RUDN University biologist developed new model for analyzing photosynthesis in vivo

RUDN University biologist developed new model for analyzing photosynthesis in vivo

A RUDN University biologist has developed a model for the analysis of photosynthesis in vivo. This method allows you to calculate the absorption coefficient of light by chlorophyll, based on its reflectivity. Analysis of light absorption is important for assessing ecosystem productivity, which affects the state of the biosphere and the global climate.

Measurements of the efficiency of photosynthesis in living systems are necessary because they allow us to estimate the carbon cycle, and therefore the impact on the climate. To study photosynthesis in vivo, the vegetation absorption coefficient is used – a value that shows how deep the incident radiation penetrates the canopy. It depends on biochemical, structural and external factors, so its evaluation is very difficult. Alexei Solovchenko, an employee of RUDN University, and his colleagues from the USA and Israel have found a new way to assess this indicator.

First, biologists calculated the ratio of absorption and transmission coefficients for individual leaves and canopy in general. Measuring these coefficients for the canopy “in sum” is difficult, but for a single leaf it is simple, so knowing the ratio between them, you can calculate the absorption and transmission of canopy, knowing the coefficients for a single leaf. Then the researchers of RUDN University obtained an equation that connects the canopy absorption coefficient to the pigments absorption coefficient – primarily chlorophyll – in leaves. It turned out that the canopy, unlike a single leaf, can absorb light in the infrared range, and also, the absorption coefficients of pigments for plants with different densities of canopy, may differ. Therefore, biologists had to make appropriate changes to the final model.

The researchers tested this mathematical model describing the canopy absorption coefficient on crops with different types of photosynthesis – corn (C4 photosynthesis), soybeans and rice (C3 photosynthesis), measuring the spectra of absorbed and reflected solar radiation.

The model showed that in the blue spectral region, the canopy of rice reflects more than the canopy of other crops. Scientists believe it is because rice grows in water. Also, absorption curves for plants with C3 type of photosynthesis (soybeans and rice) obtained with the model differed from those of plants with C4 type of photosynthesis (corn), due to biochemical differences.

Thus, the model created by biologists can "predict" the absorption of light by different types of plants with different types of photosynthesis, different canopy architectures and different pigment content in the leaf.

The article is published in the journal Remote Sensing of Environment.

News
All news
Science
16 Mar
RUDN Research Institute of Molecular and Cellular Medicine is the winner of the Mega-grant of the Russian Science Foundation for 128 million rubles

RUDN University is one of the three winners in the country. The Scientific Research Institute of Molecular and Cellular Medicine of RUDN Institute of Medicine will become a clinical base for a 4-year project in the field of genetic research for the treatment of soft tissue sarcomas.

Science
15 Mar
The chemist RUDN created a catalyst for more efficient oxidation of cyclohexane

The chemist of RUDN together with colleagues from Iran and Spain created a catalyst based on palladium and nickel for the oxidation of cyclohesane in the production of adipic acid, which is used for the production of cleaning products, food dyes and other substances. The new catalyst made it possible to double the consumption of cyclohexane.

Science
10 Mar
Intercultural communication in the context of global integration and the fourth industrial revolution

On February 28, 2023, invited lector Dương Thu Hằng (Head of Department of Vietnamese Literature, Faculty of Philology, Thai Nguyen University, Vietnam) gave lecture entitled “Intercultural communication in the context of global integration and the fourth industrial revolution” within the framework of academic and methodological online seminar of the Foreign Languages Department of the Agrarian and Technological Institute of RUDN University. The lecture was held online via Microsoft Teams. Languages — the Vietnamese language, the English language & the Russian language.