Effect of doubled CO2 and O3 concentration and their interactions on ultrastructure of soybean chloroplast
CO2和O3浓度倍增及其交互作用对大豆叶绿体超微结构的影响

The effect of doubled CO 2 and O3 concentration on the ultrastructure of chloroplast in leaf cells of soybean was tested by open top chamber method,and examined under transmission electron microscope. The results showed that under doubled CO 2 concentration,the amount and volume of starch grains in chloroplast increased,but the chloroplast membrane and the lamellar structure still kept integrated. The accumulation of starch grains was restrained,and the chloroplast membrane and the lamellar structure were disorganized under doubled O 3 concentration. The ultrastructure of chloroplast was destroyed in different degrees under the interaction of doubled CO 2 and O 3 concentration. The damage to chloroplast arose from the abrupt doubling of CO 2 and O 3 was more severe than that from gradual increase of CO 2 and O 3 concentration. The negative effect of O 3 was partly compensated by the positive effect of doubled CO 2.