Garden and greenhouse chrysanthemums, Dendranthema x grandiflora, have a lengthy association with various world cultures. As a result, flower breeders have created numerous genotypes during the millennia of breeding this crop, which has enabled its establishment in the top ten cuts, potted flowering, and garden crops worldwide. The crop arises from multiple species; its allopolyploid nature (2n=6x=54) has complicated progress in crop development due to inbreeding depression, genetic load, and aneuploidy. Consequently, most cultivars are vegetatively propagated, few genes have been characterized, and none have been mapped to chromosomes. Research has focused on seed-propagated hybrids, flowering earliness, winter hardiness, improvement of flower colors/form, plant habit, day neutrality, characterization of self incompatibility, and selection of pseudo-self compatible parents. Future crop ideotypes are proposed to continue transformation of this important crop during the next millennium.
KeywordsFlower Color Winter Hardiness Disc Floret Plant Habit Chrysanthemum Morifolium
Unable to display preview. Download preview PDF.