Effect of end-of-day far-red light from a movable LED fixture on squash rootstock hypocotyl elongation
Effect of end-of-day far-red light from a movable LED fixture on squash rootstock hypocotyl elongation
复制标题
可移动 LED 装置发出的日终远红光对南瓜砧木下胚轴伸长的影响
DOI：
10.1016/j.scienta.2011.12.023
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发表时间：
2012
影响因子：
4.3
通讯作者：
M. Kacira
中科院分区：
文献类型：
--
作者：
Z. Yang;C. Kubota;P. Chia;M. Kacira
由于蔬菜嫁接需要足够的下胚轴长度，采用可移动和固定的灯具，研究了日末远红（EOD-FR）光对商品葫芦砧木下胚轴伸长的影响。以种间南瓜“Tetsukabuto”（Cucurbita maxima x Cucurbita moschata）幼苗为研究材料，在温室中进行了不同施用方法的每日EOD-FR光处理。在0 - 8.8mm−2d−1FR光照剂量范围内，幼苗下胚轴长度的响应用michaeli - menten型饱和曲线很好地描述了，正如我们之前报道的那样。使用接近饱和剂量的4.0mm - 2d - 1FR光，比较了可移动FR灯具与固定FR灯具对EOD-FR光治疗的效果。可移动的灯具是一个120厘米的金属棒，配有FR发光二极管（led），应用程序以两种不同的移动速度（0.78和3.13mm−1）进行测试，每天分别进行一次和四次重复应用，以达到相同的目标FR光剂量（4.0mm−2d−1）。无论移动速度如何，移动FR LED灯具下胚轴伸长程度与静止LED灯具下胚轴伸长程度在统计学上相同，比未处理的对照组大55-69%，这表明EOD-FR灯的应用可以灵活设计。据我们所知，这是第一篇展示使用移动灯具进行排爆光质量处理效果的论文。
Effects of end-of-day far-red (EOD-FR) light on hypocotyl elongation of a commercial cucurbit rootstock were investigated using movable and stationary light fixtures, since adequate hypocotyl length is required in vegetable grafting. Seedlings of an interspecific squash ‘Tetsukabuto’ (Cucurbita maxima x Cucurbita moschata) were grown in greenhouse and subject to daily EOD-FR light treatments with various application methods. The response of seedling hypocotyl length was well described using a Michaelis–Menten-type saturation curve over the range of 0–8.8mmolm−2d−1FR light doses, as we previously reported for tomato rootstocks. Using a near saturating dose of 4.0mmolm−2d−1FR light, efficacy of a movable FR light fixture for EOD-FR light treatment was compared with that of a stationary FR light fixture. The movable light fixture was a 120-cm metal bar equipped with FR light emitting diodes (LEDs) and the application was tested at two different traveling speeds (0.78 and 3.13mms−1) with one and four repeated applications per day, respectively, to reach the same target FR light dose (4.0mmolm−2d−1). Regardless of traveling speed, the extent of hypocotyl elongation under the moving FR LED fixture was statistically the same as that under stationary LED fixture and was 55–69% greater than non-treated control, suggesting that EOD-FR light applications can be designed flexibly. As far as we are aware, this is the first paper demonstrating the effect of EOD light quality treatment using moving light fixtures.