Photosynthetica 2018, 56(3):976-980 | DOI: 10.1007/s11099-017-0744-x

Short-term effects of surface dust: alleviating photoinhibition of cotton under high irradiance in the Tarim Basin

L. Li1,2,3,*, G. Mu2
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 Ecosystems, Cele, China
3 Key Laboratory of Biogeography and Bioresources in Arid Zone, Chinese Academy of Sciences, Urumqi, China

Dust deposition on leaf surfaces can impact the growth and physiological traits of plants. We carried out a field experiment to investigate short-term effects of light surface dust on photosynthesis of cotton in the Tarim Basin using chlorophyll fluorescence and gas-exchange techniques. JIP-test analysis of OJIP curves showed that the total performance index for leaves without dust decreased by 32% at noon compared to the morning value. High irradiance at noon reduced actual quantum yield of PSII and increased nonphotochemical quenching for leaves without dust, showing photoinhibition. It suggested that light surface dust alleviated photoinhibition of cotton to high irradiance on a short-term basis. For the leaves without dust, high irradiance induced photoinhibition not only with respect to the photochemistry reactions but the biochemical pathways of CO2 fixation. Mechanisms such as thermal dissipation and enhanced electron flux to PSI protected the photosynthetic apparatus under high irradiance.

Additional key words: chlorophyll a fluorescence; dust retention; electron transport; photosynthetic rate

Received: August 27, 2016; Accepted: May 17, 2017; Prepublished online: September 1, 2018; Published: August 1, 2018  Show citation

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Li, L., & Mu, G. (2018). Short-term effects of surface dust: alleviating photoinhibition of cotton under high irradiance in the Tarim Basin. Photosynthetica56(3), 976-980. doi: 10.1007/s11099-017-0744-x
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