收稿日期: 2010-01-13
录用日期: 2010-05-07
网络出版日期: 2010-12-28
Comparison of photosynthetic and fluorescence characteristics among taxa in Paeonia sect. Paeonia
Received date: 2010-01-13
Accepted date: 2010-05-07
Online published: 2010-12-28
为了比较分析芍药组不同类群光合生理差异以及它们对各自不同光照环境的适应性, 测定了芍药组(Paeonia sect. Paeonia) 4种2变种的光合日变化、光响应曲线、CO2响应曲线, 以及叶绿素荧光特性。结果显示, 芍药组中不同类群之间光合速率差异明显, 各个种类的“午休”程度不同, 芍药(Paeonia lactiflora )和毛果芍药(P. lactiflora var. trichocarpa)的强光抑制现象没有川赤芍(P. veitchii)、美丽芍药(P. mairei)和窄叶芍药(P. anomala)明显。叶绿素荧光特征能够反映芍药组不同类群光合生理的差异。芍药组内不同类群地理分布的差异能部分从光合生理特征的适应性方面得到解释。
简在友, 王文全, 孟丽, 许桂芳, 王秋玲, 李卫东, 俞敬波 . 芍药组内不同类群间光合特性及叶绿素荧光特性比较[J]. 植物生态学报, 2010 , 34(12) : 1463 -1471 . DOI: 10.3773/j.issn.1005-264x.2010.12.013
Aims Our aims are to compare the photosynthetic and fluorescence characteristics in different species in Paeonia sect. Paeonia and to determine how these species fit different circumstances in photosynthesis. This information will be important in protecting and using these wild resources.
Methods The LI-6400 Portable Photosynthesis System was used to determine diurnal photosynthetic changes, light-response curves and CO2-response curves of different species in sect. Paeonia under good growth conditions. The OS5-FL modulated chlorophyll fluorometer was used to determine their chlorophyll fluorescence characteristics. The light-response curves and CO2-response curves were simulated with modified rectangular and nonrectangular hyperbolic models.
Important findings We found an obvious difference between photosynthetic rates of species in sect. Paeonia. The simulated result with modified rectangular hyperbolic model is more consistent with the result determined than the other model. The index of light-response curves and CO2-response curves differ among species. Paeonia veitchii, P. anomala, P. mairei, P. anomala var. intermedia and P. lactiflora have the characteristic of “siesta”, but it is not obvious in P. lactiflora var. trichocarpa. The index of chlorophyll fluorescence characteristics reflects the photosynthetic characteristics. The photosynthetic characteristics of P. lactiflora and P. lactiflora var. trichocarpa embody their strong adaptability.
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