Supplementary calcium can help enhance photochemical activity in peanuts (Arachis hypogaea) leaves under low night temperature stress
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Abstract
Exogenous calcium is able to maintain photosynthesis level under low night temperature (LNT) stress. Nevertheless, the mechanism for supplementary calcium to mitigate photosynthesis barriers under LNT has not been as clear as expected so far. This study mainly covered the response rules to Ca2+ and Ca2+ inhibitors for Photosystem II (PSII) photoinhibition, photochemical activity and allocation of absorbed light in leaves of peanut seedlings under low night temperature stress and during their recovery process. As the results indicated, low night temperature stress boosted excitation energy at PSII reaction centers of peanut leaves, and inhibited electron transfer, leading to imbalanced excitation energy distribution with lower photochemical efficiency between these two photosystems. The ratio of antenna heat dissipation increased, while the ratio assigned to photochemical reaction reduced in the process of light absorption, so photosynthetic efficiency declined. Foliar spray of exogenous calcium ameliorates the imbalanced excitation energy between Photosystem II(PSII) and Photosystem I (PSI), increasing electron transfer rate (ETR) and efficiency of light energy conversion at PSII reaction centers (Fv/Fm). More light energy is used for photosynthesis, thus promoting the growth of peanut seedlings. Supplementary calcium available helped to adjust PSII activity via increasing electron transfer rate, more excitation energy was transported to PSI, and the damage of PSII reaction center caused by excess excitation energy reduced. The increase of active reaction centers has enhanced the utilization efficiency of light energy.
Cite this as
2018. Supplementary calcium can help enhance photochemical activity in peanuts (Arachis hypogaea) leaves under low night temperature stress. PeerJ Preprints 6:e26834v1 https://doi.org/10.7287/peerj.preprints.26834v1Author comment
This is a submission to PeerJ for review.
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The raw data for figure 2 to figure 6.
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Competing Interests
The authors declare that they have no competing interests.
Author Contributions
Qiaobo Song performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the paper, approved the final draft.
Qingwen Shi performed the experiments, analyzed the data, authored or reviewed drafts of the paper, approved the final draft.
Chunming Bai performed the experiments, analyzed the data, approved the final draft.
Huixin Wang performed the experiments, analyzed the data, approved the final draft.
Di Wu performed the experiments, approved the final draft.
Qiping Dong performed the experiments, approved the final draft.
Xin Cheng performed the experiments, approved the final draft.
Yifei Liu conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, prepared figures and/or tables, authored or reviewed drafts of the paper, approved the final draft.
Xiaori Han contributed reagents/materials/analysis tools, authored or reviewed drafts of the paper, approved the final draft.
Funding
This work was supported by the Natural Science Foundation of China (31772391, 31301842), the Sheng Jing Talents Project of Shenyang City (RC170338), China Scholarship Council Project (201708210143), Program of Liaoning Excellent Talents in Universities (LJQ2015100) and National Peanut Research System (CARS-14). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
