Changes in the size of the apparent surface area and adsorption energy of the rye roots by low pH and the presence of aluminium ions induced

Abstract

A b s t r a c t. The plant reactions on Al-stress include i.a. change of the surface area of the roots, which in the physicochemistry of plants characterizes the transport of water and ions through the root. The object of this study is the specific surface area of the roots of plants which are tolerant to aluminium, such as rye. Plants of rye were grown in a nutrient solution for 14 days at pH 4.5 in the presence of Al 3+ ions of concentration 10, 20, and 40 mg dm . The control plants were grown continuously at pH 7 or pH 4.5 without Al 3+. The apparent surface area and adsorption energy of the plants roots were determined from water vapour adsorption -desorption data. The apparent surface area of roots growing in the aluminium was (with respect to control) statistically significantly lower. There were no statistically significant differences in the apparent surface area of the roots which grew in pH 7, pH 4.5 without Al 3+. The average water vapour adsorption energy of the root surface, under stress conditions decreased. In the roots grown in the presence of Al +3

NCED expression is related to increased ABA biosynthesis and stomatal closure under aluminum stress

“…Al-induced reduction in gs is considered an indirect (long distance) effect of Al because it is nearly all retained in negatively charged pectin nets of root cells (Kopittke et al, 2015). Thus, Al toxicity results in lower root surface area (Panda et al, 2009;Szatanik-Kloc, 2016), reduction in water uptake, water deficiency in the shoot (Tamás et al, 2006;Yang et al, 2013) and low gs (Vitorello et al, 2005). However, most studies in which Al induced low gs (Simon et al, 1994;Jiang et al, 2008;Ali et al, 2011;Silva et al, 2012;Banhos et al, 2016;Silva et al, 2018;Cavalheiro et al, 2020) were conducted with plants growing directly on nutrient solution, where water is constantly available.…”