Efeito de um extrato de algas nas actividades da nitrato redutase e da glutamina sintetase em oliveira (Olea europaea L.) Galega vulgar e Cobrançosa
2013
Capela, Rodrigo Rafael Guerreiro | Mota, Mariana Gomes
Mestrado em Engenharia Agronómica - Instituto Superior de Agronomia
Show more [+] Less [-]The present work was realized in the farm “da Choufarra”, located in Póvoa de Santarém and aimed to evaluate the effect of the application of a biostimulant based in seaweed extract on enzymatic activities of nitrate reductase and glutamine synthetase in the olive cultivars ‘Galega’ and ‘Cobrançosa’. This product is considered to improve nitrogen assimilation by increasing the activity of nitrate reductase, an enzyme that is involved in assimilation of nitric nitrogen. A single treatment with the double amount of the recommended dose of biostimulant was applied at full bloom. During flowering and fruit set, samples from young roots, young leaves and reproductive organs (flowers or young fruits) of treated trees and non treated trees were weekly harvested and we determine NR and GS activities. In relation to ‘Cobrançosa’, we verified beneficial effects of the product on GS activity in all the organs in last two harvest dates, and in NR activities more generally on leaves and reproductive organs. In ‘Galega’ we did not verify beneficial effects of the product in the enzymatic activities. The production tended to be superior in treated trees in both cultivars.
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