Iris is the largest genus in the family Iridaceae and comprises about 300 species of perennial plants around the world with a cultivation history dating back to 2000 bc (Jeknić et al., 2014; Wilson, 2011; Zheng et al., 2017). It is widely used in landscaping because of its large, colorful, and novel flower (Lian et al., 2016). Up to now, there have been about 60,000 iris cultivars in the world. However, few of them bloom in the hot summer from the middle of July to the end of August (Luo et al., 2016). Iris dichotoma and Iris domestica are native to China, flower in the summer, and exhibit strong tolerance to drought, cold, and barren (Ruan et al., 2017). The newly purple-colored (RHS N82A) ornamental iris cultivar ‘Sweet Princess’ was selected in 2014 from the hybrids of I. dichotoma × I. domestica crossed in 2008. It exhibited attractive, big flowers and could bloom from the middle of July to the end of August in Shenyang City, Northeast China.
Bi, X.Y., Li, H., Lou, Q. & Zheng, Y. 2012 Studies on intergeneric compatibility of Iris dichotoma and Belamcanda chinensis and their hybrids identification Acta Hortic. Sin. 39 5 931 938
Jeknić, Z., Jeknić, S., Jevremović, S., Subotić, A. & Chen, T.H.H. 2014 Alteration of flower color in Iris germanica L. ‘Fire Bride’ through ectopic expression of phytoene synthase gene (crtB) from Pantoea agglomerans Plant Cell Rep. 33 1307 1321
Lian, X.Y., Luo, G.J., Li, H., Xu, W.J., Xiao, Y.E. & Bi, X.Y. 2016 Reciprocal difference of interspecific hybridization between three different colours of Iris dichotoma and I. domestica J. Hortic. Sci. Biotechnol. 91 5 1 8
Luo, G.J., Xiao, Y.E., Xu, W.J., Bi, X.Y., Li, H., Lian, X.Y., Yu, F.Y., Zheng, Y. & Lei, J.J. 2016 Studies on morphological variations and karyotypes of three Iris dichotoma accessions with different flower colors J Plant Genet. Resources 17 2 266 272
Ruan, L.L., Gao, Y.K., Wu, Q., Fu, M., Yang, Z.H. & Zhang, Q.X. 2017 An analysis of the genetic variation in ornamental traits in hybrids of Iris dichotoma and I. domestica Euphytica 213 8
Zheng, Y., Meng, T.F., Bi, X.Y. & Lei, J.J. 2017 Investigation and evaluation of wild Iris resources in Liaoning Province, China Genet. Resources Crop Evol. 64 5 967 978