CO2浓度升高对凤梨叶片生长和光合特性的影响

Effects of Elevated CO2 Concentration on the Growth and Photosynthetic Characteristics in Guzmania 'Danis'

摘要:

研究了CO₂浓度升高对开顶式气室中凤梨叶片的生长与光合生理的影响。结果表明:高CO₂浓度(1000±100 μmol mol_-1)下生长的凤梨植株的株高、叶面积、鲜重和干重均高于对照(360±30 μmol mol_-1),处理90 d时分别为对照的120.19%、119.22%、177.91%和161.04%;凤梨叶片的净光合速率也增加了136%-259%,且促进了叶片中可溶性糖和淀粉的积累,但叶绿素含量则下降了33.91%。高CO₂浓度处理的凤梨叶片中RuBP羧化酶活性没有明显变化,乙醇酸氧化酶活性则明显下降。

Abstract:

Studies on the growth and photosynthetic characteristics in Guzmania‘Danis’ were conducted in plastic greenhouse with top covered by shading net under elevated CO₂ (1 000±100 μmol mol_-1) and ambient CO₂(360±30 μmol mol_-1) conditions. The results showed that the plant height, leaf area, fresh and dry weightsof plants under elevated CO₂ were 120.19%, 119.22%, 177.91% and 161.04% of those under ambient CO₂, respec-tively, as determined after 90 days of experiment. Under elevated CO₂ condition, the net photosynthetic rate increased to l36％-259％ and chlorophyll content decreased to 33.9l％ in comparison with those under ambient CO₂ during the experiments． Elevated CO₂ stimulated the accumulation of soluble sugar an d starch， but declined the activity of glycolate oxidase in leaves，however，the activity of RuBPCase increased only slightly.