摘要
目的研究桔梗光合生理特性,为桔梗栽培管理提供参考。方法利用Li-6400便携式光合作用系统测定桔梗光合作用光响应曲线(Pn-PAR)以及净光合速率日变化规律。结果桔梗饱和光强(SL)为1 493.25μmol.m-2.s-1,光补偿点(LCP)为44.91μmol.m-2.s-1;桔梗净光合速率(Pn)日变化呈双峰曲线,上下午各有一个高峰,午后有典型的"午休"现象。第1峰出现在上午11:00,净光合速率(Pn)为16.66μmol.m-2.s-1,第2峰出现在15:00,净光合速率(Pn)为10.63μmol.m-2.s-1。14:00时,净光合速率(Pn)为8.49μmol.m-2.s-1,是一天中的最低值;桔梗净光合速率(Pn)午后降低出现光合"午休"是由气孔限制因素和非气孔限制因素共同作用引起,而气孔非限制因素起主要作用。结论桔梗的光合特性表明为典型的阳生植物,对光照的适应性较强,在生产上宜选择光照条件好的地块,并加大种植密度,以提高桔梗的产量。
Objective To provide references of cultivation management, the photosynthetic physiological characteristics of Platycodon grandiflorum were studied. Methods Photosynthesis light response curve （ Pn - PaR） and the diurnal change law of net photosynthetic rate were determined by Li- 6400 portable photosynthesis system. Results The Saturation light intensity （SL） of P. grandiflorum was 1493.25 μmol·m^-2·s^ -1 and its light compensation point （LCP） was 44.91 pLmol · m ^-2· s ^-1. The diurnal changes of net photosynthetic rate （Pn） presented a double -apex curve. The first peak appeared at 11：00 am when its Pn was 16.66 μmol · m^-2· s^-1. The second one occurred at 15：00 pm when its Pn was 10.63 μmol·m^-2·s^ -1. The lowest Pn was 8.49 μmol· m^-2· s^-1 at 14：00 pm during one whole day. The phenomenon of ＂noon break＂ caused by stomatal limitation and non - stomatal limitation played a major role. Conclusion Photosynthetic Characteristics of P. grandiflorum indicates that it is a typical sun plant and has strong adaptability to high light. To increase yield, it is necessary to select a place in good light condition for them and to add plant density.
出处
《时珍国医国药》
CAS
CSCD
北大核心
2009年第8期2022-2023,共2页
Lishizhen Medicine and Materia Medica Research
基金
国家发改委中药材生产扶持项目(No.2005-⑧)
关键词
桔梗
饱和光强
光补偿点
光合速率日变化
Platycodon grandiflorum
Satuation light intensity
Light compensation point
The diurnal change of photosynthetic rate
