[article]
| Titre : |
Pollen-ovule ratio, pollen size, and breeding system in Astragalus (Fabaceae) subgenus Epiglottis : a pollen and seed allocation approach |
| Type de document : |
Imprimé |
| Auteurs : |
Rafael Gallardo ; Eugenio Dominguez ; Jesús M. Munoz |
| Année de publication : |
1994 |
| Article en page(s) : |
1611-1619 |
| Langues : |
Anglais (eng) |
| Catégories : |
[CBNPMP-Thématique] Biologie de la reproduction
[CBNPMP-Thématique] Pollinisateur
|
| Mots-clés : |
Astragalus |
| Résumé : |
The correlation between pollen/ovule (P/O) ratio and breeding system has generally been accounted for either on the basis that P/O reflects pollination efficiency, or in terms of the sex allocation theory. The following were assessed for taxa belonging to genus Astragalus subgenus Epiglottis: 1) Degree of correlation between P/O and the breeding system, measured by means of autofertility; 2) The absence or existence of correlation between P/O and pollen grain size; and 3) The ability of various theories to account for the results obtained. Results showed a minimal correlation between P/O and autofertility, and between P/O and pollen grain size in the taxa studied. Analysis of these results in terms of the sex allocation theory enabled this correlation to be explained as a function of the variation existing between taxa with respect to the resources invested in each pollen grain and in each ovule. The predictive capacity of this theory, which has moreover proven valuable in explaining the structural peculiarities of the androecium in these taxa, was also highlighted. The type of self-pollination applicable was also discussed, as was the phenotypic model of selection of self-fertilization considered most plausible for these taxa. |
| Identifiant : |
DOI : 10.1002/j.1537-2197.1994.tb11473.x  |
| Permalink : |
https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=137536 |
in American Journal of Botany > 81 (12) (1994) . - 1611-1619
Gallardo, Rafael, Dominguez, Eugenio, Munoz, Jesús M.
1994
Pollen-ovule ratio, pollen size, and breeding system in Astragalus (Fabaceae) subgenus Epiglottis : a pollen and seed allocation approach.
American Journal of Botany, 81(12): 1611-1619.
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