短期CO_2加富对苗期红掌生长及光合作用的影响

Effects of Short-term CO_2 Enrichment on Photosynthetic Rate and Growth in Anthurium andraeanum L.Seedlings

以开顶式塑料薄膜温室为设施,研究了红掌叶片净光合速率、株高和光合酶活性等指标对短期CO2加富的响应.结果表明,处理30 d时,处理组T1(CO2浓度,(700±100)μmol.mol-1)的株高,单叶面积,干重/鲜重分别比对照组(CO2浓度,(360±30)μmol.mol-1)增加了4.28%,5.70%,15.84%,而处理组T2(CO2浓度,(1 000±100)μmol.mol-1)的株高,单叶面积,干重/鲜重分别比对照增加了6.16%,5.18%,9.95%;在各自生长环境下处理组T1,T2的净光合速率分别比对照增加24.47%,32.49%,且在大气CO2浓度下测定的净光合速率处理组也均高于对照,处理组气孔导度与蒸腾速率下降,促进了叶片中可溶性糖和淀粉积累,叶绿素含量并没有明显变化,Ru-bisco活性增加,乙醇酸氧化酶活性则明显下降.

The effects of CO2 enrichment on photosynthetic characteristics and growth rate of Anthurium andraeartum L. were studied in open-top plastic chambers. The results showed that the plant height, leaf area and dry weight/fresh weight of plants grown under T1 treatment （700 ± 100）μmol·mol^-1） for 30 d in- creased by 4.28%, 5.70% and 15.84% respectively in comparison with those of plants grown under ambient [ CO2 ] （CK, （360±30） μmol·mol^-1 ） , There are 6.16 %, 5.18 %, 9.95 % increment respectively for T2 treatment（ 1 000±100μmol·mol^-1 ） . However, the net photosynthetic rate of plants for T1, T2 treatment under individual growth conditions at that period were 24.47 % and 32.49 % higher respectively than those in grown under ambient [ CO2 ]. The Pn in TI, T2 plants under ambient [ CO2 ] were higher than that for control plants. CO2 enrichment caused a marked rise in soluble sugar and starch accumulation in leaves, but significantly reduced their stomata conductance and transpiratory rate. Though the chlorophyll content didn＇ t change obviously, CO2 enrichment had positive effect on Rubisco activity, and glycolate oxidase activity apparently decreased in leaves.