| Biology and Soil |
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| Effects of NO on Contents of Cell Wall Polysaccharides Fraction under Enhanced UV-B Radiation |
| QU Ying1, WANG Yi-bo2, JIN Wen-jie1, LI Wen-jian1, AN Li-zhe3 |
1.Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;
2.School of Life Science and Chemistry, Tianshui Normal University, Tianshui 741000, Gansu, China;
3.School of Life Science, Lanzhou University, Lanzhou 730000, China |
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Abstract Effects of nitric oxide (NO) on contents of cell wall polysaccharides fraction in stems of pea (Pisum sativum）seedlings under enhanced UV-B radiation were studied. Results showed that total contents of cell wall polysaccharides, and contents of pectin, hemicellulose I, hemicellulose II and celluloses at pea seedling stems per unit length increased under UV-B radiation. NO donor treatment also increased contents of hemicellulose I, hemicellulose II and celluloses at pea seedling stems per unit length. Under UV-B radiation treatments, the additional inhibitor of nitric oxide synthase and NO scavenger abated the effects of UV-B radiation on contents of hemicellulose I, hemicellulose II and celluloses, making their contents decreased. It is believed that UV-B radiation, with NO as a probable signaling molecule, can increase the contents of hemicellulose I, hemicellulose II and celluloses. So their proportions among cell wall polysaccharides increase too. These changes might regulate the chemical properties and mechanical ductility of cell wall. Whether NO donor treatment under control condition, or NOS inhibitor and NO scavenger treatments under UV-B radiation had no effects on contents of pectin, which suggest that the effect of NO signaling on increase of pectin contents induced by UV-B radiation can be excluded.
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Received: 28 February 2012
Published: 20 September 2012
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2012, Vol. 32 
