The growth of rice plants in culture solution as influenced by aluminum concentrations
2000
Salim, M. (National Agricultural Research Centre, Islamabad (Pakistan))
Studies were carried out in a phytotron at 29/21 degree centigrade day/night temperature and 70% relative humidity to evaluate the influence of Al concentration on growth of rice plants in culture solution. Rice plants were grown in standard culture solution and in the solution with 30 or 90 ppm Al. Plants grown at high level of Al had short. swolen and stubby roots. Lateral roots were thick and lesser in number. Leaves showed yellowing and the tips and along the margins. Aluminum toxicity significantly reduced the plant height, number of tillers/per plant, root length and biomass of rice plant. The magnitude of reduction reflected the level of all in the culture solution and the prolonged stress period. Application of Al increased the N, Si, Zn and Al contents but decreased the total free sugars and P contents in the rice plants. Aluminum stress significantly reduced plant growth and biomass and caused various changes in the chemical composition of rice plant.
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