Photosynthetic capacity and water use efficiency in Ricinus communis (L.) under drought stress in semi-humid and semi-arid areas
Título del documento: Photosynthetic capacity and water use efficiency in Ricinus communis (L.) under drought stress in semi-humid and semi-arid areas
Revista: Anais da Academia Brasileira de Ciencias
Base de datos: PERIÓDICA
Número de sistema: 000417706
ISSN: 0001-3765
Autores: 1
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2
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Instituciones: 1Universidade Federal de Alagoas, Centro de Ciencias Agrarias, Rio Largo, Alagoas. Brasil
2Universidade Federal de Alagoas, Campus Arapiraca, Arapiraca, Alagoas. Brasil
Año:
Periodo: Dic
Volumen: 89
Número: 4
Paginación: 3015-3030
País: Brasil
Idioma: Inglés
Tipo de documento: Artículo
Enfoque: Experimental, aplicado
Resumen en inglés Castor bean is one of the crops with potential to provide raw material for production of oils for biodiesel. This species possess adaptive mechanisms for maintaining the water status when subjected to drought stress. A better understanding these mechanisms under field conditions can unravel the survival strategies used by this species. This study aimed to compare the physiological adaptations of Ricinus communis (L.) in two regions with different climates, the semi-arid and semi-humid subject to water stress. The plants showed greater vapor pressure deficit during the driest hours of the day, which contributed to higher values of the leaf temperature and leaf transpiration, however, the VPD(leaf-air) had the greatest effect on plants in the semi-arid region. In both regions, between 12:00 p.m. and 2:00 p.m., the plants presented reduction in the rates of photosynthesis and intracellular CO2 concentration in response to stomatal closure. During the dry season in the semi-arid region, photoinhibition occurred in the leaves of castor bean between 12:00 p.m. and 2:00 p.m. These results suggest that castor bean plants possess compensatory mechanisms for drought tolerance, such as: higher stomatal control and maintenance of photosynthetic capacity, allowing the plant to survive well in soil with low water availability
Disciplinas: Biología
Palabras clave: Fisiología vegetal,
Angiospermas,
Estrés hídrico,
Apertura estomática,
Fotoinhibición,
Ricinus communis,
Euphorbiaceae
Keyword: Plant physiology,
Angiosperms,
Water stress,
Stomatal aperture,
Photoinhibition,
Ricinus communis,
Euphorbiaceae
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