Which can explain the light response in plant physiology?

In plant physiology, light response (or light response) refers to the reaction and response of plants to light. Specifically, it is mainly concerned with how plants absorb the sun's rays through photosynthetic pigments such as chlorophyll and convert them into energy for further use in photosynthesis and other metabolic processes.

Chlorophyll mainly absorbs red and blue-violet light, and absorbs less light such as green and yellow light. After absorbing the sun's rays, the chlorophyll molecule is excited to an excited state, and then through a series of electron transfer processes, the chemical energy is converted into active chemical energy, which is stored in the form of NADPH and ATP. These intermediates can further participate in dark reactions to synthesize organic substances such as glucose, etc.

In addition, the response of plants to light is not limited to photosynthesis. When there is not enough light, plants may make the most of the light source by changing their morphological structure; When the light is too strong, the plant will prevent light damage by producing sunburn and other things.

Overall, light response is a complex and extremely important area of plant physiology, which plays a key role in plant growth, development, and ecosystem function.

The active chemical energies Nadph and ATP converted from light in the light reaction of photosynthesis can assimilate CO2 in the dark reaction, so it is called photocontracting.

Yield is directly related to the intensity of the given actinic light, when the ML setting is higher, its intensity may have been able to cause photosynthesis of algae, that is to say, it has the effect of actinic light, and the measured FV FM is not the real FV FM, but the yield.

The stronger the light, the yield; The weaker the light, the higher the yield; When the light is so weak that there is none, the yield becomes fv fm

Yes, this model of instrument can be used for greenhouse culture, field leaf research, horticulture, viticulture, crop disease assessment and environmental assessment. In fact, it is mainly used for field research, and can achieve non-destructive measurements. Moreover, the data can be recorded directly in memory, which is easy to transfer and perform simple analysis.

Analysis of factors affecting photosynthesis: 1. Internal factors Different plant species have different rates of photosynthesis. The rate of photosynthesis is different at different stages of growth and development of the same leaf.2. External factors Photosynthesis is a photobiochemical reaction, so the photosynthetic rate accelerates with the increase of light intensity.

But beyond a certain range, the increase in photosynthetic rate slows down until it no longer increases. The photosynthetic rate can be measured in terms of co?The amount of absorption is expressed as co?

The greater the absorption, the faster the photosynthetic rate. Carbon dioxide co?It is the raw material for photosynthesis of green plants, and its concentration affects the progress of the dark reaction of photosynthesis.

Increase the CO within a certain rangecan increase the rate of photosynthesis, co?The rate of photosynthesis does not increase after a certain concentration is reached, because the products of the photoreaction are limited.

The effects of temperature on photosynthesis are complex. Since photosynthesis includes two parts, light reaction and dark reaction, light reaction mainly involves photophysical and photochemical reaction processes, especially the steps that are directly related to light, excluding enzymatic reactions, so the light reaction part is less affected by temperature, or even not affected by temperature;The dark reaction is a series of enzymatic reactions, which are obviously affected and restricted by temperature changes. When the temperature is higher than the optimal temperature for photosynthesis, the photosynthetic rate obviously decreases with the annual increase of temperature, which is due to the passivation, denaturation and even destruction of the relevant enzymes that catalyze the dark reaction caused by high temperature, and the high temperature will also lead to the change and damage of chloroplast structureThe high temperature exacerbates the respiration of plants, and the solubility of carbon dioxide decreases more than the solubility of oxygen, which is conducive to photorespiration and not conducive to photosynthesisAt high temperatures, the transpiration rate of the leaves increases, and the leaves lose water seriously, resulting in the closure of the stomata and the lack of carbon dioxide, and the combined effect of these factors will inevitably lead to a sharp decrease in the photosynthetic rate.

When the temperature rises to the thermal limit, the net photosynthetic rate drops to zero, and if the temperature continues to rise, the leaves will wilt and even dry up and die due to severe water loss. Mineral ElementsMineral elements directly or indirectly affect photosynthesis. For example, N is the element that makes up the compounds of chlorophyll, enzymes, ATP, P is the element that makes up ATP, and Mg is the element that makes up chlorophyll.

Water moisture is not only one of the raw materials for photosynthesis, but also can affect the opening and closing of leaf stomata and indirectly affect the co?of absorption. The lack of water decreases the photosynthetic rate.

Plant physiology is the study of plant life activities. Its main task is to study and elucidate the laws and mechanisms of plant life activities under various environmental conditions, and to apply these research results to production practice and serve agricultural production.

Relationship with agriculture:

The research on mineral nutrition has laid the foundation for chemical fertilizer production, provided a new method of soilless cultivation, and contributed to the rational fertilization and improvement of crop yield.

The study of photosynthesis provides a theoretical basis for intercropping, multi-cropping cultivation, rational dense planting, dwarfing and high light efficiency breeding in agricultural production. The research on plant hormones has promoted the artificial synthesis and application of growth regulators and herbicides, and brought the growth and development of crops into the era of chemical regulation.

The discovery and research of vernalization and photoperiod phenomena have a guiding effect on cultivation, introduction and breeding.

The development of tissue culture technology has realized the prediction of "cell totipotency", provided a foundation for the development of new breeding methods such as anther breeding, protoplast culture, cell hybridization and fusion, and gene introduction, and provided a reliable way for rapid reproduction, virus removal and industrial production of plant drugs.

This is the photochemical conversion of photosensitic pigments, since the change of its ratio is used to explain the regulatory mechanism of flowering in plants

The English word for photochromin is DAO Phytochrome, i.e. P, Red Light, Far Red Light, simplified to the subscripts in the lower right corner, fr and r.

Photosynthesis absorbs light energy and converts it into chemical energy Respiration releases and converts the chemical energy stored in organic matter into various forms of energy.