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  • Author or Editor: H.M. Donselman x
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Abstract

Ten species of tropical to temperate ornamental tree seedlings. [Bauhinia variegata L., Tabebuia heterophylla (DC.) Britton, T. caraiba (Mart.) Bur., Delonix regia (Bojer) Raf., Bursera simaruba (L.) Sarg., Pongamia pinnata (L.) Pierre, Jacaranda mimosifolia D. Don, Tamarindus indica L., Acer rubrum L., and Quercus virginiana Mill.] were grown outdoors under natural photoperiods or long day (LD) photoperiods during the autumn, winter, and early spring months. Growth response to photoperiod and temperature varied widely among both tropical and temperate species. Jacaranda mimosifolia, B. variegata, and T. indica were classified as quantitative LD plants since growth was enhanced by LD, but not prevented by short days. However, temperature appeared to be an overriding factor in the growth of T. indica. Delonix regia and A. rubrum grew continuously under LD, but ceased all growth when natural daylength (ND) became shorter than 10.8 h. Quercus virginiana, P. pinnata, B. simaruba, and T. heterophylla showed virtually no response to photoperiod, but temperatures below 15°C prevented growth in Q. virginiana. LD increased growth rate in T. caraiba during the autumn months, but low temperature prevented growth in either LD or ND in the winter. ND plants of this species grew more rapidly in the spring than those maintained under LD. This negative influence of LD on growth during the spring months also was noted in other species in this study.

Open Access