Summary
The number of days to flowering and the number of flowers per plant were studied at 12, 13, 15 and 17 C night temperature in 79 F1 populations from 15 parents. Only a few F1 plants flowered earlier than their parents; the majority flowered at the same time, later or not at all. The number of flowers of the F1 plants was higher than that of the parents.
Genetic analyses showed a broad sense heritability of 70% for days to flowering and flower number and a highly significant GCA effect for days to flowering.
The progenies and parents that flowered early at one temperature were generally early at all temperatures.
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De Jong, J. Genetic analysis in Chrysanthemum morifolium. I. Flowering time and flower number at low and optimum temperature. Euphytica 33, 455–463 (1984). https://doi.org/10.1007/BF00021145
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DOI: https://doi.org/10.1007/BF00021145