Summary
Four types of reaction of Chrysanthemum morifolium to infection by Puccinia horiana are described. (1) Resistant plants show no macroscopic lesions. Cultivars classified as resistant carry a single dominant gene mostly in a simplex, sometimes in a duplex condition. (2). Incomplete resistance provides good protection but under extreme test conditions some pustules develop slowly. (3) Necrosis inhibits spore formation to a large extent. The progenies of crosses between necrotic and susceptible cultivars are mostly susceptible. (4) Susceptible plants sporulate abundantly.
The merits of the three types of resistance are discussed.
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De Jong, J., Rademaker, W. The reaction of Chrysanthemum cultivars to Puccinia horiana and the inheritance of resistance. Euphytica 35, 945–952 (1986). https://doi.org/10.1007/BF00028604
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DOI: https://doi.org/10.1007/BF00028604