Elevational trends in defense chemistry, vegetation, and reproduction in Sanguinaria canadensis

Citation
Ak. Salmore et Md. Hunter, Elevational trends in defense chemistry, vegetation, and reproduction in Sanguinaria canadensis, J CHEM ECOL, 27(9), 2001, pp. 1713-1727
Citations number
44
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
JOURNAL OF CHEMICAL ECOLOGY
ISSN journal
0098-0331 → ACNP
Volume
27
Issue
9
Year of publication
2001
Pages
1713 - 1727
Database
ISI
SICI code
0098-0331(200109)27:9<1713:ETIDCV>2.0.ZU;2-1
Abstract
Evaluation of biotic interactions along geographic gradients reveals that p ressure on plant populations by herbivores and pathogens increases as latit ude decreases. and is accompanied by a parallel increase in the number and toxicity of alkaloid-bearing plants. We compared rhizome alkaloid content w ith plant reproductive and vegetative characters in Sanguinaria canadensis (Papaveraceae) along an elevational gradient over two growing seasons to as certain 1) if alkaloid production in bloodroot varies among populations and systematically with elevation, and 2) if there exists a correlation betwee n isoquinoline alkaloid, vegetative and reproductive production. In general , alkaloid content in bloodroot rhizomes declines with elevation, increases with rhizome water content, varies by site, and fluctuates seasonally with plant growth and reproduction. Alkaloid content was positively correlated with vegetative and reproductive effort with few exceptions. Analysis of to tal protopine and benzophenanthridine alkaloid concentrations revealed gene rally similar patterns as those of individual alkaloid concentrations, alth ough significant differences did appear between individual alkaloid concent rations.