Published in Scientific Papers. Series B, Horticulture, Vol. LXVIII, Issue 2
Written by Elena DELIAN, Elena SĂVULESCU, Liliana BĂDULESCU, Monica Luminița BADEA
Global warming and the climate associated changes generally influence on plant phenology throughout their entire ontogenetic cycle (including autumn phenology), also having an impact on different ecological processes and on ecosystems. Stomata are specialized cellular structures located in the plant epidermis, which have a great importance for plant physiology, evolution, and global ecology. They are known especially for their role in carrying out the gases exchange, but their contribution to the maintenance of optimal leaf temperature, water, and nutrients uptake, as well as to assuring the continuity of their transport throughout the plant cannot be neglected This paper describes: 1) characteristics of stomata in mature leaves of some deciduous ornamental trees grown in the Botanical Garden of the University of Agronomic Sciences and Veterinary Medicine of Bucharest, Romania, 2) water use efficiency, quantum yield, and transpiration: stomatal conductance ratio, during autumn senescence. Both indicators’ categories can be promising to predict the autumn phenological shifts of the studied species driven under urban area conditions.
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