Effects of Sand Dust and Shading Combined Stress on Photosynthesis of Prunus domestica L. Leaves

doi:10.3969/j.issn.1000-6362.2019.03.004

Abstract

Abstract:

In order to investigate the change mechanism of photosynthetic characteristics of Prunus domestica L. under long-term dust and shading combined stress, the five-year-old Prunus domestica L. was used as research material to lightly dust and shade the leaves. Composite (1mg·cm-2 dust + white gauze 1 layer) and heavy dust and shading composite (5mg·cm-2 dust + white gauze 3 layers) were treated, and their photosynthesis, chlorophyll fluorescence, etc. were measured at 10, 20, 30 and 40 days of stress, respectively. The results showed that the contents of total chlorophyll(Chl), chlorophyll a(Chl-a) and chlorophyll b(Chl-b) decreased with the increase of stress time. Net photosynthetic rate(Pn), transpiration rate(Tr) and stomatal conductance(Gs), water use efficiency(WUE) decreased with the prolongation of treatment time, and intercellular CO2 concentration(Ci) showed a trend of decreasing first and then increasing. Fluorescence(Fm), PSII maximum photochemical efficiency(Fv/Fm), potential activity(Fv/F0), Photochemical quenching(qP) showed a downward trend, initial fluorescence(F0), Non-photochemical quenching(NPQ) increased trend. It is indicated that the stomatal factors in the early stage of sand and shading combined treatment are the main limiting factors for photosynthesis of prune. The latent treatment causes damage to photosynthetic apparatus, and non-stomatal factors become the main limiting factor. The compound stress affected the photosynthetic parameters of Prunus domestica L. leaves, but did not cause irreversible damage to the photoreaction system of Prunus domestica L. leaves.

Key words: Sand dust shading combined stress, Prunus domestica L, Chlorophyll content, Photosynthetic characteristics, Chlorophyll fluorescence parameters

XUE Ya-rong, Batur BAKE. Effects of Sand Dust and Shading Combined Stress on Photosynthesis of Prunus domestica L. Leaves[J]. Chinese Journal of Agrometeorology, 2019, 40(03): 170-179.

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