The response of a genotype to the external application of gibberellic acid (GA) is an index of the level of endogenous gibberellin content (Ecklund and Moore, 1968). Radio-sensitivity of a genotype depends upon the changes in endogenous levels of auxin and ascorbic acid (Sparrow and Christensen, 1953). To find out the differences in radio-sensitivity, if any, of the two sub-species of Oryza, and to correlate with their response to the external application of GA, an experiment was conducted in two varieties of paddy viz., Ss and Taichung-65 belonging to indica and 'ponlai' groups respectively.
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Tamil Nadu Agricultural University
Coimbatore - 641 003
Tamil Nadu, India.
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