INHERITANCE OF TEMPERATURE-INDUCED PSEUDOCOMPATIBILITY IN RYE

The differences between pseudocompatible seed produced by selfing self-incompatible plants of rye (Secale cereale L.) at high temperatures were investigated. The isozyme loci Prx7 and beta-Glu which are linked to the two self-incompatibility loci S and Z, were used as markers. Different alleles of S and Z strongly influenced the pseudocompatibility. For the locus S at 30-degrees-C a scale of varying efficiency of the S alleles was found. Furthermore, it proved possible to select one population with increased and one with decreased pseudocompatibility at high temperatures. The population with high pseudofertility was still incompatible under normal temperature conditions. Such selected material facilitates the production of inbred lines of self-incompatible rye material, which can be a useful tool in an efficient rye breeding programme.