Correlation analysis revealed that anthocyanin had a highly significant negative correlation with chlorophyll content, and that chlorophyll a and b content had a significant negative correlation with a* , while anthocyanin content had a highly significant positive correlation with a* , C* and color light value, indicating that over time, anthocyanin content decreased, while chlorophyll content gradually increased, and that the two changes were in opposite directions.
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Metabolome analysis reveals flavonoid changes during the leaf color transition in <i>Populus × euramericana</i> 'Zhonghuahongye'.
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Most of the differentially expressed metabolites showed a downregulation trend in the second period and an upregulation trend in the third period, i.e., the differential metabolite content showed a trend of first decreasing and then increasing ( Table S2 ).