Linked Life Data

19402881

Source:http://linkedlifedata.com/resource/pubmed/id/19402881

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2009-8-7
pubmed:abstractText
Physiological changes with ontogeny are common in plants. Although ontogenetic changes are hypothesized to improve plant function, their adaptive significance has rarely been tested. Here, we estimated phenotypic selection on ontogenetic change in photosynthesis (A) and stomatal conductance (g(s)) of Avena barbata. We tested whether ontogenetic changes in A and g(s) increased fitness in wet and dry soil environments. To determine whether evolution in response to this selection would be constrained, we estimated the heritability of ontogenetic change in physiology, as well as cross-environment genetic correlations. Ontogenetic change in A, but not g(s), was adaptive in the wet soil environment; plants that maintained or increased A from the prereproductive to the reproductive phase had higher fitness. In the dry soil environment, ontogenetic change in A and g(s) was adaptively neutral. We detected significant genetic variation for ontogenetic change in A and g(s), but no cross-environment genetic correlations, suggesting that the evolution of these traits would not be genetically constrained. We demonstrate that ontogenetic changes in physiological traits can increase fitness but the adaptive value of these changes varies among traits and environments.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
1469-8137
pubmed:author
pubmed:issnType
Electronic
pubmed:volume
183
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
908-18
pubmed:meshHeading
pubmed:year
2009
pubmed:articleTitle
The adaptive significance of ontogenetic changes in physiology: a test in Avena barbata.
pubmed:affiliation
Department of Integrative Biology, University of Guelph, Guelph, Ontario, Canada.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't