hyponasty
/ˌhaɪpəˈnæsti/
noun
- The upward bending or curving of a plant part (such as a leaf or petal) caused by faster growth on the lower side.
- The gardener noticed hyponasty in the rose petals as they opened toward the sun.
- In some plants, hyponasty is a response to changes in temperature or humidity.
- Hyponasty helps young leaves lift upward to capture more light for photosynthesis.