Studies on the Karyotype and Chromosome Variation of Regenerated Perennial Ryegrass
- Received Date: 2004-10-10
Abstract: The chromosome karyotypes and the chromosome variation of regenerated plants of perennial ryegrass(Lolium perenne L.)were studied. The results showed that perennial ryegrass was diploid and composed of metacentric chromosomes and submetacentric chromosomes and belonged to "1A" type. Its karyotypical formula was 2n=2x=14=2sm+12m(2SAT). It was also found that the chromosome amount changes happened in 40% of regenerated plants cells and there were also obvious chromosome structure variations (fragment,dicentrics,condensation and transposed ring etc.), mitotic aberrations (lagging chromosome, bridges) as well as numerical alterations (including haploid,aneuploid and polyploid etc.)in some cells of regenerated plants.