众所周知,光的质量和强度对生长有主要影响,黄化,发芽,和许多植物的形态,但是关于波长和光强度对植物营养吸收的影响的信息有限。因此,这项研究是为了评估植物的生长,气孔形成,叶绿素指数,在六种光照处理下,普通豆类植物对宏观和微量营养素的吸收。实验设计是完全随机的,由六种处理组成:强蓝色(高光强度下的蓝色LED);弱蓝色(低光强度下的蓝色LED);强红色(高光强度下的红色LED);弱红色(低光强度下的红色LED;粉红色(组合红色蓝色LED),和白色(组合红色+白色led)。气孔密度(气孔mm-2);SPAD指数;植物高度(cm);根长(cm);植物干重(g);根干重(g);和N的浓度,S,K,Mg,Ca,B,Zn,Mn,叶片上的Fe分析受所有处理的影响。我们发现植物光形态发生不仅受波长控制,还有光的强度。在低强度的蓝光下,在豆类植物中观察到黄体化,但是当相同的波长具有更大的强度时,黄化没有发生,植物高度与多色光(粉红色和白色光)下的植物相同。最小的植物表现出最大的根,一些最高的叶绿素含量,和一些最高的气孔密度,因此,最高的干重,在白色LED下,表明高强度的多色光为植物固碳提供了更好的条件。蓝光对植物形态的影响是强度依赖性的。多色光下的植物往往有较低浓度的氮,K,Mg,和它们叶子中的铜,但是由于这些植物的干重较高,因此吸收的这些营养素的最终量较高。在高强度蓝光下的植物倾向于具有较低浓度的N,Cu,B,与低强度下的相同波长相比,它们的干重与在粉红色光下生长的植物没有什么不同。需要新的研究来了解强烈的蓝光如何以及在什么情况下可以替代植物生理学中的红光。
It is already known that light quality and intensity have major influences on the growth, etiolation, germination, and morphology of many plant species, but there is limited information about the effect of wavelength and light intensity on nutrient absorption by plants. Therefore, this study was established to evaluate the plant growth, stomata formation, chlorophyll index, and absorption of macro- and micronutrients by common bean plants under six light treatments. The experimental design was completely randomized and consisted of six treatments: strong blue (blue LED at high light intensity); weak blue (blue LED at low light intensity); strong red (red LED at high light intensity); weak red (red LED at low light intensity; pink (combined red + blue LED), and white (combined red + white led). The stomatal density (stomata mm-2); the SPAD index; plant height (cm); root length (cm); plant dry weight (g); root dry weight (g); and the concentrations of N, S, K, Mg, Ca, B, Zn, Mn, and Fe on leaf analysis were influenced by all treatments. We found that plant
photomorphogenesis is controlled not only by the wavelength, but also by the light intensity. Etiolation was observed in bean plants under blue light at low intensity, but when the same wavelength had more intensity, the etiolation did not happen, and the plant height was the same as plants under multichromatic lights (pink and white light). The smallest plants showed the largest roots, some of the highest chlorophyll contents, and some of the highest stomatal densities, and consequently, the highest dry weight, under white LED, showing that the multichromatic light at high intensity resulted in better conditions for the plants in carbon fixation. The effect of blue light on plant morphology is intensity-dependent. Plants under multichromatic light tend to have lower concentrations of N, K, Mg, and Cu in their leaves, but the final amount of these nutrients absorbed is higher because of the higher dry weight of these plants. Plants under blue light at high intensity tended to have lower concentrations of N, Cu, B, and Zn when compared to the same wavelength at low intensity, and their dry weight was not different from plants grown under pink light. New studies are needed to understand how and on what occasions intense blue light can replace red light in plant physiology.