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Quantitative ion distribution within root cells of salt-sensitive and salt-tolerant maize varieties
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posted on 2023-06-08, 11:32 authored by M A Hajibagheri, D M R Harvey, Tim FlowersSignificant 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.
History
Publication status
- Published
Journal
New PhytologistISSN
0028-646XPublisher
BlackwellIssue
3Volume
105Page range
367-379Department affiliated with
- Evolution, Behaviour and Environment Publications
Notes
Times Cited: 74 Hajibagheri, ma harvey, dmr flowers, tjFull text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2012-05-10Usage metrics
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