QUNTITATIVE ION DISTRIBUTION WITHIN ROOT CELLS OF SALT-SENSITIVE AND SALT-TOLERANT MAIZE VARIETIES
Article first published online: 28 APR 2006
Volume 105, Issue 3, pages 367–379, March 1987
How to Cite
HAJIBAGHERI, M. A., HARVEY, D. M. R. and FLOWERS, T. J. (1987), QUNTITATIVE ION DISTRIBUTION WITHIN ROOT CELLS OF SALT-SENSITIVE AND SALT-TOLERANT MAIZE VARIETIES. New Phytologist, 105: 367–379. doi: 10.1111/j.1469-8137.1987.tb00874.x
- Issue published online: 28 APR 2006
- Article first published online: 28 APR 2006
- (Accepted 16 October 1986)
- Zea mays;
- root cortex;
- salinity resistance;
- X-ray microanalysis;
- subcellular compartments
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.