The Effect of Isozyme Selection on Yield and Flowering Time in <em>Lolium perenne</em>.

A series of lines, differing in isozyme genotype, were constructed by selection, from within three cultivars of Lolium perenne. Field assessment of the progeny of these selected lines revealed variation in yield and timing of inflorescence emergence. This variation between lines from within a cultivar could not: be accounted for by the differing levels of homozygosity attained. In some instances differences in yield were associated with homozygosity for specific alleles at the PGI/2 locus, background genotype was however, of major importance. The variation identified could be attributable to founder effects or possible linkage of quantitative trait loci PGI/2 locus. [ABSTRACT FROM AUTHOR]