《Table 6 List of principle components, percentage of variance and cumulative percentage》

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《三种苹果砧木在水培条件下对缺铁胁迫的耐受性（英文）》

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PC1:the first principal component；PC2:the second principal component；the same as below.

In order to comprehensively evaluate the tolerance to iron deficiency of the 3 apple rootstocks，16 indexes under iron-deficiency stress conditions were analyzed by the principal component analysis.As seen from Table 6，two principal components with the eigenvalue>1 were extracted and the eigenvalues were 10.499 and 5.501，respectively.And the first and second principal component variance contribution rates reached 65.620%and 34.380%，respectively.Notably，the cumulative variance contribution rate of the second principal component was 100.000%（more than 85%）without missing variables.Therefore，the first two principal components could completely reflect the different information of the resistance to iron deficiency.Furthermore，Table 7 showed that the principal component scores which could directly evaluate the resistence of the 3 apple rootstocks under the irondeficiency stress condition.The final scores were derived from the two principal components together based on the formula:F=F1×65.620%+F2×34.380%.Accordingly，the scores from high to low were M.sieversii’s>M.baccata’s>M.prunifolia’s.