Effects of Shading Treatments on Characteristics of Leaf Growth, Photosynthesis and Its Related Traits in Rice

This study aimed to investigate the effects of shading treatments on characteristics of leaf growth (specific leaf area, surface area, SPAD), photosynthesis (light-photosynthesis curve) and its related traits in rice. The rice was planted in 1/5,000 a wagner pot to investigate the after effect of shading (56% of sun light) on the photosynthetic activity at heading stage. The SLA (specific leaf area) and surface leaves were increased and more at flag leaves than lower leaves by the shading treatment. The shaded leaves of plant had a higher value in SPAD as compared with non-shaded leaves of plant. Shading at the heading stage increased photosynthetic rates of leaves positioned on each part of the stem as compared with the non-shaded plants.