Why are cacti so durable? Why are cacti drought tolerant?

The roots of the cactus are well developed; Its leaves are needle-shaped, which prevents water from being lost quickly; It stores water, cuts through cacti, and has a lot of water in it (some poisonous); But if the environment is too bad, there will be dryness. Because the water loss of plants mainly depends on the stomata on the leaves to eliminate the water vapor caused by the transpiration in the plant, and the leaves of the cactus have degenerated into stinging needles, so there is no organ that can remove water, and the natural water loss is less. In addition, the root of the cactus is super absorbent, and it can also draw water from the void, so it can live even if you don't water it.

Plants such as cacti, cactus and cactus are characterized by the degeneration of needle-like leaves, strong keratinization of the epidermis, deep stomata and the parenchyma in their bodies that can store a large amount of water, sometimes up to 95% of their own weightThere is abundant mucus inside the cells, and as the friend upstairs called the alienation of the stem, it becomes obese and fleshy. Leaf degradation and keratinization of the stem surface and deep stomata are designed to reduce water evaporation, as water is lost mainly through transpiration on the body surface, especially from the stomata.

The degradation of the leaves greatly reduces the area of water loss. The deep stomata make it more difficult to lose water on the surface of the stem, and the roots of the cactus are very large, and when there is a lack of water, its roots will lengthen, and it will not stop until it finds a source of water, and when there is no water, it will be digging into the ground.

The longevity of cacti is relative to that of dry and hot regions, and is the result of the long-term evolution of plants in this region.

1. The leaves mutate into slender thorns or white hairs to reduce the transpiration of water, weaken the harm of strong sunlight to the plant, and also make the moisture continue to accumulate and condense into water droplets, which drip to the ground and be absorbed by the shallowly distributed roots;

2. The stalk is thick, thick and juicy, with well-developed parenchyma tissue cells, with ribs, so that its body can expand freely, and it can expand rapidly when there is more water in the body, and can shrink inward when it is drought and lack of water, which not only protects the plant epidermis, but also dissipates heat.

The role of temperature. 3. The epidermis of the stem has a thick and hard wax as a protective layer, or has dense fluff to protect it from strong light and reduce water evaporation.

4. The stomata are open at night and closed during the day to reduce water dispersion.

Lose. 5. The stalk is green, which can replace the photosynthesis of leaves and make food.

6. There are many root branches and a huge system, and many new roots will grow in the topsoil when it rains, absorbing a large amount of water. Its large roots are protected by a thick wooden cork and can live on scorching sand without dying.

It is these morphological structures and physiological characteristics that make cacti plant-like.

It is amazingly drought resistant.

The root system is well developed, waxy stems, needle-like leaves. Well-developed root system: The cactus has a well-developed root system that allows it to penetrate deep into the soil and spread horizontally, allowing it to obtain groundwater to replenish its water.

Waxy stems: The stems have a layer of wax that protects them from the sun and dehydration, and also reduces the evaporation of water from the plant, making it more resistant to drought.

Needle-like leaves: The leaves are acupuncture-buried and acupuncture, which can reduce water evaporation, help the plant retain more water, and can collect moisture in the air for root growth.

Cacti are drought-tolerant and are experts in water storage. It has a lot of water in its stem nodes that can be drunk and can be used as its own water source. Cactus is a common drought-tolerant plant that originally grew in the desert and can adapt to very harsh environments.

How many degrees of heat does the cactus withstand.

When the cactus cultivation temperature reaches 38 or above, most of them grow slowly or stop growing completely, and are in a dormant or semi-dormant state. Epiphytic cacti are not as resistant to high temperatures as terrestrial cacti.

Cacti prefer water or drought.

Cacti love the sun and are not afraid of dryness, and are watered once a month in spring and summer, and every 2-3 months in winter. Pay attention to the air and land to water thoroughly.

Cactus drought tolerance reasons.

The leaves of the cactus mutate into slender spines or white hairs, which can reduce the transpiration of water, weaken the damage of strong light to the plant, and cause the water to accumulate and condense into water droplets, which are absorbed by the shallow roots on the ground. The cactus stem is thick and juicy, and the parenchyma cells and ribs are well developed, so that the body can stretch freely in the form of a reed, and the body will expand rapidly when there is a lot of water in the body. When there is a shortage of water in drought, it will shrink inward, which not only protects the plant skin, but also has the effect of heat dissipation and cooling.

Cacti are drought tolerant or water tolerant.

The cactus is drought tolerant and not afraid of rain and waterlogging, especially its roots. If flooded, it often leads to root rot. It is recommended that cacti should be exposed to the sun frequently and wait for the potting soil to dry before watering. Don't overdo it.

The son woman's family is angry and charged! Twenty-five o'clock, you're me, what are you, what are you!

The root system is well developed and has a strong ability to absorb water; The leaves are needle-shaped, with weak transpiration and little water loss; Drink more, vomit less, natural water retention ability, that is, drought tolerance. o(∩_o~

Because it has a well-developed root system and a large area to absorb water; The stem is thick and plays the role of preserving water; Its leaves (spines) are small, reducing the evaporation of water!

It has a thick warp and sufficient moisture to resist drought.

Succulents such as cacti, cactus, and aloe vera are born to be drought tolerant and heat-tolerant.

Because its leaves are transformed into spines, it can store maximum water.

Because it does not lose much water, the leaves are only needle-shaped, and it is not easy for water to evaporate.

Roots: The root system is much more sensitive to water than normal plants and absorbs water as soon as it is felt. Moreover, the root system grows quickly and is very developed, and some varieties can go tens of meters deep into the ground to obtain water.

The taproot of some varieties will develop into a water-storing organ that has no absorption capacity and no ability to breathe - radish root.

Stems: Most varieties are fleshy, absorb water through roots and leaves in the rainy season, and the stems store a lot of water, so they swell and plump, and in the dry season they will dry up and shrink with water consumption. And the stem is also the photosynthetic organ of the cactus.

Leaves: evolved into thorny, pinny, hairy, etc. There are pores under the microscope that are used to breathe and absorb moisture from the air.

During the rainy season, the spines are full and thick, and the stomata open to absorb moisture from the air. In times of drought, the spines are hard and atrophied, and the stomata shrink to reduce water loss caused by transpiration. The pinnate and hairy leaves, which grow very luxuriant during the sunny season, have reduced the damage of too much sunlight to the stems.

Psammophytes are not afraid of drought The most famous type of psammophytes are cactiaceae, their leaves are degraded and can reduce water transpiration, their stems are fleshy and can be saturated with water, and their stems contain chlorophyll for photosynthesis to make food. Psammophytes live in the desert water shortage environment for a long time, and gradually adapt to the arid climate, there are various ways to resist drought, some psammophytes rely on deep roots to absorb groundwater to resist drought, the degree of root depth is often amazing, such as the roots of camel thorns, can go deep into the ground 15 meters of water source to absorb water. Camel thorns are born in the desert of northwest China.

In the Sahara Desert of Africa, there is a plant called "desert oleander", and the stomata under its leaves are sunken in a hole, and the hole has hairs to prevent the water from transpiring too quickly. Strangely enough, it has a vapor emitted by volatile oil, which envelops the tree, which can also prevent excessive transpiration and achieve drought resistance.

The reason why cacti can tolerate drought: In order to adapt to the arid environment, the leaves of cacti degenerate into needles to reduce water evaporation, but the stems are thick and juicy, and the surface is protected by thick and hard wax, so that it is not exposed to sunlight, plus cacti plants have huge root branches, which can absorb more water from the ground. Seeing this, I can't help but admire the tenacious vitality of the cactus, its surface is green, it turns out that there is a lot of water storage inside, and it doesn't matter if you don't water it for a few months.

In order to adapt to the arid and rainless desert environment, over the years, the cactus constantly changes its shape, and the leaves gradually disappear and become root thorns or dense hairs to minimize water transpiration. The leaves of the cactus are degraded and rely on the stems to make nutrients, while the stems are green and perform the function of the leaves, photosynthesizing in the sun. Therefore, the spines of the cactus are made from the leaves.

Because it comes from a place where there is no water, it does not have leaves (or the leaves become needles) and evaporates small, so it is drought tolerant.

There is less evaporation of water, and the leaves evolve into thorns.

Because it has no water to drink, it doesn't drink.