RICE GENOTYPE TOLERANCE TO IRON IN NUTRIE NT SOLUTION

The objective of this study was to identify iron concentration and the plant most important character to study rice genotypes tolerance to i ron toxicity. A hydroponic culture experiment was carried out to evalu ate 20 rice genotypes and 10, 20, 40 and 80 mg L-1 of iron concentrati on. Growth characters evaluated were: root length, root, canopy and to tal dry matter, and plant height. The seedlings were grown for 10 days in nutrient solution and 20 mg L-1 of Fe was found to be ideal for su ch study. Total plant dry matter was the most adequate parameter for s uch study due to its higher relative contribution in genetic variation of the genotypes evaluated.