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An analysis of the genetic variation in ornamental traits in hybrids of Iris dichotoma and I. domestica

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Abstract

Iris dichotoma and I. domestica were repeatedly crossed to obtain hybrids, a potentially new plant with high ornamental value. These hybrids are frequently selected for dwarf scaping, their large numbers of flowers, and their novel flower color; however selection is limited because of a lack of information between genotype and phenotypes. This study was aimed at characterizing the genetic differentiation of flower color among I. dichotoma, I. domestica, and four of their hybrids [F1, F2, backcrossing with I. domestica (BC1) as well as backcrossing with I. dichotoma (BC2)]. Seven phenotypic characteristics were analyzed: leaf width, leaf number, scape length, number of floral buds per stem, outer perianth length, inner perianth length, perianth color, and flower spots or veins. A high heritability estimate was obtained for scape length, which could be selected at early generations in individual plants, effectively shortening the breeding period. The correlation coefficient of outer and inner perianth lengths were high at 0.867, suggesting genetically linked traits. A high variation in flower color was found in F2s and BC1, hence novel color can be selected by repetitive self-crossing and BC1. These results are conducive to enhance the Iris breeding process and contribute to selection of individuals for lodging resistance, a large number of flowers, and novel flower color.

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Acknowledgements

This research was supported by the State Forestry Administration of the people’s Republic of China (948 Project), which named ‘the key parents and hybridizing in reblooming Irises and daylilies’ (2013-4-46). The ‘Graduate Training and Development Program’ of Beijing Municipal Commission of Education (BLCXY201627) also supported this research.

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Authors and Affiliations

  1. Beijing Forestry University, No. 35 Qinghua East Road, Haidian Dist, Beijing, China

    Lili Ruan, Yike Gao, Qi Wu, Mu Fu, Zhanhui Yang & Qixiang Zhang

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  1. Lili Ruan
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  2. Yike Gao
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  3. Qi Wu
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  4. Mu Fu
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  5. Zhanhui Yang
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  6. Qixiang Zhang
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Correspondence to Yike Gao.

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Ruan, L., Gao, Y., Wu, Q. et al. An analysis of the genetic variation in ornamental traits in hybrids of Iris dichotoma and I. domestica . Euphytica 213, 8 (2017). https://doi.org/10.1007/s10681-016-1797-9

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  • DOI: https://doi.org/10.1007/s10681-016-1797-9

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