Nitrate influx in rose plants during day-night cycle |
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| Authors: | Raúl Cárdenas-Navarro Vilma del Carmen Castellanos-Morales Luis López-Pérez Juan José Peña-Cabriales Fidel Vargas-De la Cruz Idolina Flores-Cortez |
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| Institution: | 1. Instituto de Investigaciones Agropecuarias y Forestales, Universidad Michoacana de San Nicolás de Hidalgo, Tarímbaro, Mexico;2. Centro de Investigación y Estudios Avanzados, Instituto Politécnico Nacional, Irapuato, Mexico;3. Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Mexico |
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| Abstract: | In 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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| Keywords: | Nitrate uptake rose day-night |
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