Open AccessLamp Type and Irradiance Level for Daylength Extensions Influence Flowering of Campanula carpatica `Blue Clips', Coreopsis grandiflora `Early Sunrise', and Coreopsis verticillata `Moonbeam'
Author(s) -
Catherine M. Whitman,
Royal D. Heins,
A. Colin Cameron,
William H. Carlson
Publication year - 1998
Publication title -
journal of the american society for horticultural science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.408
H-Index - 80
eISSN - 2327-9788
pISSN - 0003-1062
DOI - 10.21273/jashs.123.5.802
Subject(s) - sunrise , botany , sodium vapor lamp , horticulture , biology , physics , meteorology , optics
The effectiveness of cool-white fluorescent, high-pressure sodium, incandescent, and metal halide lamps for inducing flowering through daylength extensions in Campanula carpatica Jacq. `Blue Clips', Coreopsis grandiflora Hogg ex Sweet `Early Sunrise', and Coreopsis verticillata L. `Moonbeam' was compared. Lighting was delivered as a 7-hour day extension with photosynthetic photon flux ( PPF ) ranging from 0.05 to 2.0 μmol·m -2 ·s -1 following a 9-hour natural daylength. Threshold irradiance values for flowering ranged from <0.05 to 0.4 μmol·m -2 ·s -1 , depending on species. Saturation irradiance values for Campanula carpatica `Blue Clips' and C. grandiflora `Early Sunrise' were between 0.2 ± 0.2 and 0.7 ± 0.5 μmol·m -2 ·s -1 , and did not differ between lamps. An irradiance of 1.0 μmol·m -2 ·s -1 from any lamp was adequate for flowering in Coreopsis verticillata `Moonbeam'. Time to flower at irradiances above the saturation points did not differ significantly between lamp types for all species tested. Campanula carpatica `Blue Clips' and Coreopsis grandiflora `Early Sunrise' plants had significantly longer stems under incandescent lamps than in any other treatment. Coreopsis verticillata `Moonbeam' plants grown under cool-white fluorescent lamps had stems ≈10% longer than those grown under high-pressure sodium or incandescent lamps.