| ŠMARDA, Petr, Lucie HOROVÁ, Petr BUREŠ, Ivana HRALOVÁ a Michaela MARKOVÁ. Stabilizing selection on genome size in a population of Festuca pallens under condition of intensive intraspecific competition. New Phytologist. New Phytologist Trust, 2010, roč. 187, Special Is, s. 1195-1204. ISSN 0028-646X. |
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@article{898804,
author = {Šmarda, Petr and Horová, Lucie and Bureš, Petr and Hralová, Ivana and Marková, Michaela},
article_number = {Special Is},
keywords = {DNA content; flow cytometry; genome size evolution; germination success; intraspecific competition; seed weight; stabilizing selection; vegetative performance},
language = {eng},
issn = {0028-646X},
journal = {New Phytologist},
title = {Stabilizing selection on genome size in a population of Festuca pallens under condition of intensive intraspecific competition},
url = {http://onlinelibrary.wiley.com/doi/10.1111/j.1469-8137.2010.03335.x/abstract},
volume = {187},
year = {2010}
}
TY - JOUR
ID - 898804
AU - Šmarda, Petr - Horová, Lucie - Bureš, Petr - Hralová, Ivana - Marková, Michaela
PY - 2010
TI - Stabilizing selection on genome size in a population of Festuca pallens under condition of intensive intraspecific competition
JF - New Phytologist
VL - 187
IS - Special Is
SP - 1195-1204
EP - 1195-1204
PB - New Phytologist Trust
SN - 0028646X
KW - DNA content
KW - flow cytometry
KW - genome size evolution
KW - germination success
KW - intraspecific competition
KW - seed weight
KW - stabilizing selection
KW - vegetative performance
UR - http://onlinelibrary.wiley.com/doi/10.1111/j.1469-8137.2010.03335.x/abstract
N2 - Stabilizing selection is a key evolutionary mechanism for which there is relatively little experimental evidence. To date, stabilizing selection has never been observed at the whole-genome level. We tested the effect of selection on genome size in a field experiment using seeds collected in a population of Festuca pallens with a highly variable genome size. Using flow cytometry, we measured the genome size in germinating seedlings and juvenile plants grown with or without high intraspecific competition (908 individuals). Above-ground biomass and leaf number were used as measurements of individual vegetative performance. The possible confounding effect of seed weight was controlled for in a separate experiment. Growth under high competition had a significant stabilizing effect on genome size. Because no relationship was observed between genome size and vegetative performance, we assume that the elimination of plants with extreme genome sizes was the result of decreased survival as a consequence of some unrecognized stress. Our results indicate that genome size may be under direct selection. The equal disadvantaging of either large or small genomes indicates that the selection for optimum genome size in species may be fully context dependent. This study demonstrates the power of competition experiments for the detection of weak selection processes.
ER -
ŠMARDA, Petr, Lucie HOROVÁ, Petr BUREŠ, Ivana HRALOVÁ a Michaela MARKOVÁ. Stabilizing selection on genome size in a population of Festuca pallens under condition of intensive intraspecific competition. \textit{New Phytologist}. New Phytologist Trust, 2010, roč.~187, Special Is, s.~1195-1204. ISSN~0028-646X.
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