Phenotype correlation analysis and excellent germplasm screening of herb Bletilla Rchb. f. based on comprehensive evaluation from thirty-three geographic populations.

In general, except in GXHZ, HNCL and SCWY, the weight of the pseudobulbs increased with the growing period, while the average annual growth rates of the pseudobulb were 2.42, 1.69 and 1.31, respectively, showing a decreasing trend.

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The militarine content in pseudobulbs shows an increasing trend year by year, implying that sufficient growth years are required to accumulate more militarine content, and further research is needed to reveal the synthesis and metabolic mechanisms of militarine in Bletilla plants (unpublished).

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There were 4 other correlation coefficients greater than 0.7, 3 correlation coefficients greater than 0.6, 5 correlation coefficients greater than 0.5, and 7 correlation coefficients greater than 0.4, and all of them showed extremely significant differences with P values of less than 0.01.

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