Abstract
The response to salt stress of 245 M 1 plant progenies derived from N-methyl- N-nitrosourea treatment of fertilized egg cells, was studied. On the average, 29% of the progenies showed variation for increased salt tolerance. Of a population of 15,000 M 2 seedlings, 1.3% were scored tolerant. The behavior of salt-tolerant variants was studied in the M 3 generation; two variants were categorized as tolerant and seven as intermediate in reaction. Root and shoot growth of variants showed differential inhibition under salt stress. Decrease in shoot and root growth was notably less in variants scored as tolerant than in the parent variety, Taichung 65. Mutagenesis of fertilized egg cells of rice seems to be an effective approach for inducing variability for salt tolerance.
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