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浙江大学学报（农业与生命科学版）
Journal of Zhejiang University: Agric. & Life Sci.  2011, Vol. 37 Issue (2): 187-192    DOI: 10.3785/j.issn.1008-9209.2011.02.011
Agricultural sciences     
Relationship between net photosynthetic rate of flue-cured tobacco and its physio-ecological factors
ZHANG Guang-fu,ZHAO Ming-qin,HAN Fu-gen,Lv  Zhong-xian,LIU Le,YAN Yong-sheng
College of Tobacco Science , Henan Agricultural University , Zhengzhou 450002 , China
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Abstract  The diurnal changes of net photosynthetic rate (Pn) in leaves of tobacco cultivar "JiyanNO.9"were studied by LI -6400 portable photosynthesis system,and the relationship between the Pnandits physio-ecological factors was studied by principal components and path analysis. The results showed that the curve of diurnal variation of Pn was demonstrated single peak in clear day, and the majority of peak presented to 11:00, which was  9.88 μmol.m -2. s -1, and it did not show midday depression; the diurnal changes of stomatal conductance (Gs) , transpiration rates (Tr) , leaf temperature  ( TL ) and air temperature ( Ta )  all appeared as single peak curves,and there were positive relationships between Gs, Tr, TL , Ta andPn; TL and Tr were the major ones in diurnal change of physiological factors, and TL ,Ta and Ca were the major ones in diurnal change of ecological factors; the direct impact of physiological factors to Pn was the order of Gs ＞ TL＞ Tr ＞ Ci ,and the direct impact of ecological factors to Pn was the order of TL＞ Ta＞ relative humidity (RH) ＞ Ca＞ photosynthetically active radiation (PAR) .Comprehensive analysis showed  that Gs,Tr and TL played very important rolesin the changes of Pn among the physiological factors, and light and temperature affected the changes of Pn among the ecologicalfactors.

Published: 25 March 2011
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LIU Le
YAN Yong-sheng
ZHANG Guang-fu
ZHAO Ming-qin
HAN Fu-gen
Lv Zhong-xian
Cite this article:

ZHANG Guang-fu,ZHAO Ming-qin,HAN Fu-gen,Lv Zhong-xian,LIU Le,YAN Yong-sheng. Relationship between net photosynthetic rate of flue-cured tobacco and its physio-ecological factors. Journal of Zhejiang University: Agric. & Life Sci., 2011, 37(2): 187-192.

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http://www.zjujournals.com/agr/10.3785/j.issn.1008-9209.2011.02.011     OR     http://www.zjujournals.com/agr/Y2011/V37/I2/187


烤烟净光合速率与生理生态因子的关系

以"吉烟九号"成熟期烟叶为试验材料 , 利用 LI-6400便携式光合测定仪测定烟叶叶片的净光合速率 (Pn) , 并通过主成分分析和通径分析探讨净光合速率与生理生态因子的关系 . 结果表明 : 烤烟净光合速率呈单峰曲线 , 在11:00达到峰值 , 为9.88μmol.m -2. s -2 , 无" 光合午休" 现象 ; 气孔导度 (Gs) 、蒸腾速率 (Tr) 、叶片温度 ( TL ) 和大气温度 ( Ta ) 均呈单峰曲线 , 均与净光合速率呈正相关 ; 在生理因子日变化中 , 叶片温度和蒸腾速率起主导作用 , 气孔导度和胞间 CO2 浓度 ( Ci) 处于次要地位 ; 在生态因子日变化中 , 温度和大气 CO2 浓度 ( Ca ) 起主导作用 , 光照和湿度处于次要地位 ; 各生理因子对净光合速率的直接作用大小顺序为 Gs ＞ TL ＞ Tr ＞ Ci , 各生态因子对净光合速率的直接作用大小顺序为 TL ＞ Ta ＞ 相对湿度 (RH) ＞ Ca ＞ 光合有效辐射(PAR) . 综上所述, 气孔导度、叶片温度和蒸腾速率是影响净光合速率的主要生理因子, 光照和温度是影响净光合速率的主要生态因子 .
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