Effect of Different CO2 Concentrations on Photosynthetic Performance of Alfalfa During Branching Stage

doi:10.11733/j.issn.1007-0435.2016.05.009

Acta Agrestia Sinica ›› 2016, Vol. 24 ›› Issue (5): 988-994.DOI: 10.11733/j.issn.1007-0435.2016.05.009

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Effect of Different CO₂ Concentrations on Photosynthetic Performance of Alfalfa During Branching Stage

ZHAI Xiao-meng^1,2, ZHANG Xiao-bo¹, WANG Min², ZANG Chun-xin², GUAN Xiao²

1. College of Agriculture, Key Laboratory of Protection and Development Utilization of Tropical Crop Germplasm Resources, Hainan University, Haikou, Hainan Province 570228, China;
2. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China

Received:2015-06-01 Revised:2016-03-21 Online:2016-10-15 Published:2017-01-13

不同CO₂浓度对苜蓿分枝期光合性能的影响

翟晓朦^1,2, 张晓波¹, 王敏², 臧春鑫², 关潇²

1. 海南大学农学院热带作物种质资源保护与开发利用教育部重点实验室, 海南海口 570228;
2. 中国环境科学研究院环境基准与风险评估国家重点实验室, 北京 100012

通讯作者: 关潇
作者简介:翟晓朦(1990-),女,江苏泰州人,硕士,主要从事草地资源的研究与利用,E-mail:xiaomengzhai815@126.com
基金资助:
2012年环保公益项目“气候变化下保护优先区脆弱性评估与保护对策研究”（201209031）资助

Abstract

Abstract:

Under different CO₂ concentrations, this experiment studied the diurnal changes of photosynthetic rate and chlorophyll fluorescence parameters of Alfalfa ‘Maverick’ during the branching stage and explored the potential of alfalfa production. It will provide guidance for the forage industry in the process of increasing CO₂ concentration in the future. Compared with CK, when the CO₂ concentration in the open top chamber (OTC) increased to 550 μmol·mol^-1 and 700 μmol·mol^-1, the content of chlorophyll increased by 2.4%,3.6%, but the difference was not significant. Net photosynthesis rate (Pn) of alfalfa increased with the increasing CO₂ concentration. The daily average values of Pn increased by 114.69% and 116.54% when compared with CK. Furthermore, CO₂ enrichment increased the light energy transformation efficiency of PSⅡ (Fv/Fm),activity potential of PSⅡ (Fv/Fo) and actual photochemical efficiency of PSⅡ (Yield). Significantly increased photochemical quenching (qP) and reduced non photochemical quenching (NPQ) were observed as well(P<0.05). The experiment showed that ‘Maverick’ under high CO₂ concentration can capture more light energy, increase proportion of PSII reaction centers and have stronger photosynthesis.

Key words: Alfalfa, CO₂ concentration, Photosynthetic rate, Chlorophyll fluorescence

摘要：

以苜蓿（Medicago sativa）‘Maverick’为试验材料，研究不同CO₂浓度下苜蓿分枝期的光合能力日变化情况，探索未来大气CO₂浓度上升过程中苜蓿的生产潜力，为未来牧草种植产业提供指导。结果表明：当开顶式生长室中CO₂浓度为550和700 μmol·mol^-1时，‘Maverick’的叶绿素含量对比室外对照组分别提高了2.4%和3.6%，但差异不显著。净光合速率（Pn）日平均值分别提高了114.69%和116.54%。此外，CO₂浓度升高提高了苜蓿的光系统Ⅱ（PSII）的原初光能转换效率（Fv/Fm）、潜在活性（Fv/Fo）、实际光化学量子产量（Yield），并显著增加了光化学淬灭（qP），降低非光化学淬灭（NPQ）。研究结果表明在高CO₂浓度条件下更利于‘Maverick’叶绿素捕获光能，PSII反应中心比例大，光合作用增强。

关键词: 苜蓿, CO₂浓度, 光合速率, 叶绿素荧光

CLC Number:

S541.9

ZHAI Xiao-meng, ZHANG Xiao-bo, WANG Min, ZANG Chun-xin, GUAN Xiao. Effect of Different CO₂ Concentrations on Photosynthetic Performance of Alfalfa During Branching Stage[J]. Acta Agrestia Sinica, 2016, 24(5): 988-994.

翟晓朦, 张晓波, 王敏, 臧春鑫, 关潇. 不同CO₂浓度对苜蓿分枝期光合性能的影响[J]. 草地学报, 2016, 24(5): 988-994.

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Effect of Different CO₂ Concentrations on Photosynthetic Performance of Alfalfa During Branching Stage

不同CO₂浓度对苜蓿分枝期光合性能的影响

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