It has been shown that the decrease in flowering of Tagetes patula L. and Calendula officinales L. under conditions of environmental pollution due to motor-car exhaust fumes results in a reduction of non-structural carbohydrates in stem apices, floral meristems and apical buds. This might be one of the reasons for reduced flowering intensity. A comparison of the results showed that the negative effect of pollutants on non-structural carbohydrates in generative organs was greater in Calendula officinales L. than in Tagetes patula L.
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Bessonova, V.P., Priymak, O.P. (2008). The Influence Of Motor-Car Exhaust On The Content Of Non-Structural Carbohydrates In Stem Apices, Floral Meristems And Apical Buds Of Tagetes Patula L. And Calendula Officinales L. . In: Barnes, I., Kharytonov, M.M. (eds) Simulation and Assessment of Chemical Processes in a Multiphase Environment. NATO Science for Peace and Security Series C: Environmental Security. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-8846-9_28
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