, Volume 206, Issue 3, pp 649–656 | Cite as

Inheritance of the narrow leaf mutation in traditional Japanese evergreen azaleas

  • Keisuke Tasaki
  • Akira Nakatsuka
  • Kyeong-Seong Cheon
  • Nobuo Kobayashi


Morphological mutations have been admired and preserved in the classical cultivars of the Japanese evergreen azalea since the Edo era (1603–1867). One such mutation is the presence of narrow leaves and petals. In this study, we investigated the characteristics and inheritance patterns of the narrow leaf-type mutational form of Rhododendron macrosepalum ‘Seigaiha’, R. kaempferi ‘Kin-kujyaku’, and R. kiusianum Yanagi-ba mutant. The leaves of all cultivars showed weak development in the transverse plane and thickened margins. Subsequently, based on this qualitative character, the inheritance of the narrow leaf mutation was investigated. F1 seedlings of cross combinations between normal and narrow leaf-type plants had normal leaf-type. All F1 progenies of cross combinations between narrow leaf-type plants had narrow leaves like their parents. In addition, seedlings obtained from backcross and sib-cross tests using narrow leaf mutants segregated into normal and narrow leaf-types at a 1:1 and 3:1 ratio, respectively. These results indicate that the narrow leaf trait of three different azalea cultivars, ‘Seigaiha’, ‘Kin-kujyaku’, and R. kiusianum Yanagi-ba mutant, is probably a recessive mutation caused by a single, common gene.


Rhododendron Cultivar Choripetalous corolla Recessive Single gene mutation 



This study was supported by Grant-in-Aid for Scientific Research (KAKENHI Nos. 23241076 and 26292017) from Japan Society for the Promotion of Science (JSPS).


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Copyright information

© Springer Science+Business Media Dordrecht 2015

Authors and Affiliations

  • Keisuke Tasaki
    • 2
    • 3
  • Akira Nakatsuka
    • 1
  • Kyeong-Seong Cheon
    • 1
  • Nobuo Kobayashi
    • 1
  1. 1.Faculty of Life and Environmental SciencesShimane UniversityMatsueJapan
  2. 2.Department of Molecular and Functional Genomics, Center for Integrated Research in ScienceShimane UniversityMatsueJapan
  3. 3.Iwate Biotechnology Research CenterKitakamiJapan

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