Chemical Changes Caused by LED Lamps in Nutrient Solution and Its Effect on Plant Growth
Online published: 2016-02-01
Rice plants were grown in nutrient solution containing Si/FeEDTA and LED light. Plants grown distant from the light source could get effect carried by the circulation of nutrient solution. The solution containing Fe (100 mg∙L-1, FeEDTA) and Si (100 mg∙L-1, K2SiO3) was illuminated separately by sunlight and LED-purple in the solution. The OD400 of the solution increased with each illuminating day. The chemical change induced by illumination occurred between FeEDTA and K2SiO3. This chemical change was not related to solution temperature (°C) but was related to illumination only, so this was a photochemical reaction. The illuminated solution resulted in light absorbance from OD360 to OD560. An FeEDTA-SiO3 complex was isolated from the solution illuminated by LED blue or sunlight. This complex was again absorbed by a lining membrane to form a three-component complex. There was a large amount of complex (e.g., microcrystals) accumulated on the lining membrane. LED-purple, LED-red and LED-infrared could be induced to result in the FeEDTA-SiO3 complex. Chlorella beijerinch in the nutrient solution containing the FeEDTA-SiO3 complex grew well; dead algae broke down and left a brown-coloured fluffy ball of Fe-Si complex. The rice plants fed the FeEDTA- SiO3 complex showed high dry weight per plant.
Key words: LED; sunlight; photochemical reaction; FeEDTA-SiO3 complex; plant growth
Jia Li, Jinxing Chen, Zhizheng Li . Chemical Changes Caused by LED Lamps in Nutrient Solution and Its Effect on Plant Growth[J]. Chinese Bulletin of Botany, 2016 , 51(1) : 58 -67 . DOI: 10.11983/CBB14211
1 | 龚颂福, 李止正 (1995). 立柱无土栽培研究初报. 应用与环境生物学报 2, 187-188. |
2 | 龚颂福, 李止正 (2002a). 花卉柱式无土栽培(CSC). 植物学通报 19, 477-483. |
3 | 龚颂福, 李止正 (2002b). 简易柱式无土栽培法. 应用与环境生物学报 8, 666-667. |
4 | 龚颂福, 李止正 (2003). 屋顶柱式无土栽培. 植物生理学通讯 39, 644-647. |
5 | 李止正, 陈金星 (2005). 水稻铁营养不足症状的发生及发光二极管增进铁营养方法. 中国, ZL200510024101.3. 2009- 07-29. |
6 | 李止正, 龚颂福 (2002a). 立柱和柱式无土栽培系统(SCSC)及其在生菜栽培上的应用. 应用与环境生物学报 8, 142-147. |
7 | 李止正, 龚颂福 (2002b). 番茄柱式无土栽培(CSC)研究. 应用与环境生物学报 8, 492-496. |
8 | 邹邦基 (1980). 植物生活中的硅. 植物生理学通讯 3, 14-20. |
/
〈 | 〉 |