NDLI: Morphological, phytochemical and genetic variation in mixed stands and a hybrid swarm of Senecio germanicus and S. ovatus (Compositae, Senecioneae)

Content Provider	Springer Nature Link
Author	Oberprieler, Christoph Hartl, Sabine Schauer, Kerstin Meister, Jörg Heilmann, Jörg
Copyright Year	2011
Abstract	Mixed stands of Senecio ovatus subsp. ovatus and S. germanicus subsp. germanicus occur in the colline belt of central and eastern Europe. The latter species is adapted to more continental climate conditions and shows a later flowering time (August–September) than the widespread S. ovatus (July–August) that grows in more oceanic climates. We have surveyed 253 plants from 15 populations north of Regensburg (south-eastern Germany) using 16 qualitative and quantitative morphological characters and molecular markers [amplified fragment length polymorphisms (AFLP)] to detect introgressive hybridisation between these two species. Both multivariate statistical analyses based on morphological characters and the Bayesian clustering based on AFLP fingerprint data show that in most populations under study the two species form distinct entities and do not hybridise with each other. However, in one population from the Upper Palatine Forest a high number of intermediate individuals were found. A more detailed genetic (AFLP) and phytochemical (pyrrolizidine alkaloid, PA) analysis based on 125 individuals from this hybrid swarm indicated that these intermediate individuals are backcrosses towards S. germanicus. It is shown that the two species differ considerably concerning the qualitative and quantitative PA patterns and that backcrossed individuals either show an additive PA pattern or a PA pattern similar to S. germanicus, while in quantitative respects all of these individuals are approaching S. germanicus. These findings are discussed in terms of differential selection regimes influencing the fitness of pure and hybrid plants in an area which is an eco-climatological optimum for the more oceanic S. ovatus but which forms a distributional edge for the more continental S. germanicus.
Starting Page	177
Ending Page	191
Page Count	15
File Format	PDF
ISSN	03782697
Journal	Plant Systematics and Evolution
Volume Number	293
Issue Number	1-4
e-ISSN	16156110
Language	English
Publisher	Springer Vienna
Publisher Date	2011-03-22
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	AFLP fingerprinting Asteraceae Chemical defence Herbivory Hybridisation Introgression Pyrrolizidine alkaloids Senecio Plant Ecology Plant Sciences Plant Systematics/Taxonomy/Biogeography Plant Anatomy/Development
Content Type	Text
Resource Type	Article
Subject	Plant Science Ecology, Evolution, Behavior and Systematics

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