Root parameters and main and interactive effects of zinc and <i>SaMR12</i> on root tips, root total length, and root surface area of <i>S. alfredii</i>.

Values represent the mean ± standard deviation of three replicates. *Significant at the P<0.05 level, **Significant at the P<0.01 level. The different letters following the values in the same column indicate significant differences between the treatments at P<0.05 (Duncan's test). Main and interactive effects of zinc and SaMR12 on the root tips, root total length and root surface area of S. alfredii were examined by two-way analysis of variance. Both SaMR12 and zinc treatment significantly affected root tips (F = 199.2, P<0.01), total length (F = 47.6, P<0.01), and total surface area (F = 140.3, P<0.01) of S. alfredii (P<0.01). The total surface area of the root was also significantly affected by the interactive effects of (S × Zn) at the P<0.05 level. The surface areas did not include root hairs which cannot be detected using the root automatic scan apparatus. Root parameters and main and interactive effects of zinc and SaMR12 on root tips, root total length, and root surface area of S. alfredii.