Effects of silicon application on diurnal variations of physiological properties of rice leaves of plants at the heading stage under elevated UV-B radiation

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• 作者：Yun-sheng Lou ; Lei Wu ; Ren Lixuan ; Yan Meng…
• 关键词：UV ; B radiation ; Silicon application ; Rice ; Photosynthesis ; Transpiration
• 刊名：International Journal of Biometeorology
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：60
• 期：2
• 页码：311-318
• 全文大小：317 KB
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• 作者单位：Yun-sheng Lou (1)
  Lei Wu (1)
  Ren Lixuan (2)
  Yan Meng (1)
  Zhao Shidi (1)
  Zhu Huaiwei (1)
  Zhang Yiwei (1)
  
  1. Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology, Nanjing, 210044, China
  2. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Life Sciences
  Animal Physiology
  Plant Physiology
  Environmental Medicine/Environmental Psychology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1254

文摘

We investigated the effects of silicon (Si) application on diurnal variations of photosynthetic and transpiration physiological parameters in potted rice (Oryza sativa L. cv Nanjing 45) at the heading stage. The plants were subjected to two UV-B radiation levels, i.e., reference UV-B (A, ambient, 12.0 kJ m−2 day−1) and elevated UV-B radiation (E, a 20 % higher dose of UV-B than the reference, 14.4 kJ m−2 day−1), and four Si application levels, i.e., Si₀ (no silicon supplementation, 0 kg SiO₂ ha−1), Si₁ (sodium silicate, 100 kg SiO₂ ha−1), Si₂ (sodium silicate, 200 kg SiO₂ ha−1), and Si₃ (slag silicon fertilizer, 200 kg SiO₂ ha−1). Compared with the reference, elevated UV-B radiation decreased the diurnal mean values of the net photosynthetic rate (Pn), intercellular carbon dioxide (CO₂) concentration (Ci), transpiration rate (Tr), stomatal conductivity (Gs), and water use efficiency (WUE) by 11.3, 5.5, 10.4, 20.3, and 6.3 %, respectively, in plants not supplemented with silicon (Si₀), and decreased the above parameters by 3.8–5.5, 0.7–4.8, 4.0–8.7, 7.4–20.2, and 0.7–5.9 %, respectively, in plants treated with silicon (Si₁, Si₂, and Si₃), indicating that silicon application mitigates the negative effects of elevated UV-B radiation. Under elevated UV-B radiation, silicon application (Si₁, Si₂, and Si₃) increased the diurnal mean values of Pn, Ci, Gs, and WUE by 16.9–28.0, 3.5–14.3, 16.8–38.7, and 29.0–51.2 %, respectively, but decreased Tr by 1.9–10.8 %, compared with plants not treated with silicon (E+Si₀), indicating that silicon application mitigates the negative effects of elevated UV-B radiation by significantly increasing the P _n, C _i, G _s, and WUE and decreasing the T _r of rice. Evident differences existed in mitigating the depressive effects of elevated UV-B radiation on diurnal variations of physiological parameters among different silicon application treatments, exhibiting as Si₃>Si₂>Si₁>Si₀. In addition to recycling steel industrial wastes, the application of slag silicon fertilizer mitigates the negative effects of elevated UV-B radiation on photosynthesis and transpiration in rice. Keywords UV-B radiation Silicon application Rice Photosynthesis Transpiration