Temperature and Irradiance Influence Growth and Development of Three Cultivars of Achimenes

in HortScience
Author: J.C. Vlahos1
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  • 1 Department of Horticulture, Agricultural University, P.O. Box 30, 6700 AA Wageningen, The Netherlands

Three cultivars of Achimenes, `Flamenco', `Hilda', and `Rosenelfe', were grown for 10 weeks in nine environments: 17, 21, and 25C combined with 8, 16, or 24 hours of irradiance (213 μmol·s-1·m-2). Increase in temperature increased plant height, number of nodes, number of flowers, and shortened time to anthesis. Number of axillary shoots was enhanced at 17C. Increasing duration of illumination increased shoot dry weight and reduced plant height; a 16-hour light duration compared to 8 or 24 hours increased size and fresh and dry weight of rhizomes. `Rosenelfe' responded differently from `Flamenco' and `Hilda' to the environmental treatments. Depending on cultivar, top growth and flowering were influenced by temperature and duration of illumination, whereas rhizome growth was affected mainly by the latter.

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