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

AN Yan-ru; HU Ben-xiang; PENG Liang; WANG Yuan-yuan; HUANG Tao; ZHAO Ting; LI Jie; LUO Lu; CAO Fu-lin

doi:10.13422/j.cnki.syfjx.20181109

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

更新时间：2024-01-04

- Photosynthetic Response Characteristics and Diurnal Variation of Photosynthetic Parameters in Leaves of
- Chinese Journal of Experimental Traditional Medical Formulae Vol. 24, Issue 19, Pages: 68-72(2018)
- 作者机构：
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- DOI：10.13422/j.cnki.syfjx.20181109
  CLC： S567.239
- Published：2018
- 稿件说明：
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AN Yan-ru, HU Ben-xiang, PENG Liang, et al. Photosynthetic Response Characteristics and Diurnal Variation of Photosynthetic Parameters in Leaves of [J]. Chinese journal of experimental traditional medical formulae, 2018, 24(19): 68-72.
DOI：

AN Yan-ru, HU Ben-xiang, PENG Liang, et al. Photosynthetic Response Characteristics and Diurnal Variation of Photosynthetic Parameters in Leaves of [J]. Chinese journal of experimental traditional medical formulae, 2018, 24(19): 68-72. DOI： 10.13422/j.cnki.syfjx.20181109.

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19.13，16.54 μmol·m-2·s-1，谷底出现在14：00左右，净光合速率值为15.04 μmol·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。

Abstract

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 of 15.04 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.

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