INFLUENCE OF AEROBIOSIS AND HIPOXY IN THE ACTIVITY OF THE ENZYMES IN RICE SEEDLINGS
Abstract
The simulation of adverse environmental conditions and the monitoring of some key enzymes during the development of seedlings are able to orient the work of genetic improvement. Hence, this paper aims at: (a) detecting the presence of the enzyme alcohol dehydrogenase (ADH) in the seedling shoots developed under conditions of aerobiosis and of hipoxy; (b) relating the activities of the enzymes glutamate oxaloacetate transaminase (GOT) and malate dehydrogenase (MDH) to the availability of oxygen; and (c) comparing the growth of the seedling shoots with the activities of the enzymes studied. The treatments consisted of the temperatures of 20, 25 and 30oC under conditions of aerobiosis and of hipoxy, used during the germination and initial growth of seedlings of six genotypes of flooded rice. It was observed that the length of the seedling developed under aerobiosis at the temperatures of 25 and 30oC is superior than that of all other treatments. The enzyme ADH was only detected in seedlings developed under hipoxy and at temperatures higher than 20o C. The activity of the enzymes MDH and GOT in seedlings developed under either aerobiosis or hipoxy varies across temperatures. There is a higher level of activity of the enzyme GOT in seedlings of IRGA 417 and of the enzyme MDH in seedlings of IRGA 416, IRGA 417 and Bluebelle developed under aerobiosis than under hipoxy.
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