Effects of shading on morphology, photosynthesis characteristics, and yield of different shade-tolerant peanut varieties at the flowering stage.

3.3 Effect of shade on chloroplast pigment content of peanut at the flowering needle stage Compared with that in the control, the chlorophyll a content in the leaves of different shade-tolerant peanut varieties showed an increasing trend under shade stress at the flowering stage.

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3.4 Effect of shade on photosynthesis of peanut at the flowering needle stage 3.4.1 Photosynthetic physiological parameters Under shade stress at the flowering stage, the net photosynthetic rates of different shade-tolerant varieties were lower than those of the control, and the net photosynthetic rates of HY22 decreased highly significant only at 50 days of shade, with 32.80% ( Figure 9A ).

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