Effects of fruiting on the growth of Arabica coffee trees as related to carbohydrate and nitrogen status and to nitrate reductase activity
The effects of fruiting on the vegetative growth, carbohydrate and N content, and nitrate reductase activity of 8-year-old Coffea arabica cv. Red Catuai trees supplied with N-NO3 or urea were monitored in a field experiment conducted in Brazil during the 1997-88 growing season. Branch growth rate and leaf area increase were higher in de-fruited compared to fruiting trees. Starch content fluctuated in both the leaves and roots but the levels were always higher in de-fruited compared to fruiting trees. The presence or absence of fruits did not affect the total soluble sugar content in both leaves and roots. Nitrate reductase activity was higher in the slow growing, fruiting trees compared to the faster growing, de-fruited trees, with the enzyme activity being higher in leaves than in roots. N-NO3 content was not affected by fruiting while amino-N was higher in de-fruited compared to fruiting trees.
| Main Authors: | , , |
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| Format: | biblioteca |
| Published: |
2001
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| Subjects: | COFFEA, COFFEA ARABICA, RAMAS, CARBOHIDRATOS, COMPOSICION QUIMICA, CAFE, ACTIVIDAD ENZIMATICA, ENZIMAS, FRUTAS, CRECIMIENTO, INDICE DE SUPERFICIE FOLIAR, HOJAS, NITRATO REDUCTASA, NITROGENO, CONTENIDO DE NITROGENO, RAICES, ALMIDON, AZUCARES, |
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