Photosynthetica 2013, 51(1):151-157 | DOI: 10.1007/s11099-013-0007-4

Chlorophyll content and photosystem II efficiency in soybean exposed to supplemental ultraviolet-B radiation

Z. Hu1,2,*, H. Li1, S. Chen1, Y. Yang1
1 Yale-NUIST Center on Atmospheric Environment & School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, China
2 Key Laboratory of Agrometeorological Safeguard and Applied Technique, China Meteorological Administration, Zhengzhou, China

Chlorophyll (Chl) a fluorescence parameters and rapid light curves of soybean [Glycine max (L.) Merrill] were measured by pulse amplitude modulation fluorometry. Measurements were taken during different stages of soybean growth under field conditions with 20% enhancement in ultraviolet-B (UV-B) radiation. Results showed that supplemental UV-B radiation decreased Chl contents by 5.5% (P=0.048), 8.7% (P=0.046), and 10.5% (P=0.005) in seedling, in branching-flowering, and in pod-setting stages, respectively. In the branching-flowering and pod-setting stages, maximum quantum yield of photosystem (PS) II photochemistry (Fv/Fm) decreased by 6.1% (P=0.001) and 3.0% (P=0.009), respectively. Supplemental UV-B radiation significantly decreased the effective quantum yield (Y). The photosynthetic capacity at light saturation (Pm) also decreased in both the seedling and branching-flowering stages by 28.9% (P=0.007) and 15.5% (P=0.041), respectively. However, Y and Pm showed no significant difference in the trefoil and pod-setting stages with and without the UV treatment. The light saturation parameter (E k) decreased by 21.1% (P=0.000) and 23.2% (P=0.029) in the trefoil and seedling stages, respectively. Moreover, the initial slope (α) decreased by 21.1% (P=0.001) in the branching-flowering stage. Nonphotochemical quenching (NPQ) in the seedling stage and photochemical quenching coefficient (qp) in the branching-flowering stage decreased significantly under UV-B treatments. The results of the present study suggest that supplemental UV-B radiation adversely affected Chl content and electron transport activity in PSII and consequently decreased the photosynthetic efficiency of soybean plants.

Additional key words: chlorophyll content; fluorescence quenching; Glycine max; rapid light curves; ultraviolet-B radiation

Received: June 24, 2011; Accepted: November 16, 2012; Published: March 1, 2013  Show citation

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Hu, Z., Li, H., Chen, S., & Yang, Y. (2013). Chlorophyll content and photosystem II efficiency in soybean exposed to supplemental ultraviolet-B radiation. Photosynthetica51(1), 151-157. doi: 10.1007/s11099-013-0007-4
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