Survey of Endogenous Gibberellins in Rice Lines Having Different Dwarfing Genes and in Autotetraploid Lines

Abstract

Thirteen dwarf lines of rice each with a known dwarfing gene were subjected to extraction of endogenous gibberellins (GAs). Six dwarf lines for which gene analysis is not yet done, were also tested for their GA content. The amounts of GAs estimated were compared with the data obtained previously. Tan-ginbozu (d-35(t)) was the only mutant that produced almost no GAs. Level of endogenous GAs in induced autotetraploid lines of two rice cultivars was compared with corresponding diploid plants in their seedling stage. Induced autotetraploid lines had about one seventh or one eighth of the corresponding diploid lines in GA content. The growth rate of seedlings was slower In induced autotetraploid plants.