The present work had the objective of evaluating the residual effect of the herbicides in the physiologic quality and in the enzymatic activity in rice seeds. Four herbicides were tested (clomazone, quinclorac, propanil, byspiribac-sodium) in two application times and four rice cultivars (ARRANK, BRS-PELOTA, BR-IRGA 410 and BR-IRGA 417). To evaluate the physiologic quality of the seeds the germination test, cold test and electric conductivity were accomplished. For the enzymatic activity it was evaluated the following enzymes: esterase, glutamate oxaloacetate transaminase, malate dehydrogenase, glutamate dehydrogenase, phosphoglucose isomerase and the acid phosphatase. The herbicides of different mechanisms of action in post emergence application, can modify rice physiologic performance. The enzymatic expression varies as a function of the genotype and it is not dependent of the herbicide residual effect.
Oryza sativa; germination; enzymes
