Abstract

ABSTRACTIn herbaceous plants grown in controlled environmental conditions nitrate (NO3−) uptake increases during the day and decreases in the night. The aim of this work was to measure NO3− uptake rates along the day-night cycle, in rose (Rosa hybrida L.) plants grown under controlled environmental conditions. Two independent experiments were conducted inside a growth chamber at 20 ºC and 25 ºC, using rose mini-plants cv. Texas, grown in a hydroponic nutrient film technique (NFT) set-up with at 3.0 mol m−3 NO3− concentration. Dry matter and nitrogen (N) accumulation were registered during growth and NO3− uptake rates were measured during a day-night cycle, using 15N as 15NO3−. In both experiments the hourly estimated N-NO3− accumulation rates are near to the measured uptake rates of 15NO3− and nitrate uptake decrease during the day and increase in the night, in contrast with the herbaceous plants. Results are discussed on the basis of N plant demand and carbohydrates availability.

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