Why yellow leaves in plants. Why turn yellow and fall leaves

Has Long been proven that plants are living beings. They, like animals, eat, breathe, reproduce. In them there are thousands of biochemical reactions, the formation of nutrients from them to remove decomposition products as a result of metabolism. That is, all the processes that characterize the manifestation of life present in the plants, making the planet incredibly beautiful, clean and diverse.

Biological rhythms

How plants breathe? Why leaves turn yellow from them? What do they eat? How to grow? Many questions arise from those who see these amazing creatures, so various, beautiful, bright and colorful.

For all of the plants characteristic of certain biological rhythms, as well as for other living organisms. These include:

• The expansion of the buds and their closure under the influence of length of photoperiod and chemical composition of the environment;
• Intense building mass escape;
• The compression and opening of stomata on the leaves.
• The strengthening or weakening of respiration, photosynthesis;
• Leaf and others.

Thus, the answer to the question about why leaves turn yellow in plants, lies in the mechanisms of biological rhythms. These processes allow them to adapt to the environment, to survive them to carry out vital functions as efficiently as possible, to grow and develop, respond to chemical and physical action of nature, human beings, animals and so on.

Why yellow leaves on trees, for example? It is also one of the manifestations of biological rhythm, which is aimed at preserving the viability of individuals in low temperatures and reducing the amount of sunlight and moisture. The color of the leaf blade is determined by special substances in its composition.

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Plant Pigments contained in the leaves

Why turn yellow and fall off the leaves? Yes, because there is a rearrangement of chemical reactions inside the plant body. A representative of the flora in its composition contains a number of pigments - the substances that determine the color of organs (leaves, crowns of flowers, stems, and so on). Total there are four main groups of such compounds:

1. Chlorophyll. The pigment containing in its structure the cations of magnesium and several porphyrin rings. It attaches to the plant and its parts a rich green, is taking an active part in the processes of photosynthesis. It is there that the impact of plants on light convert solar energy into energy of chemical bonds. So form the spare nutrient is starch. Under favorable conditions, in evergreen plants, the chlorophyll is in the majority, so the other pigments show through.
2. Xanthophyll. This compound found in all individuals, however is not seen under favourable conditions, as is inhibited by chlorophyll. Many algae in the corollas of flowers, the stems of this pigment reveals itself, forming a yellow color.
3. Carotenoid. The orange color of the leaves, parts of the shoot, the Corolla of the flowers is determined by this connection. Chlorophyll often is suppressed and manifests itself only upon the occurrence of low temperatures, and adverse environmental conditions.
4. Anthocyanins - the pigments that cause the formation of beautiful red colors of plant parts. In the same way as the previous two, appears in natural form only in halos of flowers or seaweed (red algae). The alteration and destruction of the porphyrin rings of chlorophyll causes a stronger effect of anthocyanins.

   

All of these pigments is primarily to give an external response to a change of state of the individuals. Why do plant leaves turn yellow what causes these symptoms, take a closer look.

Causes of leaf fall in trees

The Phenomenon of defoliation is one of the most beautiful in nature. That is why autumn is the favorite season of many poets. After all, the beauty of the surroundings cannot be a source of inspiration for creative people. Multicolored circle, yellow, green, red, orange and even brownish-purple shades just circling the head, and the smell of fallen leaves pleasing smell.

What caused such changes and is it always right? Consider the causes defoliation of the trees. They can be grouped into two groups: natural and forced. Each includes a number of items and explanations.

Natural

These reasons include the seasonal change of weather conditions, as well as changing length of daylight. All summer green giants prepare for these rhythmic changes. Accumulate nutrients and store them in stems and trunks, actively carry out the processes of photosynthesis and respiration, consume the maximum possible amount of moisture.

With the onset of cold weather, short days of light inside the leaf plates to start the conversion.

1. Pigment chlorophyll begins to act less and less, the color fades. This gives the opportunity to show other pigments. As a result, the leaves turn yellow, red and so on. What will be the color of falling leaves, depends on the genetic characteristics of the tree species.And the interesting fact is that the brighter the sun in autumn, the chlorophyll is destroyed faster, and the leaves turn yellow. During heavy rains the trees longer pleasing greenery.
2. During the summer period in the plates of sheets accumulates a variety of metabolic products, salts, minerals. This makes the sheet heavy and he gradually begins to flake in the center of the petiole from the stem.
3. At the base of the petiole, between him and the trunk, start the processes of formation of special tissue layer, gradually rejects the sheet.
4. Under the influence of mechanical factors (rain, wind, storm, etc.), gravity, all the leaves start to turn to fall.

Forced

The question about why leaves turn yellow, there is another answer. This occurs for involuntary reasons, such as:

• Sharp temperature fluctuations;
• Lack of mineral supply;
• Lack of sufficient moisture or surplus;
• Hard direct sunlight;
• The parasite viability.

  

These factors reduce the vitality of trees. That's why yellow leaves on them.

Plants

Many gardeners also raises the question: "Why do flowers have yellow leaves?" Often you can see the drooping parts of plants, their unhealthy, pale appearance, and this applies not only flowering species but also ferns, recivership plants and succulents. What is the reason, try to understand.

Causes yellowing

Why the flower leaves turn yellow?

1. Excessive or insufficient irrigation.
2. Too much sunshine or the lack of it.
3. Lack of potassium, magnesium and other minerals.
4. The defeat of the escape or of the roots of the pests.
5. Excess dust, fungi and bacteria.

This is the most common causes of yellowing leaves in plants.

Methods to address the phenomenon

Before you take action, you need to determine the specific reason why the flower is yellow leaves. To do this, study the materials for the care of each particular plant, because any of them requires an individual approach.

Next, you need to limit the limiting factor of the development, if it is insufficient irrigation - to increase it if excess is to reduce, to protect from the sun or add it, feed fertilizers, but not to overdo it. The main thing - remember that the flowers, love purity. So they need to be protected from dust, debris and dirt.