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Histological cross-sections of normal, non-transformed roots and A. rhizogenes-transformed roots. (A) Normal root; (B) transformed root showing a non-altered phenotype (clone X13); (C) transformed root exhibiting the altered ‘fast growing’ phenotype (clone X19); and (D) transformed root with the altered phenotype characterized by slow growth and low percentage of fine roots (diameter <0·5 mm; clone X39). cc, central cylinder; rh, rhizoderm; pc, cortical parenchyma. Scale bar = 100 µm.
