Karyotype studies on Tagetes erecta L. and Tagetes patula L.
Karyotypes of nine Tagetes erecta L. accessions and three Tagetes patula L. accessions were studied. The chromosome numbers of T. erecta and T. patula were 2n=2x=24 and 2n=4x=48, respectively. The karyotype formulae of T. erecta L. ‘Scarletade’ and ‘Perfection Yellow’ are 2n=2x=24=4sm+20m; ‘9901AB’ and ‘Harvest’, 2n=2x=24=2sm+22m; ‘Taishan’, 2n=2x=24=14sm+10m; ‘Marvel’ and ‘Perfection Orange’, 2n=2x=24=24m. The karyotype formulae of T. patula L.: ‘GoldenGate’ and ‘Janie’ are
2n=4x=48=4sm+44m; ‘Little Hero’, 2n=4x=48=48m.
Key words: Tagetes erecta L., Tagetes patula L., chromosome, karyotype.