Photosynthetica, 2016 (vol. 54), issue 3

Photosynthetica 2016, 54(3):351-358 | DOI: 10.1007/s11099-016-0195-9

Chlorophyll a fluorescence of typical desert plant Alhagi sparsifolia Shap. at two light levels

L. Li1,2, X. Y. Li1,2,*, F. J. Zeng1,2, L. S. Lin1,2
1 State Key Laboratory of Desert and Oasis Ecology, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China
2 Cele National Station of Observation and Research for Desert-Grassland Ecosystem in Xinjiang, Cele, Xinjiang, China

Alhagi sparsifolia Shap. is exposed to a high-irradiance environment as the main vegetation found in the forelands of the Taklamakan Desert. We investigated chlorophyll a fluorescence emission of A. sparsifolia seedlings grown under ambient (HL) and shade (LL) conditions. Our results indicated that the fluorescence intensity in the leaves was significantly higher for LL-grown plants than that under HL. High values of the maximum quantum yield of PSII for primary photochemistry (φPo) and the quantum yield that an electron moves further than QA - (φEo) in the plants under LL conditions suggested that the electron flow from QA - (primary quinone electron acceptors of PSII) to QB (secondary quinone acceptor of PSII) or QB - was enhanced at LL compared to natural HL conditions. The efficiency/probability with which an electron from the intersystem electron carriers was transferred to reduce end electron acceptors at the PSI acceptor side and the quantum yield for the reduction of end electron acceptors at the PSI acceptor side were opposite to φPo, and φEo. Thus, we concluded that the electron transport on the donor side of PSII was blocked under LL conditions, while acceptor side was inhibited at the HL conditions. The PSII activity of electron transport in the plants grown in shade was enhanced, while the energy transport from PSII to PSI was blocked compared to the plants grown at HL conditions. Furthermore, PSII activity under HL was seriously affected in midday, while the plants grown in shade enhanced their energy transport.

Keywords: diurnal changes; electron transport chain; photosystem II activity; quantum yield; shade

Received: June 3, 2015; Accepted: December 3, 2015; Published: September 1, 2016Show citation

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Li, L., Li, X.Y., Zeng, F.J., & Lin, L.S. (2016). Chlorophyll a fluorescence of typical desert plant Alhagi sparsifolia Shap. at two light levels. Photosynthetica, 54(3), 351-358. doi: 10.1007/s11099-016-0195-9.
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