ISSN:
1573-5036
Keywords:
Aluminium
;
Caloium
;
Nodulation
;
pH Phosphate
;
Polymeric hydrolysis
;
Rhizobium
;
Rhizosphere
;
Root elongation
;
Root hairs
;
Trifolium repens
;
White clover
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Summary Effects of aluminium on theTrifolium repens var Huia-Rhizobium trifolii strain HP3 symbiosis were studied using an axenic solution-culture system. With, 10 μM phosphate, 50 μM aluminium reduced or inhibited root elongation at pH〈5.0, root hair formation at pH〈 5.0–5.5, and Rhizobium multiplication in the rhizosphere and nodule formation at pH〈6.0. In the absence of aluminium, root elongation and root hair formation were reduced at pH〈4.3, and Rhizobium multiplication and nodule formation were inhibited at pH〈5.0. Root hair formation was more sensitive to aluminium at pH〈5 than was root elongation. No effect of aluminium on Rhizobium multiplication and nodule formation at pH〈5 was detected because both were sensitive to pH alone. At pH 5.5 most of the aluminium changed immediately to a form which was susceptible to low-speed centrifugation, but which was detected by the aluminon method of analysis, and after 24 h a precipitate formed. the concentration of phosphate was reduced also, to approximately 1μM. Toxicity was overcome by either increasing the phosphate concentration from 10 to 50 μM, or by increasing the pH to 6.0 and the calcium, concentration to 1000μM.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02450371
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