Regulating Flowering and Extension Growth of Poinsettia Using Red and Far-red Light-emitting Diodes for End-of-day Lighting
Regulating Flowering and Extension Growth of Poinsettia Using Red and Far-red Light-emitting Diodes for End-of-day Lighting
复制标题
使用红色和远红发光二极管进行日终照明调节一品红的开花和延伸生长
DOI：
10.21273/hortsci13630-18
复制
发表时间：
2019
期刊：
影响因子：
1.9
通讯作者：
E. Runkle
中科院分区：
文献类型：
--
作者：
Mengzi Zhang;E. Runkle
光质调控是观赏作物生产中调节株高的一种潜在的替代方法。特别是，高的红光（R; 600-700 nm）与远红光（FR; 700-800 nm）的比率（R：FR）的一天结束（EOD）照明可以抑制延伸生长，而低的R：FR可以促进it. We调查的R：FR和EOD照明的持续时间在调节两个一品红品种，白色闪光和大理石星星的延伸生长和开花的效果。植物在20 °C下在9小时天下生长，有或没有由两种类型的发光二极管灯泡提供的EOD照明：R+白色+FR（随后称为R+FR）和仅FR。R：FR比分别为0.73和0.04，植物冠层400至800 nm之间的光子通量密度调整为2至3 μmol·m-2·s-1。6种EOD光照处理分别为R+FR或FR 2或4小时，R+FR 2小时后FR 2小时，R +FR 4小时后FR 2小时。我们还研究了第二次重复中4小时中等强度（13 μmol·m−2·s-1）EOD FR处理的影响。EOD光照普遍增加一品红的延伸生长，光照时间最长时促进作用最大。除2 h R+FR + 2 h FR和4 h FR处理外，9 h延长2 h后，4 h和6 h EOD处理的第一苞片颜色和开花天数无差异，但开花延迟。四个小时的中等强度EOD FR大大促进了扩展生长和延迟或防止两个品种的苞片着色。我们的结论是，EOD照明促进一品红的延伸生长，特别是，EOD FR在低强度（2-3 μmol·m-2·s-1）不被视为长日照信号，而较高强度（13 μmol·m-2·s-1）的FR延迟开花。
Manipulating light quality is a potential alternative method of regulating plant height in the commercial production of ornamental crops. In particular, end-of-day (EOD) lighting with a high red (R; 600–700 nm) to far-red (FR; 700–800 nm) ratio (R:FR) can suppress extension growth, whereas a low R:FR can promote it. We investigated the effects of the R:FR and duration of EOD lighting in regulating extension growth and flowering of two poinsettia cultivars, White Glitter and Marble Star. Plants were grown at 20 °C under 9-hour days with or without EOD lighting provided by two types of light-emitting diode bulbs: R+white+FR (subsequently referred to as R+FR) and FR only. The R:FR ratios were 0.73 and 0.04, respectively, and the photon flux density between 400 and 800 nm was adjusted to 2 to 3 μmol·m−2·s–1 at plant canopy. The six EOD lighting treatments were R+FR or FR for 2 or 4 hours, 2 hours of R+FR followed by 2 hours of FR, and 4 hours of R+FR followed by 2 hours of FR. We also investigated the impact of a 4-hour moderate-intensity (13 μmol·m−2·s–1) EOD FR treatment in the second replication. EOD lighting generally increased poinsettia extension growth, with the greatest promotion under the longest lighting periods. There were no differences in days to first bract color and days to anthesis when the 9-hour day was extended by 2 hours, but flowering was delayed under 4- or 6-hour EOD treatments, except for the 2-hour R+FR + 2-hour FR and 4-hour FR treatments. Four hours of moderate-intensity EOD FR greatly promoted extension growth and delayed or prevented bract coloration in both cultivars. We conclude that EOD lighting promotes extension growth of poinsettia, and specifically, EOD FR at a low intensity (2–3 μmol·m−2·s–1) is not perceived as long-day signal, whereas a higher intensity (13 μmol·m−2·s–1) of FR delays flowering.