油莎豆不同生育时期叶片光合特性变化规律分析

doi:10.12190/j.issn.2096-1197.2021.06.06

Abstract

Abstract: 【Objective】To investigate the photosynthetic characteristics changes in leaves at different growth stages of Cyperus esculentus and to elucidate the photosynthetic physiological mechanisms as well.【Methods】At the five leaf stage（L₅）,ten leaf stage（L₁₀）,and fifteen leaf stage（L₁₅） of Cyperus esculentus,the diurnal changes in net photosynthetic rate（Pn）,intercellular CO₂ concentration（Ci）,stomatal conductance（Gs）,transpiration rate（Tr）,and light response curves of leaves were measured. A non-rectangular hyperbolic model was used to mimic the measured light response curves.【Results】The net photosynthetic rate of L₅ and L₁₀ leaves had a double peak trend,while L₁₅ leaves had a single peak. The daily mean of net photosynthetic rate comparison in the three growth stages was L₁₀>L₁₅>L₅,with values of 11.858,10.750,and 8.654 μmol/（m²·s）respectively. L₅,L₁₀,and L₁₅ had almost identical variation trends in intercellular CO₂ concentrations,with a “V” trend of decreasing first and then increasing. The minimum value appeared between 11：00 and 13：00. The stomatal conductance of L₅ showed a single peak trend with peak at 11：00 and a value of 0.478 mol/（m²·s）. L₁₀ and L₁₅ showed a double peak trend. The diurnal change of L₅,L₁₀,and L₁₅ transpiration rates had a single peak trend. The highest daily average value was L₁₀,and the minimum was L₅,with values of 3.218 and 2.048 mmol/（m²·s）,respectively. In terms of simulation parameters,the maximum net photosynthetic rate of L₁₀ was the highest[21.616 μmol/（m²·s）],which was 5.03% and 6.96% higher than that of L₅ and L₁₅ respectively. The maximum light saturation point of L₁₀ was 534.121 μmol/（m²·s）,and the maximum light compensation point of L₅ was 60.359 μmol /（m²·s）.【Conclusion】The overall photosynthetic performance of L₁₀ was stronger than that of L₅ and L₁₅,and L₁₀ had the highest utilization efficiency of strong light,while L₅ had better utilization efficiency of light energy than L₁₀ and L₁₅ under low light conditions.

Key words: Cyperus esculentus, Growth stage, Photosynthetic characteristics, Light response curve

CLC Number:

S565

XIE Rui, DONG Qi, REN Yongfeng, HOU Zhihui, MU Zongjie, ZHANG Xiangqian, LU Zhanyuan, ZHAO Xiaoqing. Analysis on changes in photosynthetic characteristics in leaves of Cyperus esculentus at different growth stages[J].Journal of Northern Agriculture, 2021, 49(6): 51-57.

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URL: https://journal30.magtechjournal.com/bfnyxb/EN/10.12190/j.issn.2096-1197.2021.06.06

https://journal30.magtechjournal.com/bfnyxb/EN/Y2021/V49/I6/51

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Analysis on changes in photosynthetic characteristics in leaves of Cyperus esculentus at different growth stages

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