Genetical Studies of Gibberellic Acid Insensitivity in Rye (<em>Secale cereale</em> L.).

Genetic analysis of three semi-dwarf genotypes of rye (Secale cereale L.) -- &#39;Moskowskij Karlik&#39;, &#39;G&#252;lzow kurz&#39; and &#39;R 18&#39;, which were shown to be insensitive to applied gibberellic acid (GA3), has been carried out by using a seedling test. It could be demonstrated that all of the three genotypes are carrying recessive alleles for GA-insensitivity. Whereas the alleles of &#39;Moskowskij Karlik&#39; and &#39;R 18&#39; seem to have the same locus on chromosome 5R, the GA-insensitivity of &#39;G&#252;lzow kurz&#39; is governed by a different gene, most probably located on chromosome 7R. The relationship between the genes (alleles) for GA-insensitivity and semi-dwarfness, including the symbolization of the Gai-genes as well as their utilization in rye breeding is discussed. [ABSTRACT FROM AUTHOR]