|Authors: ||S. Fukai, W. Zhang, M. Goi|
|Keywords: ||Dendranthema, flowering, photoperiod|
Effects of photoperiod and temperature on flowering in seven Dendranthema species (D. boreale, D. indicum, D. japonicum, D. occidentali-japonese var. ashizuriense, D. ornatum, D. pacificum, D. yoshinaganthum) and two chrysanthemums (D. grandiflorum cv.
Spring Song and Shuho-no-chikara) were investigated.
Day lengths of 10, 12 and 14 hours were applied in a growth chamber maintained at 25°C. All species flowered under day lengths of 10 and 12 hours while those under a 14-hour day length produced crown buds.
The number of days to flowering differed depending on the species.
Rooted cuttings of the species with and without 20 days storage at 4°C were grown under a natural inductive photoperiod in a greenhouse maintained of minimum 10, 15 or 20°C. Chrysanthemum (cv.
Spring Song) and D. indicum flowered under 10–20°C, D. japonicum and D. yoshinaganthum required minimum 15°C while other species required 20°C. The chilling treatment of cuttings enhanced or delayed flowering depending on the species.
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