Sunflowers face the sun

Sunflowers turn towards the sun, which is an interesting phenomenon. As soon as it encounters light, it will rotate with the sun, but this means that during the period from germination to full bloom, its leaves and flower plate will turn from east to west with the rotation of the sun. After the flowerpot is in full bloom, it will not rotate again, but will face the East.

In fact, although the flowers and leaves of sunflower rotate with the sun, it is not synchronized in real time. After scientists' measurement, it is found that its rotation will slightly lag behind the sun. When it rotates, when the sun rises in the morning, it will rotate westward. After the sun sets, its flower plate will slowly swing back, and it will turn back to the east at about 3 a.m.

Why is it facing the sun

The main reason for turning towards the sun is the influence of light.

The auxin of sunflower is distributed on the stem tip and continuously transported downward. It will be affected by light. Generally speaking, its auxin is distributed in the backlight, and the concentration of auxin on the side facing the sun is relatively low, but the concentration of auxin on the side facing the light is relatively high, so the growth on the backlight side is faster, while the growth on the light side is slower, which makes the stem bend against the light and keep it facing the sun.

In addition, it is also believed that the reason why sunflowers rotate towards the sun is also related to gravity and leaf yellow oxide. Gravity means that it will rotate with the sun in the early stage of growth and the young stage of the flower pot; In terms of leaf yellow oxide, it means that this substance can hinder the growth of sunflower cells. Generally, the concentration of leaf yellow oxide on the light side is higher, so it will make the sunflower grow slower on the light side, resulting in bending.

Well, that's how the sunflower comes from. Isn't it amazing?