Translocation in Polytrichum commune (Bryophyta). II. Clonal integration
- Bates College, Lewiston, ME (USA)
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-{sup 14}CO{sub 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.
- OSTI ID:
- 5760485
- Journal Information:
- American Journal of Botany; (USA), Vol. 77:12; ISSN 0002-9122
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
PLANT GROWTH
PHYSIOLOGY
ACETIC ACID
CARBON 14 COMPOUNDS
HORMONES
MOSSES
TRACER TECHNIQUES
BRYOPHYTA
CARBOXYLIC ACIDS
GROWTH
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PLANTS
551001* - Physiological Systems- Tracer Techniques