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首页> 外文期刊>Biochemistry >Ion-Exchange Properties of Cell Walls of Spinacia oleracea L.Roots under Different Environmental Salt Conditions
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Ion-Exchange Properties of Cell Walls of Spinacia oleracea L.Roots under Different Environmental Salt Conditions

机译：不同环境盐条件下菠菜根系细胞壁的离子交换特性

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Ion-exchange properties of the polymeric matrix of cell walls isolated from roots of 55-day-old Spinacia oleracea L.(Matador cv.)plants grown in nutrient solution in the presence of 0.5,150,and 250 mM NaCl and from roots of Suaeda altissima L.Pall plants of the same age grown in the presence of 0.5 and 250 mM NaCl were studied.The ion-exchange capacity of the spinach cell walls was determined at pH values from 2 to 12 and different ionic strength of the solution(10 and 250 mM NaCl).In the structure of the root cell walls,four types of ionogenic groups were found:amine,two types of carboxyl(the first being galacturonic acid residue),and phenolic groups.The content of each type of group and their ion-ization constants were evaluated.The ion-exchange properties of spinach and the halophyte Suaeda altissima L.Pall were compared,and the qualitative composition of the ion-exchange groups in the cell walls of roots of these plants appeared to be the same and not depend on conditions of the root nutrition.The content of carboxyl groups of polygalacturonic acid changed in the cell walls of the glycophyte and halophyte depending on the salt concentration in the medium.These changes in the composition of functional groups of the cell wall polymers seemed to be a response of these plants to salt and were more pronounced in the halophyte.A sharp increase in the NaCl concentration in the medium caused a decrease in pH in the extracellular water space as a result of exchange reactions between sodium ions entering from the external solution and protons of carboxyl groups of the cell walls.The findings are discussed from the standpoint of involvement of root cell walls of different plant species in response to salinity.
机译：从存在于0.5、150和250 mM NaCl的营养液中生长的55日龄菠菜（Matador cv。）植物的根中分离的细胞壁聚合物基质的离子交换特性研究了在0.5和250 mM NaCl存在下生长的同龄Suaeda altissima L.Pall植物。在2至12的pH值和溶液的不同离子强度下测定菠菜细胞壁的离子交换能力（在10和250 mM NaCl中）。在根细胞壁的结构中，发现了四种类型的离子源基团：胺，两种羧基（第一种是半乳糖醛酸残基）和酚基。每种类型基团的含量比较了菠菜和盐生植物Suaeda altissima L.Pall的离子交换特性，发现这些植物根系细胞壁中离子交换基团的定性组成为相同且不依赖于ro的条件在营养方面，聚半乳糖醛酸和盐生植物细胞壁中的聚半乳糖醛酸羧基含量随培养基中的盐浓度而变化，这些细胞壁聚合物官能团组成的变化似乎是这些反应的结果。从外部溶液进入的钠离子与羧基质子之间的交换反应导致培养基中NaCl浓度的急剧增加导致细胞外水空间的pH值降低，从而使植物盐分并在盐生植物中更为明显。从不同植物物种的根细胞壁参与盐分反应的角度讨论了这一发现。

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