Quantitative ion distribution within root cells of salt-sensitive and salt-tolerant maize varieties

Hajibagheri, M A, Harvey, D M R and Flowers, T J (1987) Quantitative ion distribution within root cells of salt-sensitive and salt-tolerant maize varieties. New Phytologist, 105 (3). pp. 367-379. ISSN 0028-646X

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Abstract

Significant varietal differences were apparent in the survival of seedlings of maize in saline conditions but only at relatively high external concentrations (200 mol m−3 NaCl), where there was a range from 0 to 66% survival, 25 d after salinization. For the varieties examined there was a strong negative correlation between Na concentrations in the third leaf and survival. Two resistant varieties (Across 8024 and Protador) and one salt-sensitive variety (LG11) were identified. The characteristics of ion accumulation were clearly different in salt-tolerant and salt-sensitive types, the difference becoming more pronounced with plant age.

The distribution of ions, particular those of Na, K and Cl, was determined within subcellular compartments of roots cells using X-ray microanalysis of freeze-substituted tissue. Salinity induced a greater increase (about 1.7 times) in cytoplasmic Na concentration in the salt-sensitive variety (LG11) than in resistant varieties (Across 8024 or Protador). The mean K:Na ratio in the cytoplasm of the root cortical cells in the salt-resistant varieties grown for 15 d in saline conditions (100 mol m−3 NaCl) was twice that found for LG11.

Sodium and Cl concentrations in the vacuoles decreased radially inwards from the epidermal cells in salt-treated roots of LG11.

Item Type: Article
Additional Information: Times Cited: 74 Hajibagheri, ma harvey, dmr flowers, tj
Schools and Departments: School of Life Sciences > Evolution, Behaviour and Environment
Subjects: Q Science
Depositing User: Catrina Hey
Date Deposited: 10 May 2012 08:06
Last Modified: 30 Nov 2012 17:12
URI: http://srodev.sussex.ac.uk/id/eprint/39151
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