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TRANSLOCATION IN POLYTRICHUM COMMUNE (BRYOPHYTA). II. CLONAL INTEGRATION
Author(s) -
Thomas Robert J.,
Schiele Edwin M.,
Damberg Douglas T.
Publication year - 1990
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.1537-2197.1990.tb11397.x
Subject(s) - biology , shoot , rhizome , perennial plant , botany , moss , shading , growing season , horticulture , art , visual arts
Polytrichum commune is a perennial moss that grows by rhizomatous production of interconnected shoots. It possesses a well‐developed internal system of food‐conducting tissue. Liquid scintillation determinations following pulse‐ 14 CO 2 treatment of a single shoot in rhizomatously connected groups indicate that tagged photoassimilates are transported into:1) newly developing stems during the early growing season; 2) shared rhizomes (with an increase observed in rhizome allocation toward the end of the year, as well as a year‐end percentage increase in starch reserves); and 3) mature neighboring shoots. Over the course of the growing season, photoassimilate export from pulse‐labeled shoots ranges between 12.9% and 21.4% of total tagged. The amount of export is significantly influenced by defoliation, shading, stem tip removal, and 50 ppm indole‐3‐acetic acid treatments performed on rhizomatously connected neighbor shoots. Physiological integration within P. commune can be inferred from these results. Control is exerted by endogenous hormones or by changes in the activity of sources and sinks.