ISSN:
1573-5036
Keywords:
Aluminium stress
;
Aluminium tolerance
;
Barley
;
Calcium
;
Magnesium
;
Meristem
;
Mitotic activity
;
Regeneration capacity
;
Root growth
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Two barley cultivars differing in Al tolerance, Kearney (Al-sensitive) and Dayton (Al-tolerant) were exposed to Al stress with varied Ca and Mg concentrations in the nutrient solution. Increase in calcium and magnesium supply protected root meristems and root growth from Al toxicity more effectively in the Al-tolerant cultivar than in the Al-sensitive one. Lateral roots were much more sensitive to Al than adventitious roots. Exposure to 0.33 mM Al with low concentrations of Ca (1.3 mM) and Mg (0.3 mM) caused damage to root tips in both cultivars. Increasing the Ca concentration to 4.3 and 6.3 mM prevented root tip damage in Dayton but not in Kearney. In the Al-tolerant cultivar Dayton, however, the root tips regenerated even at the low Ca concentration of 1.3 mM, whereas 6.3 mM Ca was necessary for this to occur in Kearney. This difference was due to the fact that Dayton's root meristem cells were more resistant to damage. Magnesium responses also varied between the two cultivars. At the lowest Ca concentration an increase in Mg to 6.3 mM permitted regeneration of damaged Kearney root tips and completely prevented any damage in Dayton. It is to be assumed that the different responses of the two cultivars are due to differences in plasma membrane properties.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02370153
Permalink
