光氮互作对烤烟光合作用及叶绿素荧光特性的影响

doi:10.3864/j.issn.0578-1752.2010.05.006

中国农业科学 ›› 2010, Vol. 43 ›› Issue (5): 932-941 .doi: 10.3864/j.issn.0578-1752.2010.05.006

光氮互作对烤烟光合作用及叶绿素荧光特性的影响

云菲,刘国顺,史宏志,宋晶

（河南农业大学烟草学院/国家烟草栽培生理生化研究基地）

收稿日期:2009-06-09 修回日期:2009-07-29 出版日期:2010-03-01 发布日期:2010-03-01
通讯作者: 刘国顺

Effects of Light and Nitrogen Interaction on Photosynthesis and Chlorophyll Fluorescence Characteristics in Flue-Cured Tobacco

YUN Fei, LIU Guo-shun, SHI Hong-zhi, SONG Jing

（河南农业大学烟草学院/国家烟草栽培生理生化研究基地）

Received:2009-06-09 Revised:2009-07-29 Online:2010-03-01 Published:2010-03-01
Contact: LIU Guo-shun

摘要/Abstract

摘要：

【目的】揭示光照强度和氮素水平对烤烟光合作用及叶绿素荧光参数的调控效应,探明适宜烤烟生长的最佳光氮条件。【方法】以烤烟品种“豫烟5号”为供试材料,采用4种光照强度和3种氮素水平的复因子盆栽试验,研究光氮互作对烤烟光合及荧光特性的影响。【结果】降低光强和增施氮肥能够显著提高烤烟叶片光合色素含量。同一光强下中等施氮水平的烤烟叶片净光合速率(Pn)、蒸腾速率(Tr)、胞间CO2浓度(Ci)以及光能转化效率(LUE)最高。适当增施氮肥有利于烟株降低非辐射能量耗散,将更多的吸收光能用于光化学反应,弱光下随施氮量增加烤烟的PSⅡ实际光化学效率 (ФPSⅡ)、光化学淬灭系数(qP)、PSⅡ最大光化学效率(Fv/Fm)、PSⅡ潜在活性(Fv/Fo)均升高。在同一光照水平下增施氮肥及在同一施氮水平下70%的光照强度可提高烟株的光合生产能力及干物质积累量,小于50%的光照强度不利于烟株生长。【结论】光氮互作效应对烤烟光合生理指标的影响显著,在同一氮素水平下减弱光照（70%光照强度）和在弱光条件下增施氮肥（N2,3.5g/盆）,能够有效地改善烟株的光合性能,提高其光能利用率,促进光合产物的形成和积累。

关键词: 光照强度, 氮素, 烤烟, 光合, 叶绿素荧光

Abstract:

【Objective】 In order to reveal the regulating effects of light and nitrogen under different conditions on photosynthesis and chlorophyll fluorescence parameters and elucidate the feasible combination of light and nitrogen for better growth of flue-cured tobacco. 【Method】 With Yuyan 5 as experimental material, a pot experiment was carried out in 2008, two elements including light intensity (four levels) and nitrogen supply (three treatments) were conducted to study the interation effects of light and nitrogen on photosynthesis and chlorophyll fluorescence characteristics in flue-cured tobacco. 【Result】 The content of pigments (chl, car) in flue-cured tobacco leaves were significantly increased with the increase of nitrogen and shading. Compared to low-nitrogen and high-nitrogen treatments, under the condition of mid-nitrogen, the values of net photosynthetic rate (Pn), transpiration rate (Tr), intercellular CO2 concentration (Ci) and the light use efficiency (LUE) were the highest. The results showed that there was a positive correlation between nitrogen and chlorophyll fluorescence parameters. The application of nitrogen could contribute to reduce energy dissipation of non-radiation so that large light energy could allocate to photochemical reaction. The actual photochemical efficiency (ФPSⅡ), photochemical quenching coefficient (qP), maximum photochemical efficiency (Fv/Fm) and the PSⅡ potential activity (Fv/Fo) increased with the increase of nitrogen and shading. The photosynthetic capacity and the amount of dry matter accumulation were promoted when the light level at 70% natural light transmittance, but under less than 50% natural light intensity had negative effects on dry matter accumulation. 【Conclusion】 Light, nitrogen and their interactions had a significant influence on photosynthetic physiology index of flue-cured tobacco. With 70% natural light intensity (in this experiment), proper application of nitrogen (N2, 3.5 g/pot in this experiment) could improve the degree of utilization of light energy and increase the amount of dry matter accumulation in flue-cured tobacco.

Key words: light intensity, nitrogen, flue-cured tobacco (Nicotiana tobacum L.), photosynthesis, chlorophyll fluorescence

云菲,刘国顺,史宏志,宋晶 . 光氮互作对烤烟光合作用及叶绿素荧光特性的影响[J]. 中国农业科学, 2010, 43(5): 932-941 .

YUN Fei,LIU Guo-shun,SHI Hong-zhi,SONG Jing
. Effects of Light and Nitrogen Interaction on Photosynthesis and Chlorophyll Fluorescence Characteristics in Flue-Cured Tobacco
[J]. Scientia Agricultura Sinica, 2010, 43(5): 932-941 .

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光氮互作对烤烟光合作用及叶绿素荧光特性的影响

Effects of Light and Nitrogen Interaction on Photosynthesis and Chlorophyll Fluorescence Characteristics in Flue-Cured Tobacco

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