Document Detail

Plant chemical defence allocation constrains evolution of local range.
MedLine Citation:
PMID:  19863716     Owner:  NLM     Status:  MEDLINE    
Many species of plants in the wild are distributed spatially in patches, the boundaries of which may occur and change because of a complicated interplay between myriad environmental stressors and limitations of, or constraints on, plant coping mechanisms. By examining genetic variation and co-variation among marker-inferred inbred lines and sib-families of an upland wild mustard species within and just a few meters across a natural patch boundary, we show that the evolution of tolerance to the stressful environment outside the patch may be constrained by allocation to glucosinolate compounds (GS) that are defensive against generalist insect herbivores. Several potential stressors were associated with the patch boundary, but carbon isotope ratios indicated that sib-families with smaller stomatal apertures maintained performance better in response to late season dry conditions, suggesting that drought was an important stressor. The presence of GS may help explain the characteristic patchy distribution of mustards, a relatively diverse and important plant family. This result challenges one end of the continuum of the long-standing Plant Apparency hypothesis, which essentially states the opposite causation, that low molecular weight toxins like GS are evolutionary responses of patchy distributions and correlated life-history traits.
David H Siemens; Riston Haugen; Steven Matzner; Nicholas Vanasma
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2009-10-27
Journal Detail:
Title:  Molecular ecology     Volume:  18     ISSN:  1365-294X     ISO Abbreviation:  Mol. Ecol.     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2010-01-18     Completed Date:  2010-02-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9214478     Medline TA:  Mol Ecol     Country:  England    
Other Details:
Languages:  eng     Pagination:  4974-83     Citation Subset:  IM    
Integrative Genomics Program and Department of Biology, Black Hills State University, 1200 University St., Spearfish, SD 57799, USA.
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MeSH Terms
Brassicaceae / metabolism*
DNA, Plant / genetics
Evolution, Molecular*
Genetic Variation*
Genetics, Population
Glucosinolates / analysis
Microsatellite Repeats
Models, Statistical
Population Dynamics
Sequence Analysis, DNA
Grant Support
2 P20 RR016479/RR/NCRR NIH HHS
Reg. No./Substance:
0/DNA, Plant; 0/Glucosinolates

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