Varietal Differences in the Growth of Rice Plants in Response to Aluminum and Silicon

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Effects of Al (0-100 μM) and Si (0-2,000 μM) supplied singly or in combination on root growth of different rice varieties were examined under hydroponic conditions. Al addition inhibited root elongation of rice plants, and the inhibition increased with increasing amount of Al in the culture solution. Among 22 indiea varieties and among 8 japonica varieties tested, IAC3 and Nakateshin senbon were relatively tolerant to A1, respectively, whereas IR45 and Norin1 were relatively sensitive to Al, respectively. Si exerted a beneficial effect at all levels of Si treatment on indiea varieties, whereas Si supply resulted in a slight increase in the root dry weight of japonica varieties only at the highest level (2,000 μM Si). The alleviation of Al inhibition of rice root growth by Si was observed in the combination of Al and Si treatments. Alleviation was more pronounced for all the Si treatments in indiea varieties than in japonica varieties, and the alleviation was maximum with 2,000 μM Si in IR45. The varieties, and the alleviation was maximum with 2,000 μM Si in IR45. The in the Al-tolerant varieties. The application of Si resulted in an increase in the contents of Al and Si in plants, and there was no relationship between the Al eontent and Al inhibition in plants.
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