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August 25, 2016 23:10

Why do leaves turn yellow ?

What is the list?From a botanical point of view is the outdoor plant body, whose main function is photosynthesis.That is why it has a lamellar structure in order to provide that the cells that contain the pigment chlorophyll in chloroplasts have access to sunlight.However, there are leaves, and other functions.So, they are the evaporation of body, breath and Guttation plants (the latter means the release of water droplets).Furthermore, they are capable of holding not only the water but also many nutrients.

Autumn leaf fall

It is known that in the autumn the leaves turn yellow and blush always (except for some plants).But why?As you may know from the school course, green shade foliage gives a large amount of the pigment chlorophyll, which is contained in them.It is by means of plant chlorophyll water and carbon dioxide in the light synthesizes glucose, and from it - and other useful nutrients.

However, not everyone remember that along with the chlorophyll in the leaves contain other pigments: car

otene and xanthophylls (the first is orange, and the second - yellow).During warmer months, these elements are practically invisible, disguised as a huge amount of chlorophyll.However, with the beginning of the cold of days this pigment gradually begins to break down, resulting in the leaves there are shades of carotene and xanthophyll.Interesting fact - chlorophyll, contrary to popular belief, is destroyed in the sunny days, not cloudy.Therefore, if the rainy autumn, the plants remain green longer.But when it comes to Indian summer, the foliage may change its color from green to yellow is literally within two or three days.

However, plants are not always dyed it yellow or orange hue, often leaves take a red tint.It is another pigment called anthocyanin.It is dissolved in the cell sap, and its quantity is increased only when the temperature is lowered, and in bright sunlight.And it stimulates the synthesis of the delay synthesis plant nutrients.It turns out that his brown hue represents the attenuation of the tree of life, which is preparing to leaf fall.

Home and crops

leaves tend to turn yellow not only trees, but also in many other plants, in particular, in the garden, for example, cucumbers and cabbage.Why is this happening?

  • may be several reasons.One of them is very simple - the lack of moisture.Again, remember the school curriculum - when it's drought, the plant begins to save water.And as the water evaporates through the leaves only, it must start to discard them.In this pre-yellow leaves and only then disappear.Therefore, in order that the plant would have no shortage of moisture, it must be periodically watered.Also highly undesirable, it grew in the room with dry air.
  • other equally simple cause of this problem - the lack of mineral salts, which are necessary for the synthesis of chlorophyll.Therefore, the plant should be fed magnesium, iron, nitrogen or other elements.
  • Finally, often lead to the yellowing foliage parasites, which may include a variety of insects, mites and various bacteria, viruses, fungi, and so on.Cope with them can be independently, the main thing to know how to do it.Usually help spraying various means, purchased in specialized shops.

Houseplants

Yet often a question that you can read the title of this topic, faced housewives, because they love working with plants in their free time.However, in this case, the causes of the difficulties can be quite a lot, we also tell you about the most common ones.

  • Primarily every gardener should know that many plants have a tendency to be updated, resulting in older leaves turn yellow and fall off, and after some time in their place, new shoots will appear.
  • However yellowing often occurs due to water overflow.Remember, each plant has its own rate of water consumption than that is not necessary, as the favorite flower for you is definitely not thank.
  • Another reason - drafts which are available in the room.Keep in mind that many plants, especially tropical, love heat and can not stand drafts.In this case if the plant is contained in a cold room, its leaves do not turn yellow, but rather just become lethargic.If a flower is near the air conditioner, we suggest you to rearrange it as far away from him, and even better - to another room, where cold air masses it will not interfere.
  • Experts advise to pay attention to the color of the sun, which is so necessary specific types of flowers.If they do not receive enough light, it may cause yellowing of leaves.By the way, to define it is not too difficult - look at the flower, if it began to fade and turn yellow on the other side, where there is no sunlight, then move it to a place where he will not lack it.In the extreme case, you can take advantage of fluorescent lamp.
  • possible that the plant is attacked by parasites or viruses.In the first case, a careful examination can be found, for example, mites, who decided to try the taste of the flower.In the second case the infection can talk about themselves yellow spots, spreading over the surface of the flower.If you can get rid of parasites in almost all cases, it is possible to cope with the infection not in all cases, alas.One should know that the virus can spread to other plants.
  • Finally, the problem may occur because of a lack of nutrients, and in this case, usually the upper leaves turn yellow, not lower