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

journal contribution
posted on 2023-06-08, 11:30 authored by M A Hajibagheri, D M R Harvey, Tim Flowers
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.

History

Publication status

  • Published

Journal

New Phytologist

ISSN

0028-646X

Publisher

Blackwell Publishing

Issue

3

Volume

105

Page range

367-379

Department affiliated with

  • Evolution, Behaviour and Environment Publications

Notes

Times Cited: 74 Hajibagheri, ma harvey, dmr flowers, tj

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2012-05-23

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