est un tiré à part de
| Titre : |
An isozyme study of clone diversity and relative importance of sexual and vegetative recruitment in the grass Brachypodium pinnatum |
| Type de document : |
Tiré à part de revue |
| Auteurs : |
F. Schläpfer ; Michael Fischer |
| Année de publication : |
1998 |
| Importance : |
351-360 |
| Langues : |
Anglais (eng) |
| Catégories : |
[CBNPMP-Thématique] Forme de vie et structure de la population végétale
[CBNPMP-Thématique] Système de reproduction
[CBNPMP-Thématique] Variabilité en protéines, polymorphisme enzymatique
|
| Mots-clés : |
Brachypodium pinnatum (L.) P. Beauv. Brachypodium rupestre |
| Résumé : |
We asked wether differences in abundance and seed production of Brachypodium pinnatum after 16 years of four different experimental land use regimes were reflected in differences in vegetative distance clone diversity, clone area, and the proportions of sexual and vegetative recruitments. Mean vegetative dispersal distance was 5,5mm yr-1. Electrophoresis of 5 polymorphic isozyme loci of 20 tillers sampled at defined positions in each of twelve 1x6m sampling areas (3 per treatment) revealed considerable clonal diversity. Per sampling area we found on avarage 9,98 ensyme phenotypes (clones), mean Simpson index was 0,825 and mean Shannon index 0,801. The mean ratio of sexual vs vegetative recruitment was about 1:32 000. Despite this low ratio, clonal diversity within the population of B. pinnatum was higher than reported for clonal plant populations, possibly because of its high ramet densities. Mean clone area was 5,73m² i.e. mean clone radius was 1,35m. None of the 10 pairswise correlation between abundance and eed production on the one hand, and number of clones per plot sample, plot Simpson index, plot Shannon index, ratio of vegetative vs sexual recruitment and clone area on the other, was significant. Mean clone radius was 245 times larger than the mean distance of yearly vegetative dispersal wich suggest old ages and low turnover rates of clones. The time scale of the inert response of clonal diversity of B. pinnatum to changes in land use appears lo largely exceed the experimental period of 16 years. |
| Lien pérenne : |
DOI : 10.1111/j.1600-0587.1998.tb00400.x  |
| Permalink : |
https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=130524 |
Schläpfer, F., Fischer, Michael
1998
An isozyme study of clone diversity and relative importance of sexual and vegetative recruitment in the grass Brachypodium pinnatum.
Ecography, 21(4)
: 351-360.
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