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营养液照光引起的化学变化及其对植物生长的影响

Chemical Changes Caused by LED Lamps in Nutrient Solution and Its Effect on Plant Growth
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摘要 水稻(Oryza sativa)根系照光实验表明,光的效应随循环水影响到不照光的植株,暗示营养液中发生了化学变化。在Si(K2Si O3)和Fe(Fe EDTA)组成的溶液模拟系统中,分别照射LED-紫光或阳光,观察到反应液的OD400值随光照时间的延长而增加。光照引起的化学变化发生在Fe EDTA和K2Si O3之间。化学变化只与光能量有关,与溶液温度无关,这是一种光化学反应。光化反应溶液的光吸收从OD360到OD560都有明显增高。LED-蓝光和阳光诱导产生的并含Fe EDTA-Si O3成分并能吸收光的二元螯合铁硅酸盐复合物附着在衬底膜上,形成三元复合物。衬底膜上可见大量的颗粒,其中有些是反光的微晶颗粒。除LED-蓝光和阳光外,LED-紫光、LED-红光和LED-红外光也能诱导产生光谱性质相同的螯合铁硅酸盐复合物。制备含螯合铁硅酸盐复合分子的溶液并进行植物生长实验,结果显示小球藻生长好,死亡的藻体分解褪色后留下的是褐色的蓬松团状铁-硅化物。经螯合铁硅酸盐复合物处理的水稻干重增加明显。 Rice plants were grown in nutrient solution containing Si/Fe EDTA 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, Fe EDTA) and Si(100 mg·L–1, K2 Si O3) 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 Fe EDTA and K2 Si O3. 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 Fe EDTA-Si O3 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 Fe EDTA-Si O3 complex. Chlorella beijerinch in the nutrient solution containing the Fe EDTA-Si O3 complex grew well; dead algae broke down and left a brown-coloured fluffy ball of Fe-Si complex. The rice plants fed the Fe EDTA- Si O3 complex showed high dry weight per plant.
出处 《植物学报》 CAS CSCD 北大核心 2016年第1期58-67,共10页 Chinese Bulletin of Botany
基金 国家自然科学基金(No.41271236) 上海市科委重点科技攻关(No.Y359Z3A721)
关键词 发光二极管 阳光 光化反应 螯合铁硅酸盐复合物 植物生长 LED sunlight photochemical reaction FeEDTA-SiO3 complex plant growth
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