Effect of two nutrient solution temperatures on nitrate uptake,nitrate reductase activity,NH4+ concentration and chlorophyll a fluorescence in rose plants |
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| Authors: | Ángeles Calatayud Elisa Gorbe Dolors Roca Pedro F. Martínez |
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| Affiliation: | 1. Weed Research Laboratory, Nanjing Agricultural University, Nanjing 210095, China;2. Bioenergetics Laboratory, University of Geneva, CH-1254 Jussy/Geneva, Switzerland;1. Institut National de la Recherche Agronomique (INRA), UMR1318, Institut Jean-Pierre Bourgin, Saclay Plant Sciences, RD10, F-78000 Versailles, France;2. AgroParisTech, Institut Jean-Pierre Bourgin, RD10, F-78000 Versailles, France;1. Key Laboratory of Sustainable Utilization of Soil Resources in the Commodity Grain Bases in Jilin Province/College of Resources and Environmental Sciences, Jilin Agricultural University, Changchun 130118, Jilin, China;2. Center for Resources, Environment and Food Security, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China;1. Institute of Horticulture, Lithuanian Research Centre for Agriculture and Forestry, Kaunas St. 30, LT-54333 Babtai, Kaunas District, Lithuania;2. Institute of Photonics and Nanotechnology, Vilnius University, Saul?tekio al. 3, LT-10257 Vilnius, Lithuania;1. State Key Laboratory of Genetic Engineering and Fudan Center for Genetic Diversity and Designing Agriculture, School of Life Sciences, Fudan University, Shanghai, China;2. Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, Fudan University, Shanghai, China |
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| Abstract: | The effect of two nutrient solution temperatures (cold (10 °C) and warm (22 °C)) during two flowering events of rose plants (Rosa × hybrida cv. Grand Gala) were examined by measuring chlorophyll (Chl) a fluorescence, ammonium (NH4+) content and nitrate reductase (NR) activity in four different leaf types, that is, external and internal leaves of bent shoots and lower and upper leaves of flowering stems. Besides, nitrate (NO3?) uptake and water absorption, total nitrogen (N) concentration in the plant, dry biomass, and the ratios of shoot/root and thin-white roots/suberized-brown roots were determined. Generally, cold solution increased NO3? uptake and thin-white roots production but decreased water uptake, so plants grown at cold solution had to improve their NO3? uptake mechanisms to obtain a higher amount of nutrient with less water absorption than plants grown at warm solution. The higher NO3? uptake can be related to an increase in NR activity, NH4+ content and total N concentration at cold solution. Nutrient solution temperature also had an effect on the photosynthetic apparatus. In general terms, the effective quantum yield (?PSII) and the fraction of open PSII reaction centres (qL) were higher in rose plants grown at cold solution. These effects can be associated to a higher NO3? uptake and total N concentration in the plants and were modulated by irradiance throughout all the experiment. Plants could adapt to cold solution by enhancing their metabolism without a decrease in total dry biomass. Nevertheless, the effect of nutrient solution temperature is not simple and also affected by climatic factors. |
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