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摘要: 以3种金鸡菊属Coreopsis 植物1年生扦插苗为研究对象,在室外自然条件下,运用美国产的Li-6400光合系统测定仪对其光合作用日变化和光响应进行了测定。结果表明:3种金鸡菊的光补偿点和光饱和点各不相同。对光的适应范围大小为重瓣金鸡菊Coreopsis lanceolata>大花金鸡菊Coreopsis grandiflora>天堂之门金鸡菊Coreopsis rosea;对强光的利用能力大小为重瓣金鸡菊>天堂之门金鸡菊>大花金鸡菊。3种金鸡菊属植物的净光合速率(Pn)日变化都呈双峰型曲线,第1峰值均大于第2峰值,有明显的光合午休现象,蒸腾速率(Tr)和气孔导度(Cond)变化趋势与净光合速率相似,胞间二氧化碳摩尔分数(Ci)变化趋势则与其相反。3种金鸡菊属植物的水分利用效率(EWUE)差异显著,大小依次为大花金鸡菊>重瓣金鸡菊>天堂之门金鸡菊。图4表1参24Abstract: To determine diurnal variation of photosynthetic characteristics and light intensity responses for Coreopsis grandiflora,Coreopsis lanceolata,and Coreopsis rosea an Li-6400 photosynthetic system analyzer was used under natural light conditions. Results indicated different light compensation and light saturation points. The light adaptive range sequence was C. lanceolata > C. grandiflora > C. rosea,and the ability to use relatively strong light was C. lanceolata > C. rosea > C. grandiflora. In addition,diurnal variation in the net photosynthetic rate (Pn) for all three species displayed double-peaked curves with a greater initial peak and a clear photosynthetic noon break. Compared to Pn,the transpiration rate (Tr) and stomatal conductance (Cond) showed similar changes;however,changes in intercellular carbon dioxide concentration (Ci) were reversed. Also,water use efficiency (EWUE) for the three Coreopsis species differed with C. grandiflora > C. lanceolata > C. rosea,which provide the basis for water management of Coreopsis species.[Ch,4 fig. 1 tab. 24 ref.]
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链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2012.05.019

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