Gas exchange and antioxidant activity in seedlings of Copaifera langsdorffii Desf. under different water conditions
Document title: Gas exchange and antioxidant activity in seedlings of Copaifera langsdorffii Desf. under different water conditions
Journal: Anais da Academia Brasileira de Ciencias
Database: PERIÓDICA
System number: 000417708
ISSN: 0001-3765
Authors: 1
1
1
1
1
Institutions: 1Universidade Federal da Grande Dourados, Faculdade de Ciencias Agrarias, Dourados, Mato Grosso do Sul. Brasil
Year:
Season: Dic
Volumen: 89
Number: 4
Pages: 3039-3050
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental, aplicado
English abstract 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
Disciplines: Agrociencias,
Biología
Keyword: 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
Full text: Texto completo (Ver HTML)