Publication Date
1985
Location
Kyoto Japan
Description
Although effects of Al toxicity on the growth of non-nodulated subterranean clover have been studied in controlled experiments in the presence of adequate mineral nitrogen, effects of Al toxicity on nodulation have not been examined critically. Two such experiments were conducted in solution cultures maintained at pH 4.5 and at a range of concentrations of monomeric Al, using an acid tolerant strain of R. trifolii as the inoculant. The first experiment, with cv. Bacchus Marsh, showed that the growth of tops and roots were significantly depressed only at Al concentrations > 24.2 µ,M. However; Rhizobium survival both in the nutrient solution and in the rhizosphere, and nodulation were markedly reduced at 6.4 µ,M Al. Nodulation was reduced to zero at 12.1 µ,M Al. In the second experiment, Al concentrations of 6.1 and 11.9 µ,M had no significant effect on top or root growth, but again markedly reduced nodulation in 12 other cvv. of subterranean clover. Al at 11. 9 µ,M reduced nodulation to zero in 5 cvv. Al at 6.1 and 11. 9 µ,M delayed nodulation in 10 cvv. and reduced the percentage of plants which formed nodules in 11 cvv. It is concluded that Rhizobium survival and nodulation are much more sensitive to Al in the root environment than is host plant growth.
Citation
Kim, Moo-Key; Asher, C J.; Edwards, D G.; and Date, R A., "Aluminum Toxicity: Effects on Growth and Nodulation of Subterranean Clover" (1985). IGC Proceedings (1985-2023). 23.
(URL: https://uknowledge.uky.edu/igc/1985/ses6/23)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Aluminum Toxicity: Effects on Growth and Nodulation of Subterranean Clover
Kyoto Japan
Although effects of Al toxicity on the growth of non-nodulated subterranean clover have been studied in controlled experiments in the presence of adequate mineral nitrogen, effects of Al toxicity on nodulation have not been examined critically. Two such experiments were conducted in solution cultures maintained at pH 4.5 and at a range of concentrations of monomeric Al, using an acid tolerant strain of R. trifolii as the inoculant. The first experiment, with cv. Bacchus Marsh, showed that the growth of tops and roots were significantly depressed only at Al concentrations > 24.2 µ,M. However; Rhizobium survival both in the nutrient solution and in the rhizosphere, and nodulation were markedly reduced at 6.4 µ,M Al. Nodulation was reduced to zero at 12.1 µ,M Al. In the second experiment, Al concentrations of 6.1 and 11.9 µ,M had no significant effect on top or root growth, but again markedly reduced nodulation in 12 other cvv. of subterranean clover. Al at 11. 9 µ,M reduced nodulation to zero in 5 cvv. Al at 6.1 and 11. 9 µ,M delayed nodulation in 10 cvv. and reduced the percentage of plants which formed nodules in 11 cvv. It is concluded that Rhizobium survival and nodulation are much more sensitive to Al in the root environment than is host plant growth.
