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Fig. 11 | BMC Plant Biology

Fig. 11

From: Exogenous melatonin improves the salt tolerance of cotton by removing active oxygen and protecting photosynthetic organs

Fig. 11

Principal component analysis (PCA) of 18 aboveground traits. Clockwise, the abbreviations stand for: LAX leaf area of xylem, LAP leaf area of phloem, Pro proline, SN stomatal number, PT palisade tissue thickness, Na+ sodium ion, NPQ non-photochemical quenching, H2O2 hydrogen peroxide, \( {O}_2^{\cdotp -} \) superoxide anion, ST spongy tissue thickness, K+ potassium ion, SPT stem phloem thickness, TDW total dry weight, Pn the net photosynthetic rate, SPAD SPAD value, SXT stem xylem thickness, Fv/Fm the maximum photochemical efficiency of PSII, SA stomatal aperture

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