Gibberellin (GA) relationships in an induced dwarf mutant of barley, brachytic (gene symbol
br2) were investigated. The dwarf mutant was suggested to have genetic blockade at the site of conversion from a "pool GA" (presumably GA
19) to an "active GA" (presumably GA
3) in the pathway of GA biosynthesis. An application of (2-chloroethyl) trimethylammonium chloride (CCC), an inhibitor of GA biosynthesis, to the corresponding normal form (cv. Svanhals) reduced the growth and that of GA
3 to the dwarf mutant restored the reduced growth. In all possible hybrid combinations, among 3 dwarf genes,
uz, br and
br2, all F
1 hybrids showed tall normal plant height, thus the site of genetic blockade, if any, may be different one another within these 3 dwarf genes.
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