烤烟净光合速率与生理生态因子的关系  

Relationship between net photosynthetic rate of flue-cured tobacco and its physio-ecological factors

作　　者：张广富[1] 赵铭钦[1] 韩富根[1] 吕中显[1] 刘乐[1] 闫永胜[1] 

机构地区：[1]河南农业大学烟草学院,河南郑州450002

出　　处：《浙江大学学报（农业与生命科学版）》2011年第2期187-192,共6页Journal of Zhejiang University:Agriculture and Life Sciences

基　　金：吉林烟草工业有限责任公司重大科技攻关资助项目(JY2006012)

摘　　要：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-1,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.The diurnal changes of net photosynthetic rate （Pn） in leaves of tobacco cultivar ＂Jiyan NO. 9＂ were studied by LI-6400 portable photosynthesis system, and the relationship between the Pn and its 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 9.88μmol.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 and Pn; 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 roles in the changes of Pn among the physiological factors, and light and temperature affected the changes of Pn among the ecological factors.

关 键 词：吉烟九号 净光合速率 生理因子 生态因子 

分 类 号：S572[农业科学—烟草工业]