Peterswald Tyson J, Mieog Jos C, Kretzschmar Tobias, Purdy Sarah J
New South Wales Department of Primary Industries and Regional Development, 105 Prince Street, Orange, NSW, 2800, Australia.
Southern Cross Plant Science, Southern Cross University, Military Rd, East Lismore, NSW, 2480, Australia.
Sci Rep. 2025 May 20;15(1):17435. doi: 10.1038/s41598-025-99771-6.
Far-red (FR) light elicits two distinct processes in plants. First, a shade avoidance response which is triggered when the ratio of red to FR (R: FR) declines. Second, it interacts synergistically with higher frequency wavelengths of light (e.g. red or white) which improves the efficiency of photosynthesis. We investigated whether we could harness these phenomena in medicinal Cannabis to improve yields so that the duration of the photoperiod could be reduced to 10 h ("10L") whilst returning similar or improved yields compared to a 12 h photoperiod ("12L"). The THC concentrations were elevated in both high THC varieties by the different FR treatments. In Hindu Kush the concentration of THC was elevated by the addition of 4 h of total FR ("10L_2_2D"), and in Northern Lights total cannabinoid yields were increased by nearly 70% over the 12 L control (0.43 versus 0.25 g Plant) by the addition of 2 h of FR in darkness after 10 h of light ("10L_2D"). Our results show a strong yield and quality advantage in high THC lines treated with end-of-day FR treatments. Furthermore, a lighting schedule of 10L_2D instead of 12 L would result in a saving of 5.5% in power usage and resultant emissions.
远红光（FR）在植物中引发两种不同的过程。第一，当红光与远红光的比例（R:FR）下降时触发的避荫反应。第二，它与较高频率的光波长（如红光或白光）协同作用，提高光合作用效率。我们研究了是否可以利用药用大麻中的这些现象来提高产量，以便将光周期的时长缩短至10小时（“10L”），同时与12小时光周期（“12L”）相比，实现相似或更高的产量。通过不同的远红光处理，两种高四氢大麻酚（THC）品种中的THC浓度均有所提高。在印度大麻中，通过添加4小时的总远红光（“10L_2_2D”），THC浓度升高；在北极光品种中，在光照10小时后于黑暗中添加2小时远红光（“10L_2D”），总大麻素产量比12L对照（0.43克/株对0.25克/株）增加了近70%。我们的结果表明，采用日终远红光处理的高THC品系具有显著的产量和品质优势。此外，采用10L_2D而非12L的光照时间表将节省5.5%的电力使用及相应排放。
