [4]
Total Authors: 4
Affiliation:
[1] Universidade de São Paulo. Departamento de Ecologia Geral. Instituto de Biociências - Brasil
[2] Instituto de Botânica. Seção de Ecologia - Brasil
[3] Universidade de São Paulo. Departamento de Ecologia Geral. Instituto de Biociências - Brasil
[4] Instituto de Botânica. Seção de Ecologia - Brasil
Total Affiliations: 4
Document type: Journal article
Source: Rev. bras. Bot.; v. 28, n. 4, p. 687-696, 2005-12-00.
Abstract

The urban environmental factors generate conditions of oxidative stress in plants. Cellular antioxidants, such as ascorbic acid (AA),thiols (Ti), peroxidases (POD) and superoxide dismutase (SOD) are induced to different levels depending on their capacity to tolerate stressing conditions. In the first part of this study we determined the profile of these defenses in leaves of different ages of young plants of C. echinata. The levels of antioxidants were similar in all leaves analyzed, independently of the age. Secondly, we evaluated the same antioxidants and glutathione (GSH) in 130 young plants kept in a greenhouse with constant monitoring of temperature, relative humidity and irradiance during 18 months, in order to establish the seasonal variations occurring in response to climatic factors. During this period, leaf antioxidants were analyzed every three months. In general, AA concentrations and POD activity in C. echinata were higher than the levels reported for other tropical tree species. Seasonal variations were observed. GSH concentration and POD activity were significantly influenced by temperature and SOD by temperature and humidity. (AU)

FAPESP's process: 00/06422-4 - Caesalpinia echinata Lam. (Brazil-wood): from seed to wood, a model for studies on tropical Brazilian trees
Grantee:Rita de Cassia Leone Figueiredo Ribeiro
Support Opportunities: Research Projects - Thematic Grants