Water stress response on the enzymatic activity in cowpea nodules
Braz. j. microbiol
;
32(3): 195-200, July-Sept., 2001. tab, graf
Article
in English
| 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.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Plants
/
In Vitro Techniques
/
Water Resources
/
Glutamate-Ammonia Ligase
/
Nitrogen Fixation
Type of study:
Controlled clinical trial
Language:
English
Journal:
Braz. j. microbiol
Journal subject:
Microbiology
Year:
2001
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
EMBRAPA/BR
/
EPEAL/BR
/
Universidade Rural de Pernambuco/BR
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