原创《增强UV—B辐射对2个烤烟品种生理代谢指标影响》：本文关于烤烟论文范文,可以做为相关论文参考文献,与写作提纲思路参考。
摘 要 在大田栽培和自然条件下,研究人工模拟2种UV-B辐射（308 nm,1.83 kJ/m2,1.06 kJ/m2）对烤烟红花大金元品种和云烟87品种叶片光合色素、酶活性及4种代谢产物积累的影响.结果表明：增强UV-B辐射可减少红花大金元叶片光合色素含量,降低过氧化物酶（POD）的活性,增强过氧化氢酶（CAT）和硝酸还原酶（NR）的活性,促进可溶性蛋白质（SP）和丙二醛（MDA）的积累；UV-B强度较低时可增强其超氧化物歧化酶（SOD）和多酚氧化酶（PPO）的活性,促进紫外吸收物质的积累.对于云烟87来说,增强UV-B辐射可增加其光合色素含量,增强3种抗氧化酶和NR酶的活性,促进SP的积累,降低紫外吸收物质的含量；低强度的UV-B辐射可增强PPO的活性,显著提高MDA和SP的含量.
关键词 烤烟；UV-B辐射；光合色素；酶活性；代谢产物
中图分类号 S572 文献标识码 A
Effect of Enhanced Ultraviolet-B on the Indices of Main Physiological Metabolism of Two Flue-cured Tobacco Varieties
SHAO Jianping1, YANG Zhixin2*, HE Chenggang3, WANG Yanxia1, HU Debo4
1 Qujing City Branch Luoping Tobacco Company, Luoping, Yunnan 655800, China
2 College of Resources and Environment, Yunnan Agricultural University, Kunming, Yunnan 650201, China
3 College of Tobacco Science, Yunnan Agircultural University, Kunming, Yunnan 650201, China
4 Zhaotong Soil and Fertilizer Station, Zhaotong, Yunnan 657000, China
Abstract Field experiments were conducted to study the effect of enhanced ultraviolet-B（UV-B,308 nm,1.83 kJ/m2 and 1.06 kJ/m2, respectively）radiation on the content of photosynthetic pigments, enzyme activity and the accumulates of four metabolic products of two flue-cured tobacco cultivars（Hongda and Yunyan87） under natural light conditions. The results showed that enhanced ultraviolet-B radiation could reduce the photosynthetic pigment content of Hongda, reduce peroxidase（POD） activity, enhance the catalase（CAT）and nitrate reductase（NR）activity, promote the accumulation of protein and malondialdehyde content（MDA）. Low-intensity ultraviolet-B radiation could enhance superoxide dismutase（SOD） and polyphenol oxidase（PPO） activity and promote the accumulation of UV-absorbing compounds. As for Yunyan 87, enhanced ultraviolet-B radiation could increase the content of photosynthetic pigments, enhance the three kinds of antioxidant enzymes and NR activity, promote the accumulation of pro and reduce the content of UV-absorbing compounds. Low-intensity ultraviolet-B radiation could enhance the PPO activity of Yunyan 87, significantly enhanced the content of pro and MDA.
Key words Flue-cured tobacco；UV-B radiation；Photosynthetic pigments；Enzyme activity；Metabolic product
doi 10.3969/j.issn.1000-2561.2015.01.022
云南是中国优质烟叶产区,平均海拔2 000 m左右,紫外辐射强度随海拔高度的增加呈规律性递增[1].在UV-B的辐射下,许多敏感植物的生长和生物量累积都有明显的降低[2],这说明植物的光合作用受到了抑制.已有研结果表明,UV-B增加导致光合作用受阻,主要包括光损伤、光抑制、光氧化3个方面,类胡萝卜素在植物光合作用中担负着光吸收辅助色素的重要功能,具有吸收和传递电子的能力,可清除紫外胁迫下光合作用中产生的叶绿素三线态、单线态及超氧阴离子等自由基[3-4],对植物有重要的保护作用.一般认为,UV-B胁迫通常导致植物体内活性氧代谢发生紊乱,从而造成机体受到的活性氧损伤加重,膜系统被破坏,影响一系列的生理代谢过程[5].
烤烟论文参考资料：
结论：增强UV—B辐射对2个烤烟品种生理代谢指标影响为关于烤烟方面的的相关大学硕士和相关本科毕业论文以及相关种植什么最赚钱论文开题报告范文和职称论文写作参考文献资料下载。
