不同LED光质对烟草生长及养分积累的影响

Effects of Different LED Light Qualities on Tobacco Growth and Nutrient Accumulation

为探究不同光质作为烟草生长光源的应用效果,在人工气候室条件下,以本生烟草为试验材料,设置3种不同光质光源LED-v1(R1.2/B1,R3.4/FR1)、LED-v2(R7.4/B1,R2.9/FR1)、LED-v1/v2(R2.3/B1,R3.1/FR1)处理,分析烟草的生长指标对不同光质的响应。结果表明:LED-v1/v2处理本生烟草的株高、茎粗、叶面积、叶片数、生物量显著优于其他处理。低R/FR和低R/B光质能提高烟草叶片的含N量,有助于合成有机物及提高抗逆性,提高烟草的经济品质。适当降低LED-v1/v2光质R/B和R/FR值更有利于烟草的生长和品质的提升。光合反应中心Ⅱ(ΦPSⅡ)、表观电子传递速率(ETR)、PSⅡ最大光化学量子产量(Fv/Fm)等叶绿素荧光指标在不同的处理间无显著差异。综上,烟草生长最适合的人工光源为LED-v1/v2(R2.3/B1,R3.1/FR1)。

In order to explore the application effect of different light quality as the light source of tobacco growth,by taking Nicotiana benthamiana as the experimental material under the condition of artificial climate chamber,three light sources with different light quality,including LED-v1(R1.2/B1,R3.4/FR1),LED-v2(R7.4/B1,R2.9/FR1),and LED-v1/v2(R2.3/B1,R3.1/FR1),were set up to analyze the response of tobacco growth indicators to different light quality.The results showed that the plant height,stem thick,leaf area,blade number and biomass of Nicotiana benthamiana treated with LED-v1/v2 were significantly better than those of other treatments.Low R/FR and low R/B light quality could increase the N content in the leaves of tobacco,help to synthesize the organic matters and improve the stress resistance,and also improve the economic quality of tobacco.Appropriately reducing the R/B and R/FR values of LED-v1/v2 light quality was more conducive to the growth of f tobacco and its quality improvement.There was no significant difference in the chlorophyll fluorescence parameters such as photosynthetic reaction centreⅡ(ΦPSⅡ),apparent electron transport rate(ETR),PSⅡmaximal photochemical efficiency(Fv/Fm)among different treatments.In summary,the most suitable artificial light source for the growth of tobacco was LED-v1/v2(R2.3/B1,R3.1/FR1).