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

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.

Año de publicación:

2013

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