Water stress response on the enzymatic activity in cowpea nodules
Braz. j. microbiol
;
32(3): 195-200, July-Sept., 2001. tab, graf
Artículo
en Inglés
| LILACS
| ID: lil-316968
ABSTRACT
A greenhouse experiment was carried out aiming to study the effect of water stress on metabolic activity of cowpea nodules at different plant development stages. Cowpea plants were grown in pots with yellow latosol soil under three different matric potentials treatments -7.0 (control-S1), -70.0 (S2) and <-85.0 KPa (S3). The experimental design was randomized blocks with sub-divided plots, each plot containing a different degree of water stress, divided in sub-plots for the four different developmental stages E1 (0-15), E2 (15-30), E3 (20-35) and E4 (30-45) days after emmergence. Water stress treatments were applied by monitoring soil water potential using a set of porous cups. The effect of water stress was most harmful to cowpea when it was applied at E2 than at other symbiotic process stages. Shoot/root ratio decreased from 2.61 to 2.14 when matric potential treatment was <-85.0 and -70.0 KPa respectively. There was a reduction in the glutamine synthetase activity and phosphoenolpyruvate carboxilase activity with increased stress, while glutamine synthase activity was the enzyme most sensitive to water stress. Glutamate dehydrogenase activity increased in more negative matric potential, indicating that this enzyme is sufficiently activitye under water stress.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Plantas
/
Técnicas In Vitro
/
Recursos Hídricos
/
Glutamato-Amoníaco Ligasa
/
Fijación del Nitrógeno
Tipo de estudio:
Ensayo Clínico Controlado
Idioma:
Inglés
Revista:
Braz. j. microbiol
Asunto de la revista:
Microbiologia
Año:
2001
Tipo del documento:
Artículo
País de afiliación:
Brasil
Institución/País de afiliación:
EMBRAPA/BR
/
EPEAL/BR
/
Universidade Rural de Pernambuco/BR
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