The study looked at how lack of water affects soybean plants during their flowering stage. They used a technique called chlorophyll fluorescence to measure certain parameters. The results showed that when soybeans were stressed by drought, their ability to convert light into energy decreased, but their ability to transport electrons increased. This means that the plants were damaged by the lack of water, but some were better at coping with it than others. One type of soybean, Xindadou 1, was particularly good at turning light energy into chemical energy and was more resistant to drought. By looking at these chlorophyll fluorescence parameters, scientists can tell how well soybeans can handle drought.