Ion-exchange properties of the cell walls isolated from suspension-cultured plant cells |
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Authors: | Nataly Meychik Yuliya Nikolaeva Maria Kushunina Maria Titova Alexander Nosov |
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Institution: | 1.Department of Plant Physiology, Faculty of Biology,Moscow State University,Moscow,Russia;2.Timiryazev Institute of Plant Physiology,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | Ion-exchange capacity of the cell walls isolated from suspension-cultured Panax japonicus, Polyscias filicifolia and Dioscorea deltoidea cells was analyzed at pH 2.8–12 and constant ionic strength (100 mM). The cell walls of all cultures contain three types of ion-exchange groups: primary amino groups (pK a < 3), carboxyl groups of polygalacturonic acid (pK a 3.71), and carboxyl groups of hydroxycinnamic acids (pK a 7.62). Amount of primary amino groups ranges from 500 (D. deltoidea) to 710 (P. japonicus) µmol/g cell wall dry weight, carboxyl groups with pK a 3.71—from 570 (D. deltoidea) to 670 (P. filicifolia), carboxyl groups with pK a 7.62—from 270 (P. filicifolia) to 370 (P. japonicus) µmol/g cell wall dry weight. The comparison of the data obtained by elemental and functional analyses demonstrated that the cell walls of all cultures are characterized by high content of pectins (~40% by weight) and structural proteins (~17–30% by weight), but do not contain phenolic OH–groups, which presumably signifies the absence of lignin in them. |
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