氧化石墨烯对高羊茅光合固碳特征的影响

Effects of graphene oxide on characteristics of photosynthetic carbon fixation in Festuca arundinacea Schreb

为了探究碳纳米材料对草坪植物光合固碳的影响,采用氧化石墨烯(GO)和高羊茅(Festuca arundinacea Schreb)为实验材料,通过向土壤中添加不同质量分数(1%、3%和5%)的GO进行高羊茅培植,分析了固碳相关指标,包括植物生长、光合参数、光合色素含量、糖含量、糖合成酶活性对GO的响应特征.结果表明:1%GO处理对高羊茅的光合固碳特征没有显著影响,而3%和5%处理显著抑制了植物生长,降低了光合参数、光合色素含量、糖含量和糖合成酶活性,且各指标随着GO质量分数的增加而降低.与对照组相比,5%GO处理下高羊茅的地下鲜重、净光合速率、蔗糖含量和蔗糖合成酶活性分别降低了57.9%、35.3%、56.5%和36.1%.由此可知,高浓度GO处理会显著抑制高羊茅的光合作用,阻碍植物生长,降低植物固碳能力.

In order to explore the effects of carbon nanomaterials on photosynthetic carbon fixation of turfgrass,graphene oxide(GO)and Festuca arundinacea Schreb were used as experimental materials,and F.arundinacea was cultivated in soil mixed with different mass fractions(1%,3%and 5%)of GO.The response characteristics of carbon fixation related indicators,inclu-ding plant growth,photosynthetic parameters,photosynthetic pigment content,sugar content and sugar synthase activity were analyzed.The results showed that 1%GO had no significant influence on carbon fixation characteristics of F.arundinacea.However,3%and 5%treatments significantly inhibited plant growth,reduced photosynthetic parameters,photosynthetic pig-ment content,sugar content and sugar synthetase activity,and each index decreased with the increase of mass fraction of GO.Compared with the control group,5%GO decreased underground fresh weight,net photosynthetic rate,sucrose content and sucrose synthase activity by 57.9%,35.3%,56.5%and 36.1%,respectively.Overall,high concentrations of GO can significantly inhibit photosynthesis,hinder plant growth,and reduce carbon fixation capacity of F.arundinacea.