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Effects of nitrate supply on plant growth, nitrogen, phosphorus and potassium accumulation, and nitrate reductase activity in crambe

Brito, Diego de Mello Conde de, dos Santos, Carlos Diego, Gonçalves, Fabíola Vieira, Castro, Rosane Nora, de Souza, Sonia Regina
Journal of plant nutrition 2013 v.36 no.2 pp. 275-283
Crambe abyssinica, Crambe crambe, germination, greenhouse production, hydroponics, metabolism, nitrate reductase, nitrates, nitrogen, phosphorus, potassium, vegetative growth
The aim of this work was to evaluate the effects of variation in nitrate (NO₃⁻-N) supply on nitrogen (N), phosphorus (P), and potassium (K) values and several aspects of N metabolism in crambe (Crambe abyssinica). Crambe plants were submitted to crescent NO₃⁻-N doses (1.0; 2.5; 5.0 and 7.5 mM) under hydroponic culture in greenhouse and, at the end of vegetative stage (68 days after germination) harvest was performed. Increase in NO₃⁻-N supply caused a significant growth of it levels in stem, suggesting that this organ acts as a preferential storage site of this anion in crambe. Low P and high K values were observed in plants under 1.0 mM NO₃⁻-N. Whereas, with 7.5 mM was verified a decrease in NO₃⁻-N reductase activity and low N levels. At this dose, plants also exhibit other evidences of suppression in NO₃⁻-N reduction such as high amino-N levels.