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Response of Different Rice Varieties to Gibberellin¹

The response to gibberellin of 119 rice (Oryza sativa L.) varieties, including some dwarf mutants, was studied. The japonica, indica and dwarf mutants showed a negative correlation between the lengths of their second leaf sheaths and their responses to gibberellin. No such correlation was obtained with the javanica varieties.

There was a negative relationship between gibberellin response and culm length. Some short varieties, however, showed a low response to gibberellin, indicating that lack of endogenous gibberellin is not the only factor responsible for dwarfness.

Key Words: Japonica, Indica, and Javanica rice • Dwarf rice • Bio-assay • Leaf sheath • Culm length

² Research fellow and Plant Physiologist, The International Rice Research Institute.

Received for publication September 22, 1970.