I don't think the seed provides any of the winding/unwinding energy. I presume the energy for the unwinding comes from the exothermic (spontaneous, energy-releasing) process of hydration of the awn's cellulose/lignin, and the winding (dehydration) from environmental heat transfer (warm air, sunlight, wind). The initial winding also resulted from dehydration, and is repeated during each rewinding, with heat providing the energy. It's all built into the awn.
Wonderful glimpse into these tiny gems. Does the repeated winding/unwinding action occur without any expenditure of energy by the seed?
I don't think the seed provides any of the winding/unwinding energy. I presume the energy for the unwinding comes from the exothermic (spontaneous, energy-releasing) process of hydration of the awn's cellulose/lignin, and the winding (dehydration) from environmental heat transfer (warm air, sunlight, wind). The initial winding also resulted from dehydration, and is repeated during each rewinding, with heat providing the energy. It's all built into the awn.
Elegant!
Fascinating! Thanks so much for sharing - and for the YouTube links that really bring it this process to life!