ISSN:
1573-5036
Keywords:
Al avoidance
;
Al tolerance
;
ammonium
;
Mucuna
;
nitrate
;
split-root
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract InMucuna pruriens var.utilis, grown with nitrate-N in a hydroponic split-root system, an Al avoidance reaction of root growth was observed, which was ascribed to local P stress in the Al containing compartment. The Al avoidance reaction was similar to the avoidance ofMucuna roots of acid subsoil in the field where roots grew preferentially in the topsoil. In the present paper the effect of different N forms (NO3 − and NH4 +) on the reactions ofMucuna to Al were studied, since in acid soils N is present as a mixture of NO3 − and NH4 +. No interaction between the N form and Al toxicity was found. A hydroponic split-root experiment with NH4NO3 nutrition, which is comparable to the situation in the field, showed that under these conditions Al avoidance did not occur. It is concluded that a relation between the Al avoidance reaction ofMucuna and P stress is still likely.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01587600
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