Al avoidance and Al tolerance ofMucuna pruriens var.utilis: Effects of a heterogeneous root environment and the nitrogen form in the root environment |
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Authors: | K Hairiah I Stulen M van Noordwijk P J C Kuiper |
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Institution: | (1) Faculty of Agriculture, Brawijaya University, 64145 Malang, Indonesia;(2) Department of Plant Biology, P. O. Box 14, 9750 AA Haren (Gn), The Netherlands;(3) ICRAF c/o Forest Research and Development Center, Jalan Gunum Batu 5, P.O. Box 161, 16001 Bogor, Indonesia |
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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.Abbreviations Dr
root diameter
- Lpr
total root length per plant
- Lrw
specific root length
- NRA
nitrate reductase activity
- S/R
shoot: root ratio |
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Keywords: | Al avoidance Al tolerance ammonium Mucuna nitrate split-root |
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