Abstract
Abstract The redbud (Cercis species) is a popular landscape small tree or shrub that is valued commercially for its early spring bloom and adaptability to a variety of environmental conditions. Despite its value to the nursery and landscape industies, large-scale production ofredbud has been limited, due in part to the difficulty of propagating clonal (cultivar) material. We screened 11 Cercis taxa for the ability of stem cuttings to regenerate adventitious roots using four growth regulator treatments: Dyna-Gro K-L-N, Woods Rooting Compound, Hormo-Root 2, and KIBA. Overall, C. chingii, C. glabra, and C. yunnanensis had the highest percentage of cuttings that produced roots. The Hormo-Root 2 treatment resulted in the highest rooting percentage over all taxa combined. C. chingii produced the most roots, while C. gigantea, C. siliquastrum, and C. yunnanensis produced the longest roots. Selected clones from this study will be used in our established Cercis breeding program to broaden the genetic base of cultivated Cercis and to produce redbuds with superior ornamental and disease resistance traits that are easier to propagate.
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