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Title

Seed dormancy distribution: explanatory ecological factors

Publication Year

2012

Author(s)
  • Wagmann, Kristen
  • Hautekeete, Nina-Coralie
  • Piquot, Yves
  • Meunier, Cecile
  • Schmitt, S. Eric
  • Van Dijk, Henk
Source
ANNALS OF BOTANY Volume: 110 Issue: 6 Pages: 1205-1219 Published: 2012
ISSN
0305-7364
Abstract

Knowledge of those traits that vary with latitude should be helpful in predicting how they may evolve locally under climate change. In the sea beet Beta vulgaris ssp. maritima, seed dormancy largely controls the timing of germination, is highly heritable and varies geographically; it is therefore thought to be selected by climate. The aim here was to characterize the variation in seed dormancy among sea beet populations across the French distribution area, as well as the ecological factors in situ that are correlated with and that could therefore select for seed dormancy. The relative importance of genetic inheritance vs. non-genetic variation is also evaluated. The proportions of dormant seeds from 85 natural populations encompassing different climates over the whole French distribution area were measured under controlled conditions. Germination phenology was observed in a common garden experiment. Dormancy variation of seeds collected in situ was compared with that of seeds collected on plants grown in the greenhouse. The proportions of dormant seeds in the greenhouse were highly variable, covering almost the entire range from 0 to 1, and followed a geographical pattern from lower dormancy at high latitudes to high dormancy at low latitudes. The distribution of dormancy was positively correlated with yearly temperatures, especially summer temperatures. Minimum temperatures in winter did not significantly explain the trait variation. The genetic component of the total variation was significant and is probably completed by an important adjustment to the local conditions brought about by maternal adaptive phenotypic plasticity. Dormancy in sea beet could be interpreted as a way to limit summer germination and spread germination over the first autumn and spring or following autumns. This highly heritable trait has the potential to evolve in the relatively near future because of climate change.

Author Keyword(s)
  • Beta vulgaris ssp
  • maritima
  • trait distribution
  • seed dormancy
  • germination phenology
  • life history
  • ecological factors
  • seasons
  • climatic factors
  • latitudinal gradient
  • climate change
KeyWord(s) Plus
  • VULGARIS SSP MARITIMA
  • RAPID CLIMATE-CHANGE
  • ARABIDOPSIS-THALIANA
  • LIFE-HISTORY
  • SUGAR-BEET
  • WILD BEET
  • NATURAL-SELECTION
  • DESERT ANNUALS
  • GERMINATION
  • ADAPTATION
ESI Discipline(s)
  • Plant & Animal Science
Web of Science Category(ies)
  • Plant Sciences
Adress(es)

[Wagmann, Kristen; Hautekeete, Nina-Coralie; Piquot, Yves; Schmitt, S. Eric; Van Dijk, Henk] Univ Lille 1, CNRS, UMR 8198, Lab Genet & Evolut Populat Vegetales, F-59655 Villeneuve Dascq, France; [Meunier, Cecile] Univ Montpellier 2, ISEM, CNRS, UMII,UMR 5554,CC 065, F-34095 Montpellier 05, France

Reprint Adress

Hautekeete, NC (reprint author), Univ Lille 1, CNRS, UMR 8198, Lab Genet & Evolut Populat Vegetales, F-59655 Villeneuve Dascq, France.

Country(ies)
  • France
CNRS - Adress(es)
  • Evolution, Ecologie et Paléontologie (Evo-Eco-Paleo), UMR8198
  • Institut des Sciences de l'Evolution de Montpellier (ISEM), UMR5554
Accession Number
WOS:000310371800011
uid:/G1QFG16Z
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