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Effect of zinc application on tryptophan synthesis, total amino acids and total soluble proteins of leaves of coffee seedlings Efeito da aplicacao de zinco via foliar na sintese de triptofano, aminoacidos e proteinas soluveis em mudas de cafeeiro

by Malta, M.R; Furtini Neto, A.E; Alves, J.D; Guimaraes, P.T.G.
Publisher: 2002ISSN: 1677-0420.Subject(s): COFFEA | COFFEA ARABICA | AMINOACIDOS | CAFE | HOJAS | NUTRICION DE LAS PLANTAS | PROTEINAS VEGETALES | PLANTULAS | OLIGOELEMENTOS | TRIPTOFANO | CINC | COFFEA | COFFEA ARABICA | AMINO ACIDS | COFFEE | LEAVES | PLANT NUTRITION | PLANT PROTEIN | SEEDLINGS | TRACE ELEMENTS | TRYPTOPHAN | ZINC | COFFEA | COFFEA ARABICA | ACIDE AMINE | CAFE | FEUILLE | NUTRITION DES PLANTES | PROTEINE VEGETALE | PLANTULE | OLIGOELEMENT | TRYPTOPHANE | ZINC In: Brazilian Journal of Plant Physiology (Brasil) v. 14(1) p. 31-37Summary: The effects of Zn application on tryptophan synthesis, total amino acids and total soluble proteins of leaves of coffee (Coffea arabica) seedlings, grown in nutrient solution without Zn for four months, were examined. The plants were sprayed with 0.6 percent ZnSO4.7H2O in three different regions (basal: 6 pairs of lower leaves; apical: 6 pairs of upper leaves; and plagiotropic branches). The plants were harvested 0 (control), 12, 24, 48 or 72 h after application of Zn. The leaves were then separated into lots taken from the basal as well as from the plagiotropic branches. These were analysed for tryptophan concentration, total amino acids and total soluble proteins. A reduction in the tryptophan concentration was observed following Zn application together with an increase in the concentration of total amino acids and total soluble proteins.
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The effects of Zn application on tryptophan synthesis, total amino acids and total soluble proteins of leaves of coffee (Coffea arabica) seedlings, grown in nutrient solution without Zn for four months, were examined. The plants were sprayed with 0.6 percent ZnSO4.7H2O in three different regions (basal: 6 pairs of lower leaves; apical: 6 pairs of upper leaves; and plagiotropic branches). The plants were harvested 0 (control), 12, 24, 48 or 72 h after application of Zn. The leaves were then separated into lots taken from the basal as well as from the plagiotropic branches. These were analysed for tryptophan concentration, total amino acids and total soluble proteins. A reduction in the tryptophan concentration was observed following Zn application together with an increase in the concentration of total amino acids and total soluble proteins.

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