Lower Nitrogen Availability Enhances Resistance to Whiteflies in Tomato.

Using the mean values of resistance and compensatory ability for each variety, we found a highly significant negative correlation between resistance and compensatory ability (Pearson’s r = –0.9954, p = 0.0046, d.f. = 2; Figure 7 ).

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Our analysis for seed production (number of seeds per plant) showed a marginally significant effect of both variety and N, with non-significant interaction effects ( Table 1 ).

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