Gas exchange and antioxidant activity in seedlings of Copaifera langsdorffii Desf. under different water conditions
Título del documento: Gas exchange and antioxidant activity in seedlings of Copaifera langsdorffii Desf. under different water conditions
Revista: Anais da Academia Brasileira de Ciencias
Base de datos: PERIÓDICA
Número de sistema: 000417708
ISSN: 0001-3765
Autores: 1
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Instituciones: 1Universidade Federal da Grande Dourados, Faculdade de Ciencias Agrarias, Dourados, Mato Grosso do Sul. Brasil
Año:
Periodo: Dic
Volumen: 89
Número: 4
Paginación: 3039-3050
País: Brasil
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Experimental, aplicado
Resumen en inglés The aim of this study was to evaluate gas exchange, efficiency of the photosynthetic apparatus, and antioxidant activity in Copaifera langsdorffii Desf. The seedlings were cultivated under different conditions of water availability, in order to improve the utilization efficiency of available water resources. The seedlings were cultivated in four different water retention capacities (WRC- 25%, 50%, 75%, and 100%), and evaluated at four different time (T- 30, 60, 90, and 120 days). During the experimental period, seedlings presented the highest values for carboxylation efficiency of Rubisco (A/Ci), intrinsic water use efficiency (IWUE = A/gs), chlorophyll index, and stomatal opening, when grown in the substrate with 75% WRC, but the stomatal index (SI) was less the 25% WRC. The efficiency of photosystem II was not significantly altered by the treatments. Comparison between the extreme treatments in terms of water availability, represented by 25% and 100% WRC, represent stress conditions for the species. Water availability causes a high activity of antioxidant enzymes (superoxide dismutase, peroxidase, and catalase) in the plant
Disciplinas: Agrociencias,
Biología
Palabras clave: Angiospermas,
Fisiología vegetal,
Plántulas,
Estrés hídrico,
Intercambio gaseoso,
Actividad enzimática,
Enzimas antioxidantes,
Copaifera langsdorffii,
Fabaceae
Keyword: Angiosperms,
Plant physiology,
Seedlings,
Water stress,
Gas exchange,
Enzymatic activity,
Antioxidant enzymes,
Copaifera langsdorffii,
Fabaceae
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