Variation in pollen production and pollen viability in natural populations of gynodioeciousBeta vulgarisssp.maritima: evidence for a cost of restoration of male function?
| Autor: | I. De Cauwer, Jean-François Arnaud, Mathilde Dufay, V. Vaudey, Pascal Touzet, Joël Cuguen |
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| Rok vydání: | 2007 |
| Předmět: |
0106 biological sciences
0303 health sciences Cytoplasmic male sterility food and beverages Gynodioecy Biology medicine.disease_cause 010603 evolutionary biology 01 natural sciences 03 medical and health sciences Homogeneous Pollen Botany medicine Allele Beta (finance) Ecology Evolution Behavior and Systematics Sex ratio Function (biology) 030304 developmental biology |
| Zdroj: | Journal of Evolutionary Biology. 21:202-212 |
| ISSN: | 1010-061X |
| DOI: | 10.1111/j.1420-9101.2007.01454.x |
| Popis: | Gynodioecious species are defined by the co-occurrence of two clearly separated categories of plants: females and hermaphrodites. The hermaphroditic category may, however, not be homogeneous, as male fitness may vary among hermaphrodites as a result of many biological factors. In this study, we analysed estimates of pollen quantity and viability in the gynodioecious Beta vulgaris ssp. maritima, comparing hermaphrodites bearing a male-fertile cytotype and hermaphrodites bearing cytoplasmic male sterility (CMS) genes, which are counteracted by nuclear restoration factors. We show that: (i) pollen quantity continuously varies among restored hermaphrodites, suggesting a complex genetic determination of nuclear restoration; (ii) pollen viability was lower in restored (CMS) hermaphrodites than in non-CMS hermaphrodites, probably because of incomplete restoration in some of these plants; and (iii) pollen quantity and viability also varied among hermaphrodites with male-fertile cytotypes, possibly a result of a silent cost of restoration. Finally, we discuss the consequences of these results for pollen flow and the dynamics of gynodioecy. |
| Databáze: | OpenAIRE |
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