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ANATOMY OF REGENERATING ROOT SEGMENTS OF
TARAXACUM OFFICINALE
WEB.
Mohammad
Ishaque Khan
Abstract: A detailed study of the anatomy of proximal and distal ends
of regenerating
Taraxacum officinale
root cutting was undertaken. It was found that cell division began just
below the cut ends of the root segments after 24 hr. of regeneration. At
the proximal end, shoot meristems were distinguished at 48 hr. in a
narrow zone around the xylem core. Later on callus growth followed,
carrying the new shoots upwards. Xyle n. strands differentiated
basipetally through the secondary phloem at seventh day. At the distal
end, xylem nodule appeared at the fourth day of regeneration in a wide
zone across the secondary phloem. Callus growth followed
later and meiistem appeared in the callus, distal to the xylem nodule,
after two weeks. The young shoot and root meristem had identjcal
appearance.
Department of Botany, The
University of Sheffield, Sheffield, U.K.
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