Comparison of the effects of different site of supply (root or foliar) of phosphate and nitrate on the growth and nitrate assimilation enzymes activity in milk thistle (Silybum marianum L.) plants
2005
Stanchevaa, I. | Geneva, M. | Georgiev, G. (Acad. M. Popov Institute of Plant Physiology, Bulgarian Academy of Sciences, Sofia (Bulgaria))
The milk thistle plants (Silybum marianum L.) were grown for 21 days under glasshouse conditions in a 0.8 L plastic pot (4 plants/pot) contained Hellriegel's solution in the growth medium. Increased P supply did not influence leaf number towards the control, but resulted in higher shoot dry weight. The plants with folliar fertilization had the lower leaf number towards the control but bigger rosette diameter, which suggests its larger leaf area. The plants grown with addition of foliar fertilizer showed the highest activities of the enzymes connected with primary N assimilation - nitrate reductase and glutamine synthetase. A correspondence between root N content and S:R dry weight ratio was found.
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