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Performance of reciprocally sown populations of Senecio vulgaris from ruderal and agricultural habitats.

Abstract：

:Senecio vulgaris from ruderal habitats may colonise crop fields and persist in the new environment. Persistence may occur through phenotypic plasticity or genetic differentiation. In the presence of genetic variation, differential responses of life history traits to selection may lead to local adaptation. A reciprocal seed transplant experiment was conducted to determine environmental and genetic variation of life history traits in S. vulgaris from ruderal and agricultural habitats, and whether infection by the rust Puccinia lagenophorae is a selection factor in S. vulgaris populations. Emergence, growth and fecundity showed environmental as well as genetic variation, as shown by a significant site and origin effect. However, there was no evidence of local adaptation, as indicated by the absence of significant origin by site interactions. Genetic variation in emerging seedling numbers seems to be important for S. vulgaris, an annual plant which has no means other than seed production for propagation. Seedling survival was solely under environmental control stressing the importance of stochastic events for plant mortality. Most S. vulgaris from ruderal sites showed reduced growth, but still reached reproduction, suggesting that S. vulgaris is following the plastic strategy of a stress tolerator to endure unfavourable environments. Plants at most agricultural sites behaved like r-strategists, exploiting a productive environment for rapid plant growth and maximising reproduction. Emergence, survival, growth and fecundity were higher at the agricultural sites. Infection by the rust occurred at all sites, with the highest incidence at the agricultural sites, and was solely determined by the environment. A higher incidence did not result in an increased disease impact on plant growth and reproduction nor did it affect survival of S. vulgaris. Although the majority of life-history traits studied showed phenotypic and genetic variation, which can both be subject to natural selection, no adaptation of S. vulgaris to its local environment was detected.

journal_name

Oecologia

journal_title

Oecologia

authors

Leiss KA,Müller-Schärer H

doi

10.1007/s004420100649

subject

Has Abstract

pub_date

2001-07-01 00:00:00

pages

210-216

issue

eissn

0029-8549

issn

1432-1939

pii

10.1007/s004420100649

journal_volume

128

pub_type

杂志文章

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Performance of reciprocally sown populations of Senecio vulgaris from ruderal and agricultural habitats.