Ocorrência de putrescina em folhas de milho, var. 'piranão' deficientes em pottásio
Palavras-chave:
deficiência de potássio, putrescina nas folhas, solução nutritiva, análise cromatográfica, acúmulo de aminasResumo
The purpose of this work was to study putrescine content of maize (Zea mays L. cv. “Piranão') grown in nutrient solutions.
Sample of 5 g of leaf material, taken from the middle third of intermediate leaves (excluding the midrib) when the plants were 79 days old, were used. The level of putrescine was determined chromatographically.
Plants were grown in the HOAGLAND and ARNON nutrient solution, with levels of potassium varied as folows: 0, 9.75, 97.5, 234.0, and 390.0 mg/l.
In the complete absence of potassium, there was a considerable accumulation of putrescine in the leaves. There was an increase in amine content of 52.50 times that of leaves from plants grown in the solution with an adequate level of potassium (234 mg/1 of solution).
The putrescine content of samples from plants receiving adequate potassium was 0.60umoles/g of material.
With 9.75 mg of potassium per liter of solution, the putrescine content fell abruptly, implying the need for related studies with smaller doses of potassium and agmatine determinations.
Referências
BLACK, C.A. Potassium. In BLACK, C.A. Soil plant relationships. 2. ed. New York, John Wiley Sons, 1968, p. 654-773.
BASSO, L.C. & SMITH, T.A. Effect of mineral deficiency on amine formation in higher plants. Phytochemistry 14(6):875-883. 1974.
CROCOMO, O.J. Recentes progressos em bioquímica de plantas. Ciência e Cultura. 26(2):128-137. 1974.
CROCOMO, O.J. & ROSSI, C. Determinação quantitativa de putrescina por cromatografia em papel de filtro. Anais da Esc. Supe. Agric. «Luiz de Queiroz» 24:131-136. 1967.
CROCOMO, O.J.; BASSO, L.C. & BRASIL, O.G. Formation of N-carbamil putrescina from citruline in Sesamum. Phytochemistry 9(7):1485-1487. 1970.
HOAGLAND, D.R. & ARNON, D.I. The water culture method for growing plants without soil. Calif. Agr. Exp. Sta., 1950. (Circ. 247).
RICHARDKS, F.J. & COLEMAN, R.G. Occurrence of putrescine in potassium deficient barley. Nature 1704324): 460. 1952.
SINCLAIR, C. The level and distribution of amines in barley as affected by potassium nutrition, arginine level, temperature fluctuation and mildew infection. Plant and Soil 30(3): 423-438. 1969. .
TAKAHASSHI, T. & YOSHIDA, D. Occurrence of putrescine in the tabaco plant with special reference to the nutrient deficiency. Soil an Plant Food 6: 93. 1960.
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