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RELATION OF PLASTOCHRON TO ANATOMY AND GROWTH IN THE SHOOT APEX OF CHRYSANTHEMUM
Author(s) -
Berg Arthur R.
Publication year - 1970
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1970.tb09788.x
Subject(s) - biology , apex (geometry) , tunica , anatomy , cambium , botany , xylem
The relation between plastochron stage, apical anatomy, and thymidine‐C 14 incorporation was studied in the shoot apex of Chrysanthemum morifolium ‘Albatross.’ Apices were sorted into early, middle, and late plastochron stage under a dissecting microscope, fixed, and sectioned longitudinally so that median sections included known sectors of the apical flank. Study of these sections revealed no discernible difference between apices in early, middle, or late plastochron with respect to regularity of cell pattern, presence of a cambium‐like zone, appearance of the second tunica layer or staining pattern with pyronin or with toluidine blue. Likewise, apices that had been treated with thymidine‐C 14 for 2‐4 hr showed no differences between the three stages in number or distribution of labeled cells.