金荞麦叶片光合响应特征及光合参数日变化  

Photosynthetic Response Characteristics and Diurnal Variation of Photosynthetic Parameters in Leaves of Fagopyrum dibotrys

作　　者：安衍茹 胡本祥[1] 彭亮[1] 王媛媛 黄涛 赵停 李洁[1] 罗露 曹福麟 AN Yan-ru;HU Ben-xiang;PENG Liang;WANG Yuan-yuan;HUANG Tao;ZHAO Ting;LI Jie;LUO Lu;CAO Fu-lin(Shaanxi University of Chinese Medicine,Xianyang 712046,China)

机构地区：[1]陕西中医药大学

出　　处：《中国实验方剂学杂志》2018年第19期68-72,共5页Chinese Journal of Experimental Traditional Medical Formulae

基　　金：国家中医药行业科研专项(201507002-1-08);国家中药标准化项目(ZYBZH-Y-QIN-36:202410001)

摘　　要：目的：研究金荞麦叶片光合响应特征及光合参数日变化与环境因子之间的相互关系。方法：利用便携式光合测定仪测定金荞麦叶片光合参数日变化和光响应曲线。结果：金荞麦叶片净光合速率日变化、气孔导度日变化均呈双峰曲线,有明显的光合午休现象;净光合速率数值分别为19.13,16.54μmol·m-2·s-1,谷底出现在14：00左右,净光合速率值为15.04μmol·m-2·s-1,约为最大峰值的78.62%,此时出现了较为明显的光合午休现象。净光合速率（Pn）与主要影响因子光合有效辐射（PAR）,蒸腾速率（Tr）,气孔导度（Gs）呈正相关,与大气CO2浓度（Ca）,胞间CO2浓度（Ci）呈负相关。结论：金荞麦为气孔限制型植物,Pn存在明显的光合午休现象,光合有效辐射、蒸腾速率、气孔导度、大气温度是影响金荞麦叶片Pn的主要影响因子。Objective： To investigate the relationship between the photosynthetic response characteristics,daily variation of photosynthetic parameters and environmental factors in leaves of Fagopyrum dibotrys. Method： The daily variation of photosynthetic parameters and light response curves of leaves of F. dibotrys were measured by portable photosynthesis apparatus. Result： Both diurnal variation of net photosynthetic rate（ Pn） and the diurnal variation of stomatal conductance（ Gs） in leaves of F. dibotrys showed a double peak curve,with an obvious midday depression phenomenon. Their net photosynthetic rate was 19. 13 and 16. 54 μmol·m-2·s-1 respectively, and bottom was at 14： 00 with a net photosynthetic rate of15. 04 μmol·m-2·s-1,about 78. 62% of the maximum peak value,showing a phenomenon of midday depression of photosynthesis. The net photosynthetic rate was positively correlated with the main influencing factors including photosynthetically active radiation（ PAR）, transpiration rate（ Tr）, stomatal conductance, and negatively correlated with atmospheric CO2 concentration（ Ca） and intercellular CO2 concentration（ Ci）. Conclusion：F. dibotrys is a stomatal limiting plant,and Pn has obvious midday depression of photosynthesis phenomenon.Photosynthetic active radiation,transpiration rate,stomatal conductance and atmospheric temperature are the main influencing factors for Pn in leaves of F. dibotrys.

关 键 词：金荞麦 净光合速率 日变化 环境因子 清热解毒 

分 类 号：R282.2[医药卫生—中药学] R282.5[医药卫生—中医学]