Somatic Reduction in Cycads

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Science  09 Feb 1968:
Vol. 159, Issue 3815, pp. 648-650
DOI: 10.1126/science.159.3815.648


Recurrent somatic reduction is a normal ontogenetic process in apogeotropic roots of cycads, which develop into dichotomously branching coralloid masses. The reduced cells make up part of a ring of differentiated cortical tissue lying midway between the pericycle and the epidermis; they serve as fillers among the large cells and become charged with slime. The differentiated tissue is colonized by a species of blue-green algae.