Illumination has a great influence on the photosynthesis of Annona squamosa leaf. The most important factor in photosynthesis is the illuminance. In agricultural production, we usually use temperature illuminance recorders, temperature illuminance recorders and other recorders to determine the intensity of light in the environment. Temperature illuminance recorder can measure two parameters at the same time: temperature and illuminance, it is a more commonly used recorder. Temperature illuminance recorder combined with wind anemometer, carbon dioxide recorder, etc., can detect multiple environmental parameters, allowing us to more fully understand the meteorological conditions. This paper mainly analyzes the effect of light intensity on the photosynthesis of sweetsopsis leaves.
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The photosynthetic rate of the leaves of 'Pride of Africa' (P. africana) seedlings measured under various treatments conditions decreased with the decrease of illumination in the development environment, but the difference was not significant. On the one hand, the RuBiscol activity of chloroplasts under non-extremely weak light may be relatively low. With high stability, the light system II of the plant leaves is not destroyed, but the activity is enhanced, the original light energy conversion rate is increased, and the low light increases the content of total leaf chlorophyll, chlorophyll b and carotenoids of the leaf, thereby increasing the light capture of the leaf On the other hand, it may be because the “African Pride†sapling seedlings have a greater range of adaptation to the light, and the shading conditions in the experiment have not yet reached a level that makes the photosynthetic ability significantly different from the natural light intensity.
The stomatal conductance of leaves developed under natural illumination was significantly higher than that of leaves developed under vegetative treatment. The transpiration rate of leaves was significantly higher than that of the two cover treatments. There was no significant difference among other treatments. After 1d of cultivation, the photosynthetic rate, transpiration rate and stomatal conductance of the leaves of Annona squamosa were significantly or extremely reduced with the decrease of the illuminance during the development of the leaves. Among them, the decrease of the photosynthetic rate treated by the shading 1 shade net is accompanied by the decrease of Ci and the increase of the stomatal limit value L, which may be the result of stomatal limitation. Reduced stomatal conductance leads to a decrease in transpiration rate and limits the amount of CO exchange, thus reducing the photosynthetic rate. However, the photosynthetic rate of the leaves treated with the shading layer 2 decreased, and the concentration of CO in the intercellular spaces increased. This should be caused by non-stomatal restriction. Severe changes in illuminance may cause damage to the photosynthetic system of the leaves formed under over-shadowing conditions, causing a decrease in photosynthetic rate.