烟草科技2016，Vol.49Issue(12)：1-7,7.DOI:10.16135/j.issn1002-0861.2016.0252
硅对镉胁迫下烟草光合作用的影响
Effects of silicon on photosynthesis of tobacco under cadmium stress
摘要
Abstract
To study the effects of exogenous silicon on tobacco photosynthesis under cadmium stress, hydroponic experiments were conducted on Yunyan 87 with exogenous silicon in the form of potassium silicate (K2SiO3) and cadmium in the form of cadmium chloride (CdCl2·2.5H2O). KNO3 and HNO3 were used to control the effects of increased pH and K + of nutrient solution caused by potassium silicate, five treatments were set as follow: control, 0.05 mmol·L-1 Cd2+(Cd0.05), 0.10 mmol·L-1 Cd2+(Cd0.10), 0.05 mmol·L-1 Cd2++1.00 mmol·L-1 SiO2 (Cd0.05+Si), and 0.10 mmol·L-1 Cd2++1.00 mmol·L-1 SiO2 (Cd0.10+Si). The results showed that comparing with the control, Cd0.05 and Cd0.10 treatments significantly decreased the length, leaf area and biomass of tobacco plants, net photosynthetic rate was also significantly reduced by 52.02% and 73.75%, respectively. Exogenous silicon could alleviate the harmfulness of cadmium on the tobacco. Comparing with Cd0.05 and Cd0.10 treatments, Cd0.05+Si and Cd0.10+Si treatments increased the stomatal conductance of tobacco leaves by 259.90%and 13.29%; raised chlorophyll content by 43.47% and 92.33%; and promoted net photosynthetic rate by 99.90% and 72.78%, respectively. Exogenous silicon could promote the apparent quantum efficiency and carboxylation efficiency of tobacco under cadmium stress. Correlation analysis indicated that net photosynthetic rate significantly negatively correlated to the cadmium content in chloroplasts of tobacco, while silicon could reduce the cadmium content in chloroplasts, which was one of the underlying mechanisms that silicon increased the photosynthesis of tobacco under cadmium stress.关键词
烟草/镉胁迫/硅/光合作用Key words
Tobacco/Cadmium stress/Silicon/Photosynthesis分类
农业科技引用本文复制引用
郑明瑜,罗丽娟,李荟星,唐莉娜,陈星峰,李延..硅对镉胁迫下烟草光合作用的影响[J].烟草科技,2016,49(12):1-7,7.基金项目
中国烟草总公司福建省公司科研项目“硅对烤烟产量品质的影响及其施用技术研究”（闽烟合同［2013］63号）。 （）
