My family planted several pots of flowers, and the roots of each flower first planted some humble amaranth from the soil. Their bright green leaves with big three petals and small six petals are evenly spread in the basin, which also adds a bit of beauty to the basin. After winter, in order to prevent the pots from being attacked by cold current, my father moved them into the house.

One night, I got up in the middle of the night to pee, and I accidentally saw the leaves of rhinoceros horn drooping, as if they were wilting. Look at other pots of rhinoceros horn. I thought the grass might be dying because it didn't adapt to the indoor environment. When I got up the next morning, the withered leaves of rhinoceros horn unfolded again last night. How did this happen? I decided to solve the mystery. In the next few nights, I often observe carefully by the flowerpot and write down my observation diary.

After 7 o'clock in the evening, the leaves of Salvia angustifolia began to droop, slowly closed into a triangle, and tightly "hugged" the petiole, like a folded umbrella; 10 point, all leaves are closed; After dawn, these closed leaves open again to welcome the rising sun, and use light energy to make water and carbon dioxide become organic matter again. So I concluded that the grass will also "sleep".

Why does grass sleep like people? I searched the relevant information and finally uncovered the secret.

It turns out that this form of exercise, which changes with the cycle of day and night, is a kind of nasal movement caused by the stimulation of night arrival, also known as "night feeling exercise" or "sleep exercise" The night sensation movement of Suaeda salsa shows that the leaves are downward at night and upward during the day.

This nocturnal movement of Suaeda salsa is caused by the different auxin contents on the upper and lower sides of its petiole. During the day, when auxin in leaves moves to the petiole under sunlight, it is mostly concentrated in the leaf part connected with the sieve tube under the petiole. Because of the high concentration of auxin in this part, the leaves grow faster and the leaves are facing up. At night, the auxin content of the upper petiole is higher than that of the lower petiole, which accelerates the growth of the upper petiole.

The secret of Suaeda salsa's diurnal variation was finally revealed.