Abstract
Structural changes in root apices of Catasetum pileatum Reichb. f. cultured in vitro, result in the formation of protocorm-like bodies (PLBs). These PLBs, in turn, give rise to seedlings. After 30 d incubation, the positions occupied by xylem and phloem in the vascular tissue, in transverse sections of the upper portions of PLBs, were typical of stem tissue. The vasculature of the central part of the PLBs resembled the transition region between shoot and root of whole plants, while in the remaining part of the PLBs, the vascular arrangement was similar to that found in roots.
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