Photosynthesis rate measurement method in literature

Photosynthesis rate measurement method in literature

The main reason for the photosynthetic rate of plants is that the leaf photosynthetic rate appears “low-high-low” with the growth of leaf age, but with the growth of young leaves, the development of chloroplasts, chlorophyll content and Rubisco enzyme activity increase, when the leaf length When the area and thickness were maximum, the photosynthetic rate usually reached the maximum value. Later, with the leaf senescence, the chlorophyll content and Rubisco enzyme activity decreased, and the chloroplast internal structure disintegrated, the photosynthetic rate decreased. The calculation of chlorophyll content in plants is calculated using the chlorophyll meter.

The photosynthetic rates reported in most of the current literature are expressed in terms of unit leaf area. Using the photosynthetic rate expressed by the leaf area per unit and related parameters, the leaf area can be measured with the help of a professional measuring instrument. The portable leaf area meter is a good instrument. For example, the contents of leaf chlorophyll, photosynthetic products, and enzyme activity not only facilitate the comparison of different literature data, but also facilitate the comprehensive analysis of the relationship between various parameters, including their causal and quantitative relationships. Expressing the relevant parameters in terms of fresh leaf fresh weight is the most unacceptable practice because various parameters expressed in this unit are easily affected by changes in leaf water content, especially when different moisture treatments are involved. Measured in the way to take into account the changes in the soil moisture content, you can use the soil moisture monitoring system to measure, in the consideration of the environment variable factors, such as light intensity, carbon dioxide concentration, and temperature and humidity, etc. Certainty and incomparability are even greater. It is also problematic to express photosynthetic and some related indicators in terms of dry weight per leaf. Although they are not affected by changes in leaf water content, they are affected by different amounts of photosynthetic product accumulated between different treatments or at different times of the day.

Personally feel that the measurement of photosynthetic rate is not absolute which method is correct, each measurement method is measured from different angles, and at the same time, there are many variable factors in each measurement process. The results of the measurements are all qualitative.