Breeding for the heat resistant Rhododendrons, 5: Cross-compatibility and evaluation of breeding materials in section Rhododendron of subgenus Rhododendron with blue flower colours
1992
Arisumi, K. (Kagoshima Univ. (Japan). Faculty of Agriculture) | Nakamura, M. | Sakata, Y. | Matsuo, E.
In order to produce the "spurious evergreen azaleas" with heat resistance and blue flower colours, the cross-compatibility, seed germination and saddling growth of blue flowered species and cultivars in section Rhododendron were compared. In addition, their breeding potentials, with reference to heat resistance and other ornamental characteristics, were evaluated. A considerable number of species and cultivars were found to be unsuitable because of their lack of heat resistance and/or other characteristics. However, "Crater Lake", "Bob's Blue", "Sawayaka", "Beni-suzume", R. impeditum and R. telmateium were selected as promising materials, although their heat resistance was still much inferior to the evergreen azaleas. In 1990, "Purple Splendour" and R. eriocarpum were also included in the preliminary crosses. When used as pistillate parents, they produced seeds which failed to germinate. However, viable hybrid seedlings were produced using R. eriocarpum pollen on "Crater Lake". The need for further trials was indicated
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