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Salt tolerance in suaeda maritima fine structure and ion concentration in the apical region of roots



Salt tolerance in suaeda maritima fine structure and ion concentration in the apical region of roots



New Phytologist 99(3): 331-344



Anatomy and ion concentrations were studied in the roots of the halophyte S. maritima (L.) Dum. growing in saline and non-saline conditions. The roots were fine with only 3 layers of cortical cells. Salinization of the growth medium resulted in cellular vacuolation commencing closer to the apex than in non-salinized plants and led to an increase in root dimensions through increased cell (vacuole) size but not increased cell numbers: the Casparian strip developed much closer to the apex and was twice as long as salt-grown plants. Ion concentrations were determined in sections (1 mm) of root. The apical 1 mm was predominately non-vacuolate, with a K+ concentration greater than 100 mol m-3 and a Na:K ratio < 2, even when growing in 340 mol m-3 NaCl. The adaptive value of the anatomical observations are discussed and the ion concentration data assessed in relation to current concepts of the halophyte cell.

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Accession: 006361820

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