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- Title
The Effects of Different Nitrogen Forms on Chlorophyll Fluorescence and Photosystem II in Lonicera japonica.
- Authors
Cao, Yiwen; Pan, Yonghui; Wang, Min; Liu, Tianheng; Meng, Xusheng; Guo, Shiwei
- Abstract
Plant nitrogen (N) utilization determines the photosynthetic capacity and functionality. This study investigated the response of Lonicera japonica plant growth parameters, leaf gas exchanges, light response curve (PN/I), chlorophyll fluorescence, and chlorophyll a fluorescence transient (OJIP) to different N sources: ammonium (NH4+), nitrate, and mixed N sources through hydroponic experiment. Furthermore, the commonly used mathematical models and jip-test were adopted to analysis the PN/I and OJIP curves, respectively. Here, plant biomass and photosynthetic rate significantly reduced under NH4+ treatment. The photoinhibition was more pronounced under treatment NH4+ compared with the other treatments, evidenced by simultaneous decrease of light-saturated point, photochemical quenching, and photochemical efficiency. Together with the result from PN/I and OJIP curves, we found that: (1) a rapid decrease of photosystem II effective light absorption cross-section and pigments in the lowest excited state was observed in NH4+ supply with the increase of light intensity, and thereby the decreased light absorption resulted in downregulated electron transfer efficiency. (2) The photoinhibition appeared as damages to the function of oxygen-evolving complex and electron transfer beyond plastoquinone pools, resulting in the decreased photochemistry activity and upregulated heat dissipation efficiency. In conclusion, NH4+-N supply reduced photosynthetic performance and induced the photoinhibition of L. japonica, which can be partly interpreted by the decreased light absorption ability, the damage of oxygen-evolving complex, and the blocked electron transfer during the photosynthetic light reaction process.
- Subjects
CHLOROPHYLL spectra; JAPANESE honeysuckle; PHOTOSYSTEMS; LIGHT absorption; CHARGE exchange
- Publication
Journal of Plant Growth Regulation, 2023, Vol 42, Issue 7, p4106
- ISSN
0721-7595
- Publication type
Article
- DOI
10.1007/s00344-022-10873-1