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

Author:
Brito, Diego de Mello Conde de, dos Santos, Carlos Diego, Gonçalves, Fabíola Vieira, Castro, Rosane Nora, de Souza, Sonia Regina
Source:
Journal of plant nutrition 2013 v.36 no.2 pp. 275-283
ISSN:
1532-4087
Subject:
Crambe abyssinica, Crambe crambe, germination, greenhouse production, hydroponics, metabolism, nitrate reductase, nitrates, nitrogen, phosphorus, potassium, vegetative growth
Abstract:
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.
Agid:
329166