Why do leaves change color Reasons why leaves change color

In the leaves of plants, there are many natural pigments such as chlorophyll, lutein, anthocyanins, and carotene. The color of the leaves is due to the different content and proportion of these pigments.

In spring and summer, the content of chlorophyll is larger, while the content of lutein and carotene is much lower than that of chlorophyll, so their color cannot be revealed, and the leaves show the green color of chlorophyll. Because the synthesis of chlorophyll requires strong light and higher temperature, in autumn, as the temperature drops, the light becomes weaker, the chlorophyll synthesis is blocked, and the chlorophyll is unstable, and the light is easy to decompose, and the decomposed chlorophyll can not be replenished. Therefore, the proportion of chlorophyll in the leaves decreases, while lutein and carotene are relatively stable and not susceptible to external influences.

As a result, the leaves show the yellow color of these pigments.

In the leaves of plants, there is a starch produced by photosynthesis, which can only be transported to various parts of the plant when it is converted into glucose. However, in late autumn, when the weather becomes colder, the starch produced by the leaves during the day cannot be completely converted into glucose at night due to the weakening of the transport effect, and the moisture in the leaves is gradually reduced, so the glucose remains in the leaves, and the concentration is getting higher and higher. The increase of glucose and the low temperature in autumn are conducive to the formation of anthocyanins.

Therefore, the anthocyanin content gradually increased while the chlorophyll content gradually decreased. Anthocyanins are unstable organic substances that have no color of their own and turn red when it encounters acids and blue when it encounters alkaline substances. In this way, the anthocyanins turn red in the acidic mesophyll cells, so the leaves turn bright red.

Why do the leaves change color every autumn? What are the factors that determine the discoloration of leaves?

The reason for the discoloration of the leaves is related to the chemicals inside it – chlorophyll, carotenoids, anthocyanins, etc. It is also the result of the comprehensive effect of external temperature, temperature difference, light and other factors. In spring and summer, chlorophyll synthesis is greater than decomposition, and the leaves are green; Autumn is coming, the temperature drops, and the amount of chlorophyll synthesized is less than the amount of chlorophyll that is decomposed.

When its content decreases, other chemical pigments appear. If the ratio of carotenoids (lutein and carotene) is high, the leaves will be yellow or orange; In late autumn, due to the low temperature, the ability of the leaves to transport sugar and water is weakened, and the concentration of glucose increases, and the increase in soluble sugars makes the cells acidic.

Under acidic conditions, anthocyanins turn red, as do leaves with a high proportion of anthocyanins. Of course, leaf discoloration is a complex process. When the cold air is strong, the temperature drops, causing low temperatures.

After that, the weather was sunny and the temperature difference was large. Such meteorological conditions promote the rapid conversion of chlorophyll into carotenoids and anthocyanins in the leaves. The external change is that the color of the leaves gradually changes from green to yellow, orange, red.

You should be familiar with chlorophyll, because almost all natural plant leaves contain chlorophyll. Through chlorophyll, the leaves absorb the energy needed by the sun and extract nutrients from water and carbon dioxide. Chlorophyll occupies a very important place in plants.

Chlorophyll is green and is the main chemical hidden in the leaves. In spring and summer, the color of the leaves is green.

With the arrival of autumn, the days become shorter and the plants photosynthesize less, so the leaves contain very little chlorophyll and will slowly change to other colors. Colors of many plants, fruits, vegetables, etc. All are related to anthocyanins, which are water-soluble natural pigments.

The color of anthocyanins is affected by a variety of factors, such as low temperature, lack of oxygen, etc., which will reduce the formation of anthocyanins. Anthocyanins can absorb green light, blue light, etc. In autumn, anthocyanins increase rapidly, showing more vibrant colors such as scarlet, purple, etc.

Because the proportions of the leaves are different, the color will also be different. In fact, there are many reasons for leaf discoloration, but the above three reasons are the main ones.

Leaf discoloration is also related to temperature, humidity, soil, pH, but light is important. Autumn is much less sunny than summer, so the leaves turn from green to yellow. As winter approaches, many changes take place in the plants.

Temperatures drop and daylight hours are shortened. The green tones of the leaves have disappeared, and other colors covered in chlorophyll can now be seen, replaced by the stunning splendor of autumn. Temperature can also affect the color of autumn leaves.

The higher the temperature, the brighter the color, and vice versa. Some trees shed their leaves, while others do not. In the north, winters are colder, forcing most tree species to lose their leaves, with a few exceptions.

The color of a plant is directly dependent on the pigment in its cells. Among them, chlorophyll is the most abundant. Ordinary healthy leaves are so full of chlorophyll that against the background of this green photosynthetic beauty, other pigments are invisible.

However, once the chlorophyll leaves the leaves, then the color inevitably changes.

Other pigments can be divided into two categories according to their **: carotene and anthocyanins. With carotene, everything is simple, these pigments produce yellow and orange colors and are faithful companions to chlorophyll, preventing it from overheating in the sun.

Anthocyanins, on the other hand, are responsible for a range of colors, from red to blue. Anthocyanins can not only synthesize color, but they can also cope with cold weather throughout the plant's life cycle, and their goal is to protect cells from freezing and dying.

In addition, the discoloration of leaves is also related to temperature, humidity, soil and pH value, among which the light factor is very important, autumn light is much less than summer light, so the leaves will change from green to yellow and other different colors. As the temperature drops, the hours of daylight shorten, the green hue of the leaves disappears, and other colors obscured by chlorophyll now become visible, replaced by the breathtaking brilliance of autumn, the temperature also affects the color of the autumn leaves, the higher the temperature, the brighter the color, and vice versa.

The cause of the discoloration of leaves is related to the chemical chlorophyll it contains. Many leaves also contain other pigments such as yellow, orange and red, and as the chlorophyll content gradually decreases, the color of other pigments will gradually appear on the leaf surface, so that the leaves will show yellow, red and other colors. <

The cause of the discoloration of leaves is related to the chemical chlorophyll it contains. Many leaves also contain other pigments such as yellow, orange and red, and as the chlorophyll content gradually decreases, the color of other pigments will gradually appear on the leaf surface, so that the leaves will show yellow, red and other colors.

How to protect trees: 1. Don't cut down trees indiscriminately, don't pick flowers and pull weeds. Flowers and trees are the green barrier of the earth, and we should protect it well.

And it can't be destroyed at will. If you cut down trees indiscriminately, you may end soil erosion. Defencing flowers and pulling weeds will pollute the environment and seriously complete land desertification.

2. In winter, wrap a rope around the trunk of the tree so that it is no longer cold. Wrap the trunk in a thick layer to keep it warm. Prevent tree trunk cracking.

3. Don't pick leaves indiscriminately, don't swing on branches. This protects the leaves, as well as the branches, from falling off. Especially children must pay attention.

4. Don't step over the leaves, don't let the leaves have scars. Scars are difficult to heal and can affect the growth of the tree.

5. Don't spit on the lawn and don't litter. These are all small things within our ability, and we must start from the trivial things around us and cultivate good environmental habits.

6. Don't scribble on trees.

Hello, the leaves of all kinds of succulents will change color, when the temperature difference is large, and then after the light, in autumn or spring, the color will become very beautiful.

1. Soil. Succulents are suitable for using soil with good water permeability, good air permeability, dry, sterile and insect-free. Beginners recommend using a perlite and coir mix (1:

2) to make substrates, suitable for the growth needs of most succulents. For the dry climate of the north, it is necessary to increase the moisture retention properties of the soil; For wet and rainy southern weather, it is necessary to improve the drainage performance of the soil.

2. Illumination. Succulents need plenty of light to grow, and too little or dark light can lead to growth. When raising succulents indoors, it is advisable to place them in a sunny window or balcony.

If the temperature is too high in summer, you can use a shading net with a shading rate of 70% and avoid the sun exposure at 12-15 o'clock; In other seasons, you can get enough sunlight.

3. Moisture. The principle of watering succulents is to water less and thoroughly, so as to avoid root rot and black rot caused by water accumulation in the pot; Too much water is also not conducive to the shape of the succulent, making it grow. In spring and autumn is the succulent growing season, and the best time to water is when the lower leaves start to dry up; Summer is the succulent dormant season, and spray watering is the main way to keep the surface of the potting soil moist; The frequency of watering should be reduced in winter.

4. Temperature. Succulents are native to South Africa, and the most suitable growing temperature is between 12 and 28 degrees Celsius, so spring and autumn are the most vigorous seasons for succulents. To raise more succulents at home, it is necessary to ensure that the room temperature is above 8 degrees Celsius in winter and below 35 degrees Celsius in summer, and pay attention to ventilation and cooling.

5. Fertilizer. Succulents have a low dependence on fertilizers, but moderate fertilization has a good effect on their healthy growth. Succulent fertilization follows the principle of thin fertilizer and frequent application, and changing pots in spring and autumn is the best time for fertilization; During the dormant period, fertilization must be stopped to avoid root rot.

6. Summary. The most important aspect of raising succulents is to maintain sufficient light, moderate watering, and friends who raise them at home should pay attention to the room temperature should not be too low or too high, and use good culture soil with water permeability and air permeability.

When autumn arrives, the temperature begins to drop and the trees begin to roll and bend in preparation for hibernation. This drop in temperature causes the chlorophyll in the leaves to break down, resulting in a higher concentration of other pigments, such as carotenoids and anthocyanins, in addition to chlorophyll. These pigments begin to be produced after chlorophyll breaks down, and the shorter hours of daylight and less light in autumn are also one of the causes of leaf discoloration.

As photosynthesis decreases, the chlorophyll in the leaves no longer needs to be produced in large quantities and is gradually broken down, allowing for higher concentrations of other pigments.

When the leaves change color, the trees remove nutrients from the leaves** for storage during the winter months. These nutrients, including proteins, sugars and amino acids, are brought back to the trunk and roots to be used during the growing season in the following year.

The discoloration of the leaves is one of the most beautiful sights of autumn, and it is caused by factors such as falling temperatures, reduced light, and insufficient moisture. During the discoloration of the leaves, chlorophyll begins to break down, other pigments begin to be produced, and nutrients are also **. These processes work together to give the leaves different colors and give us a beautiful autumn scene.

3.Nutrients**.

3.Lack of moisture.

1.Breakdown of chlorophyll.

Chlorophyll is the most important chromaine in leaves, and it plays an important role in the delay of the photosynthetic ridge. However, as the temperature drops and the light decreases, the chlorophyll begins to break down, allowing the concentration of other pigments to become higher

1.The temperature drops.

In addition to chlorophyll, the leaves also contain other pigments, such as carotenoids and anthocyanins. These pigments begin to be produced after the chlorophyll breaks down, clap your hands.

2.Reduced light.

3.Nutrients**.

3.Lack of moisture.

3.Lack of moisture.