Effects of Different Light Radiation Intensities on Photosynthesis of Three Vine Plants

doi:10.11924/j.issn.1000-6850.casb2021-0742

Abstract

Abstract:

It is of great significance to study the responses of photosynthesis, stomatal conductance and transpiration of plants to photosynthetic active radiation, to evaluate the utilization efficiency of light energy and water and the plant growth under different light conditions. In the present study, three vine plants (Vinca major, Passiflora caerulea and Campsis grandiflora) were used to measure their gas exchange and chlorophyll content under different light levels. The photosynthetic parameters were estimated according to non-rectangular hyperbola model. The results showed that: the light saturated point and the maximum net photosynthetic rate of P. caerulea were 1850 μmol CO₂/( m²·s) and 10.9 μmol CO₂/(m²·s), respectively, significantly higher than those of V. major and C. grandiflora. V. major was strongly resistant to weak light with a lower light saturation point of 580 μmol CO₂/( m²·s), significantly lower than that of the other two plants. There was no significant difference in apparent quantum yield among the three plants, indicating they had similar ability to use weak light. The chlorophyll content of V. major was significantly higher than that of P. caerulea, but P. caerulea had a higher ratio of chlorophyll a/b than V. major. P. caerulea had a wide range of light adaptation and stronger utilization of low and high light. Therefore, the photosynthetic capacity of P. caerulea is higher than that of V. major and C. grandiflora.

Key words: maximum light net photosynthetic rate, light compensation point, light saturated point, apparent quantum yield, water use efficiency

CLC Number:

685.99

ZHU Wenjie, ZHENG Mingjie, KANG Yuguo. Effects of Different Light Radiation Intensities on Photosynthesis of Three Vine Plants[J]. Chinese Agricultural Science Bulletin, 2022, 38(26): 27-31.

Figures/Tables 3

References 27

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光合参数	蔓长春花	西番莲	凌霄
表观量子效率	0.048±0.008a	0.040±0.006a	0.047±0.0033a
最大净光合速率/[μmolCO₂/(m²·s)]	4.8±0.3c	10.9±0.9a	8.9±0.7b
光补偿点/[μmol/(m²·s)]	33.8±1.2a	28.5±0.9b	16.0±1.1c
光饱和点/[μmol/(m²·s)]	580±23c	1850±31a	1450±20b
暗呼吸速率/[μmolCO₂/(m²·s)]	-1.8±0.4a	-1.5±0.6a	-1.7±0.3a

光合参数	蔓长春花	西番莲	凌霄
表观量子效率	0.048±0.008a	0.040±0.006a	0.047±0.0033a
最大净光合速率/[μmolCO₂/(m²·s)]	4.8±0.3c	10.9±0.9a	8.9±0.7b
光补偿点/[μmol/(m²·s)]	33.8±1.2a	28.5±0.9b	16.0±1.1c
光饱和点/[μmol/(m²·s)]	580±23c	1850±31a	1450±20b
暗呼吸速率/[μmolCO₂/(m²·s)]	-1.8±0.4a	-1.5±0.6a	-1.7±0.3a