Do you know why the leaves turn yellow in autumn?

Autumn leaves will turn yellow, because the temperature is low, it stops chlorophyll manufacturing, leaves no longer photosynthesize, so slowly the green pigment is consumed, there will be other colors, leaves are not simply green, but also include several other colors, because other colors can not be photosynthesized, usually covered by green, and when the green pigment stops working, it will show other colors, autumn will appear red leaves, yellow leaves, these colors can not carry out photosynthesis, so after a period of time it will drift zero.

I think it's because the leaves of these green plants contain chlorophyll, carotenoids (including orange-yellow carotene and yellow lutein), etc. During the growing season, due to the normal metabolism of the plant body, some chlorophyll is destroyed and others are produced, so that chlorophyll is always dominant in the leaves, and the dominant chlorophyll masks the other pigments, so the leaves remain green all the time. Autumn comes, the temperature drops, the synthesis of chlorophyll is hindered, and the destruction of chlorophyll is increasing day by day.

Chlorophyll disappears quickly in the leaves, which creates the conditions for other pigments to reveal color in the leaves. Therefore, leaves containing more lutein and carotene appear yellow. ‍‍

In autumn, many trees turn their leaves yellow before falling leaves, and this is because the leaves contain a lot of pigments such as chlorophyll, lutein, carotene, etc. Chlorophyll is darker in color, often covering other pigments in summer and showing a green color, but when autumn comes, the temperature slowly decreases, chlorophyll will be destroyed and gradually disappear, then yellow lutein, carotene will be displayed, which is why the leaves will turn color in autumn, and some will turn red. ‍‍

I think this is the law of nature, people live for a lifetime, and plants and trees for an autumn. When people get old, their hair turns gray until they die, and the reason is the same, except that the trees are only fallen leaves, and they are still maintaining nutrients, and the trees themselves do not die. In autumn, the weather gradually cools and becomes colder, due to the weakening of photosynthesis, the trees stop chlorophyll synthesis and sustenance, and the leaves turn yellow and fall off, and in winter, the temperature is lower, and the green leaves also fall off with the freezing.

I think the main reason why the leaves turn yellow in autumn is that the leaves contain chlorophyll, lutein and carotene. In spring and summer, chlorophyll is much more abundant in the leaves than other pigments, so the leaves show the green color of chlorophyll and the color of other pigments is not visible.

Personally, I think it is due to the environment, sufficient light and low temperatures will accelerate the process of chlorophyll destruction, cool temperatures at night and plenty of sunlight during the day will promote the formation of more anthocyanins, and if there is a threat of drought during the growing season, this will lead to the formation of a separation layer earlier, and the green leaves may fall before they have a chance to change to other colors. Wind and heavy rain will cause the leaves to fall before all the colors have evolved

The leaves are green because of the chlorophyll in the leaves. However, in addition to green pigment, there are many pigments such as red pigment and yellow pigment in the leaves, but the amount is very small. In autumn, the green pigment slowly fades, and the red pigment and yellow pigment are revealed, making the forest a golden yellow or a fiery red, which is very beautiful. ‍‍

When autumn comes, the moisture of the tree will slowly become the root of the tree, and the leaves on the tree will lose the balance of moisture, so the leaves on the tree will change from green to yellow, and then slowly wither and fall. ‍

A lifetime of life, a autumn of grass and trees; People add gray hair when they are middle-aged, and the leaves of trees turn yellow after the beginning of autumn; People have been sparse for seventy years, and the leaves of the trees have fallen through the cold dew. The temperature difference between the white night of the beginning of autumn is large, and it is cold and rainy. It is mainly the yellowing of the leaves when the temperature difference between day and night changes greatly. ‍‍

Just like animals, old. If the nutrition can't keep up, the hair will turn gray.

<>1. The leaves of most trees will turn yellow and fall in autumn, because the chlorophyll in the leaves will slowly decrease in autumn, and the original color of the leaves will be slowly revealed. In the spring, the leaves will photosynthesize, resulting in a large amount of chlorophyll, and in the autumn, when the light weakens and the growth of the tree slows down, the carotene in the leaves will emerge.

2. In fact, yellow is the original hidden color of the leaves, the reason why it will appear green is because the leaves contain a lot of chlorophyll, but in addition to chlorophyll, the leaves also contain red pigment, yellow pigment, etc., when the weather turns cool in autumn, the infusion stops working, and the nutrients in the leaves cannot be transmitted to the branches and trunks, so they will slowly precipitate to the leaves and turn yellow.

3. There are many trees whose leaves turn yellow in autumn, such as sycamore, ginkgo, pomegranate, acacia, etc. Generally speaking, the leaves of plants mainly contain leaf green, lutein and carotene, and these three pigments will change due to the change of temperature, so the leaves will also show different colors.

In autumn, the chlorophyll in the leaves will decrease, and the original color of the leaves will emerge, and the leaves mainly contain chlorophyll, lutein, and carotene, and the leaves will photosynthesize in spring and autumn, and a large amount of chlorophyll will appear in the leaves. In autumn, when the light is weaker and the trees grow at a slower rate, lutein or carotene will emerge in the leaves.

Many trees have yellow leaves in autumn, so why do the leaves turn yellow in autumn, in autumn the days will be shortened and the nights will become longer, at this time the time for the leaves to photosynthesize will be shortened, and the chlorophyll in the leaves will be reduced, and the leaves will turn yellow. In autumn, the leaves show the hidden colors of the leaves.

The reason why the leaves are green is that the leaves contain a lot of chlorophyll, but in addition to chlorophyll, the leaves also contain a variety of pigments such as red pigment and yellow pigment. When the weather gets cooler, the leaves stop working, and the nutrients in the leaves cannot be transferred to the branches and trunks, so they settle into the leaves and turn yellow.

Trees whose leaves turn yellow in autumn include ginkgo, metasequoia, pomegranate, plane tree, acacia, sycamore, etc., and the mesophyll of plants mainly contains chlorophyll, lutein and carotene, which change with the change of temperature. Autumn temperatures are much cooler than spring and summer, when the leaves produce a lot of carotene.

Trees usually use chlorophyll to capture sunlight and use other substances in the leaves to convert sunlight into sugars and other chemicals for storage. In autumn, when the light is weaker and the trees grow more slowly, this is when other substances in the leaves will be revealed.

The leaves will turn yellow in autumn because the trees will stop growing in the fall, and the chlorophyll in the leaves will be broken down, leaving only yellow pigment or red pigment, so that the color of the leaves will change to yellow, and the trees will grow green leaves again after spring.

The green color of the leaves is due to the chlorophyll contained in the leaves, and the trees stop growing in the fall, and the leaves will decompose all the chlorophyll they contain before falling, leaving only the yellow or red pigment that cannot be decomposed, so that the color of the leaves will change to yellow or red.

When cultivating trees, it is necessary to prepare sharp scissors that have been disinfected, cut off all the wilted and yellowed branches and leaves of the plant, so as not to lose excess nutrients, and spray carbendazim or potassium permanganate solution to the fracture of the tree to disinfect and sterilize it to maintain the normal growth of the plant.

If you want the trees to survive the winter, you need to take warm measures for them, you can wrap cotton cloth or straw mats on the trunk of the plant to avoid frostbite of the tree, and use quicklime, sulfur powder and water to prepare a whitening agent, and then apply it to the trunk of the tree to avoid cracking the bark.

When breeding trees, it is necessary to apply fertilizer 2-3 times in the peak growth season of the plant, you can choose well-rotted organic fertilizer or nitrogen, phosphorus and potassium compound fertilizer, and dig a row ditch at the edge of the tree crown reflection, and then bury the fertilizer into the row ditch to promote the vigorous growth of trees.