Improving the leaf photosynthetic capacity of soybean plants can increase their growth. In this study, researchers looked at different soybean types to see what factors affect their photosynthesis. They found that some soybean lines have higher photosynthetic rates than others, with Line no. 14 showing the best performance. This line had higher CO2 fixation activity, which helps plants grow better. The researchers think that the high photosynthetic capacity of soybean plants is due to their ability to fix CO2 efficiently.