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In order to evaluate the freeze stress of the winter wheat, field and pot experiments were conducted. The crop variables including plant height, above ground dry biomass (AGDB), chlorophyll content (CHLC), peroxidase (POD), superoxide dismutase (SOD), malondialdehyde (MDA), photosynthetic indexes, and canopy spectra were selected and assessed. Statistical methods of correlation analysis, principal...
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