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(A) Diameter, (B) density and (C) total lumen area of xylem vessels of taproot and basal stem in cross sections of Poncirus trifoliata (PT) and Cleopatra mandarin (CM) seedlings. Histological data correspond to the mean of six independent plants (n = 6) of each rootstock. The value for each plant is the mean of three visual fields of three sections from three samples per root and stem. Different letters indicate statistically significant differences (P <0.05) (LSD test).
