【摘要】 为进一步探讨硅对水稻生长发育的影响,试验以"农大19号"水稻为材料,测定了不同浓度的硅对水稻叶片的叶绿素含量、过氧化物酶(POD)活性、净光合速率(Pn)、气孔导度(Gs)、胞间CO2浓度(Ci)和水稻叶片表面的超微结构及水稻叶片表面硅元素含量的影响。结果表明:水稻施用硅后,叶绿素含量、气孔导度和净光合速率提高,叶片光合作用增强;施用硅有利于叶片表面形成硅化细胞,提高叶片表面硅元素含量,增强叶片光合作用。但是,硅浓度过大反而降低叶绿素含量和净光合速率。试验发现施用质量浓度为80 mg/L的二氧化硅水溶胶时,效果最佳。更多还原

【Abstract】 To further investigate nano-silicon on rice growth,using "nongda 19" as material,by spraying nano-silicon and sodium silicate,the chlorophyll content of rice leaves,peroxidase(POD) activity,net photosynthetic rate(Pn),stomatal conductance(Gs) and intercellular CO2 concentration(Ci) were measured.Simultaneously,surface ultrastructure of rice leaves and Si element content of rice leaf surface were determined and analyzed.The results indicate that application of silicon to rice can increase chlorophyll content,stomatal conductance and net photosynthetic rate,thereby enhance the photosynthesis of leaves;Application of silicon to rice can be conducive to formation of silicified leaf cells and enhance the content of silicon on leaf surface and leaf photosynthesis,but too large silicon will reduce chlorophyll content and net photosynthetic rate.Through comparing between concentration of SiO2 hydrosol and sodium silicate,application concentration of 80 mg/L of SiO2 hydrosol was found to be the best result.更多还原