[Objective]In order to study the effects of chromosome karyotype difference among different varieties of Marigold(Tagetes erecta L.).[Methods]Eight varieties of material treatments were as materials,which were'Rich yellow','Inca yellow','Discovery yellow','Discovery orange','Yellow moon of dream','Marvel golden',Marigold grandiflora,Chifeng Marigold'Yellow'.The karyotype formula,average arm length,relative length ratio of longest and shortest chromosomes,kar-yotype type,chromosome length composition,karyotype asymmetry coefficient and other karyotype parameters among different varieties were measured.[Results]The results showed that the karyotype asymmetry coefficients of the eight marigold varieties from large to small were Tagets erecta L.'Rich yellow'＞Tagets erecta L.'Inca yellow'＞Chifeng Marigold＞Tagets erecta L.'Discovery yellow'＞Tagets erecta L.'Yellow moon of dream'＞Tagets erecta L.'Discovery orange'＞Tagets erecta L.'Marvel golden'＞Marigold grandiflora,Therefore,the evolutionary order of 8 varieties of marigold can be concluded as follows:Marigold grandiflora,Tagets erecta L.'Discovery orange',Tagets erecta L.'Yellow moon of dream',Tagets erecta L.'Discovery yellow',Chifeng Marigold,Tagets erecta L.'Inca yellow',Tagets erecta L.'Rich yellow'.[Conclusion]It also proved that marigold may be a relatively evolved species of marigold genus.
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