Researches on photosynthesis of fruit trees have been deepened both at home and abroad, especially in the study of photosynthesis of deciduous fruit trees. There is still a lack of systematic research on photosynthetic characteristics of sweet oranges, especially under natural conditions. The purpose is to explore the properties of photosynthetic production under natural conditions. Find out the measures to make full use of the potential of photosynthesis to provide theoretical references, and lay the foundation for further research on the mechanism of citrus photosynthesis. Photosynthesis is the most important light, and the accumulated light calculation software can calculate light, providing more convenience for research.
There have been many studies on the daily changes in photosynthesis, which have been classified into four types: regular curve type, flat type, variable power type, and noon reduction type. This study shows that Jinyang is a reduced type at noon, but the sunny days have a lower a-degree and longer duration than the nocturnal photosynthetic performance. Obviously it is due to strong sunshine and radiation (visible from the amount of accumulated light) at noon on sunny days, which results in overheating of the leaves, imbalance of water metabolism, stomatal closure, increased CO2 input resistance, and decreased efficiency of peroxidation, resulting in photosynthetic disturbance of the leaves. In addition, studies have found that there is also a midday decrease in C concentration. In summary, in the natural state, the high temperature associated with strong sunlight and the photosynthetic physiological barrier caused by the water deficit of p-b-tablet are combined with the higher degree of internal regulation, which is a further increase in the midday photosynthesis depression. the reason.
Through the calculation of accumulated light calculation software and rigorous research on plants, it has been found that changes in photosynthetic properties of the interior and exterior of the canopy are closely related to climatic conditions. Citrus is a kind of low-light-resistance plants with strong resistance to negative. Both light and high temperature can cause photosynthetic disturbance in leaves, which makes the sunny day outside the crown, the extra-canopy photosynthetic efficiency is lower than that inside the crown, and the cloudy outside is higher than the inside of the crown. This is because the leaves and leaves relatively reduce the radiation caused by strong light to the inner leaves of the crown.
There have been many studies on the daily changes in photosynthesis, which have been classified into four types: regular curve type, flat type, variable power type, and noon reduction type. This study shows that Jinyang is a reduced type at noon, but the sunny days have a lower a-degree and longer duration than the nocturnal photosynthetic performance. Obviously it is due to strong sunshine and radiation (visible from the amount of accumulated light) at noon on sunny days, which results in overheating of the leaves, imbalance of water metabolism, stomatal closure, increased CO2 input resistance, and decreased efficiency of peroxidation, resulting in photosynthetic disturbance of the leaves. In addition, studies have found that there is also a midday decrease in C concentration. In summary, in the natural state, the high temperature associated with strong sunlight and the photosynthetic physiological barrier caused by the water deficit of p-b-tablet are combined with the higher degree of internal regulation, which is a further increase in the midday photosynthesis depression. the reason.
Through the calculation of accumulated light calculation software and rigorous research on plants, it has been found that changes in photosynthetic properties of the interior and exterior of the canopy are closely related to climatic conditions. Citrus is a kind of low-light-resistance plants with strong resistance to negative. Both light and high temperature can cause photosynthetic disturbance in leaves, which makes the sunny day outside the crown, the extra-canopy photosynthetic efficiency is lower than that inside the crown, and the cloudy outside is higher than the inside of the crown. This is because the leaves and leaves relatively reduce the radiation caused by strong light to the inner leaves of the crown.
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