PJB-2018-973
Genotypic variation in photosynthetic carbon assimilation of wheat under nano-ZnO stress
Zhongwei Sun
Abstract
It has been shown that increased concentration of zinc oxide nanoparticles in soil are harmful to plant growth. However, the sensitivity of different wheat cultivars to nano-ZnO stress is unclear. Four wheat cultivars with different responses to nano-ZnO stress were selected, depending on the previous nano-ZnO stress trials with 120 wheat cultivars in China. It was found that nano-ZnO stress significantly decreased the photosynthetic carbon assimilation in all cultivars, due to the reduced chlorophyll concentration and photosynthetic electron transport efficiency. However, genotypic variation in photosynthetic carbon assimilation under nano-ZnO stress was found in wheat. The wheat cv. JM22 and LM6 possessed relatively lower Zn concentration and higher leaf N, less reduction in photosynthetic rate and soluble sugar concentrations under nano-ZnO stress, showing a better tolerance to nano-ZnO stress, compared with cv. TS1 and ZM18. In addition, the chlorophyll a fluorescence parameters Fv/Fm (maximum quantum yield of the PS II), TR/CSm (trapped energy flux per cross-section) and ET/CSm (electron transport flux per CS) could be useful for rapid screening wheat cultivars tolerant to nano-ZnO stress.
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