Phyllostachys pubescens seedlings were studied to see how they respond to not having enough water. The researchers used special tools to measure how well the seedlings were doing photosynthesis and how their chlorophyll was working. They found that as the seedlings had less water, their photosynthesis slowed down because their photosystem II got less active. The seedlings also had lower maximum photosynthetic rates and light saturation points when they were really stressed. However, their water use efficiency increased a bit under light stress. Overall, the seedlings' chlorophyll and photosynthesis were affected by the lack of water, with some changes being more noticeable as the stress got worse.