Degree Name

Master of Science (MS)

Semester of Degree Completion

1990

Thesis Director

Janice Coons

Abstract

Phaseolus vulgaris (navy bean) and P. acutifolius (tepary bean) were grown hydroponically and stressed with -0.25 MPa NaCl for 9 days beginning 22 days after planting. Chloride and sodium distribution in leaves and roots as well as percent ion leakage as an indication of membrane integrity in leaves were determined. Chloride levels in NaCl treated plants were significantly higher than in controls. Chloride levels were not significantly different between plant parts or between plant species. Sodium distribution differed significantly between the roots of navy and tepary but not between the leaves of the two species. Navy root tissue contained twice as much sodium as the leaves, whereas, in tepary sodium concentrations were similar in leaves and roots. Significantly more sodium accumulated in NaCl treated plants than in controls. Percent ion leakage showed no notable trends among plant species or NaCl treatments, but a significant difference was observed between the two leaf ages.

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