Effect of chlorophyll content on plant growth

The synthesis of chlorophyll in plants is mainly affected by the following five conditions:

1. Light: Light is an indispensable condition for chloroplast development and chlorophyll synthesis. If there is no light, the leaves of plants will turn yellow, and this phenomenon of yellowing the leaves due to the lack of certain conditions that affects the formation of chlorophyll is called yellowing.

2. Temperature: The synthesis of chlorophyll is a series of enzymatic reactions, so it is greatly affected by temperature. The minimum temperature of chlorophyll formation is about 2 4 , the optimal temperature is 20 30, and the maximum temperature is about 40.

Temperatures that are too high or too low will reduce the synthesis rate, and the original chlorophyll will be destroyed. The yellowing of leaves in autumn and the whitening of seedlings after the cold wave in early spring were related to the inhibition of chlorophyll formation by low temperature.

3. Mineral elements: nitrogen and magnesium are the components of chlorophyll, and iron, copper, manganese and zinc are the cofactors of enzymatic reactions in the synthesis of chlorophyll. When these elements are deficient, chlorophyll cannot be formed, and plants suffer from green deficiency, especially nitrogen, which has the greatest effect.

4. Water: Plant water deficiency will inhibit the biosynthesis of chlorophyll, and it is related to the hindrance of protein synthesis (enzymatic reaction). When there is a severe shortage of water, it will also accelerate the decomposition of the original chlorophyll, and the decomposition is greater than the synthesis, so the leaves are yellow-brown in drought.

5. Oxygen: Under strong light, when the light energy absorbed by plants is excessive, oxygen participates in the photooxidation of chlorophyll; Hypoxia does not synthesize chlorophyll.

It can be seen that the amount of chlorophyll content reflects whether the environment in which the plant grows is suitable, and whether the plant itself lacks mineral elements or water.

Chlorophyll: The main pigment in plants that carry out photosynthesis.

What influences the synthesis of chlorophyllLight is the main condition that affects the formation of chlorophyll. In addition to wavelengths above 680 nm, if the energy value is large enough, all wavelengths of light in visible light can promote the synthesis of chlorophyll. The effect of this factor was verified by experiments in which the green leaves turned yellow in the absence of light, and the yellow leaves turned green under light.

However, in vitro chlorophyll is easily decomposed under strong light.

Temperature. Temperature affects chlorophyll synthesis by affecting the activity of enzymes. In general, the minimum temperature for chlorophyll synthesis is 2 4 ° C, the optimal temperature is 30 ° C, and the maximum temperature is 40 ° C.

Mineral elements Mineral elements also have a great influence on the synthesis of chlorophyll. N and mg are components of the chlorophyll molecule, and the leaves turn yellow when they are missing. Fe, Mn, Cu, Zn, etc. are activators of certain enzymes in the process of chlorophyll formation, which play an indirect role in the formation of chlorophyll.

1. Light, light is the main condition affecting chlorophyll synthesis.

2. Temperature, which affects the enzymatic reaction.

3. Mineral elements, nitrogen and magnesium are its constituents, and iron, manganese, copper and zinc have catalytic or other effects in the synthesis process.

The chlorophyll content of leaves is carotene and chlorophyll b.

Because the type and content of photosynthetic pigments in green plant chloroplasts are closely related to the color change of plant leaves. The chloroplasts of green leaves are usually higher in chlorophyll than carotenoids. The chloroplasts of yellow-green leaves contain chlorophyll b but not chlorophyll a.

The chloroplasts of yellow leaves contain carotenoids but not chlorophyll. The reddening of leaves in autumn is due to the lack of chlorophyll stability. Therefore, the chlorophyll content of light green leaves includes carotene and chlorophyll b.

The main structure of the blades:

Leaves are the most important components of leaves, mostly thin green flat bodies, this thin and flat form, with a large surface area, can shorten the distance between mesophyll cells and the leaf surface, and the leaf veins that play a supporting and conductive role are also in a network state. These characteristics are conducive to gas exchange and light energy absorption, and are conducive to the transport of water and nutrients and the output of photosynthetic products.

It is a perfect adaptation to photosynthesis and transpiration. There are veins of different sizes distributed in the leaves, and along the longitudinal axis of the leaves, there is one of the most obvious veins called the main vein, and the rest of the veins are called lateral veins. Dicotyledons emit many lateral veins from the main vein to both sides, and the lateral veins then divide into thin veins, and the lateral veins and veins cross each other to form a network, which is called reticular veins.

The main veins of monocots are obvious, and the lateral veins emanate from the base to the tip of the leaf, and the veins of each leaf are parallel, which is called parallel veins. Some lower angiosperms, ferns and gymnosperms have bifurcated leaf veins to form forked veins, which are relatively primitive leaf veins.

Light is the main condition that affects the formation of chlorophyll. All wavelengths of visible light promote its synthesis, but the isolated chlorophyll is easily resolved under strong light.

Temperature affects chlorophyll synthesis by affecting the activity of enzymes. Generally, the minimum temperature is 2-4 degrees Celsius, the optimal temperature is 30 degrees Celsius, and the maximum temperature is 40 degrees Celsius.

Mineral elements. It also has a great influence on the synthesis of chlorophyll. Some of them are constituent elements of chlorophyll, and some are activators of enzymes.

Water scarcity not only affects synthesis, but also promotes decomposition.

Chlorophyll is not very stable, and light, acids, alkalis, oxygen, oxidants, etc., will decompose it. Under acidic conditions, the chlorophyll molecule easily loses the magnesium in the porphyrin ring and becomes demagnesium chlorophyll.

Chlorophyll, the main pigment for photosynthesis in plants, is a family of lipid-containing pigments located in the thylakoid membrane. Chlorophyll absorbs most of the red and violet light but reflects green light, so chlorophyll is green, and it plays a central role in the light absorption of photosynthesis. Chlorophyll is a magnesium porphyrin compound, including chlorophyll a, b, c, d, f, prochlorophyll and bacterial chlorophyll.

There are two main types of chlorophyll in chloroplasts of higher plants: chlorophyll a and chlorophyll b. They are insoluble in water while soluble in organic solvents such as ethanol, acetone, ether, chloroform, etc. Chlorophyll a molecular formula:

c55h72o5n4mg；Chlorophyll b molecular formula: C55H70O6N4MG In color, chlorophyll a is blue-green, while chlorophyll b is yellowish-green.

Photosynthesis refers to the process in which green plants convert light energy into chemical energy with carbon dioxide and water through chloroplasts, store it in organic matter, and release oxygen. The first step in photosynthesis is the absorption of light energy by chlorophyll and ionization of chlorophyll. The chemical energy produced is temporarily stored in adenosine triphosphate (ATP) and eventually converts carbon dioxide and water into carbohydrates and oxygen.

The various colors of pigmented vegetables are made up of pigments. Chlorophyll is the pigment that forms green, and it is produced in response to sunlight. Spinach and rape contain more chlorophyll.

Chlorophyll is an unstable substance that is insoluble in water and soluble in alcohol. Chlorophyll is easily destroyed by acids and turns dark green or yellow-green. Vegetables such as carrots, tomatoes, and red peppers have yellow, red, and orange pigments.

The reason why other green vegetables also contain yellow, red, orange and other colors is that these vegetables are rich in carotene, lycin and lutein.

1. Light, light is the main condition that affects chlorophyll synthesis.

2. Temperature, shadow spike file enzymatic reaction.

3. Mineral elements, nitrogen and magnesium are its constituent components, and iron, manganese, copper and zinc have catalytic or other effects in the synthesis process.