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Developmental Anatomy and Histochemistry of Light-Induced Callus Formation by Diöon edule (Zamiaceae) Seedling Roots in Vitro
David T. Webb
American Journal of Botany
Vol. 71, No. 1 (Jan., 1984), pp. 65-68
Published by: Botanical Society of America, Inc.
Stable URL: http://www.jstor.org/stable/2443624
Page Count: 4
You can always find the topics here!Topics: Callus, Plant cells, Callus formation, Periderm, Cell walls, Toluidines, Plant tissues, Seedlings, Starches, Cell growth
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Light exposure caused massive areas of callus to develop from primary roots of aseptically cultured Diöon edule seedlings. Callus initiation and continued growth was due to cortical cell hypertrophy and subsequent periclinal cell division. Callus initiation occurred in the subdermal cortex and developed radially and centripetally from the locus of initiation. Callus formation encompassed virtually all of the cortex, but did not incorporate any of the vascular tissues. With very large calluses, sectors of internal periderm arose between the developing callus and the remaining quiescent cells of the inner cortex. Most of the callus cells were typical, vacuolate parenchyma with cellulose walls, and large, multilobed amyloplasts. Callus also contained idioblasts with globular deposits of polyphenols. Adjacent cortical cells were typical parenchyma with peripheral cytoplasm, but contained small plastids with little starch accumulation.
American Journal of Botany © 1984 Botanical Society of America, Inc.