Artículo
Reproductive biology of the dioecious Canary Islands endemic Withania aristata (Solanaceae)
Anderson, Gregory; Bernardello, Gabriel Luis Mario
; Opel, Matthew R.; Santos-Guerra, Arnoldo; Anderson, Mona
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Fecha de publicación:
12/2006
Editorial:
Botanical Society of America
Revista:
American Journal of Botany
ISSN:
0002-9122
e-ISSN:
1537-2197
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We confirmed functional dioecy of Withania aristata via field and greenhouse studies. Male flowers are significantly larger. Female flowers bear stamens with no pollen; males bear 220 000 grains. Stigmata of male flowers senesce in buds. Anatomical observations confirm more ovules in females and an ovarian nectary in both sexes. We detected nectar in female flowers in the<br />greenhouse but found no nectar in males. Thus, males offer pollen and females nectar. Females bear large numbers of fruits and, infrequently, male plants bear few significantly smaller fruits with few seeds. Outcrosses of females (self crosses impossible without pollen) yielded fruits in young buds, older buds, and open flowers. Self crosses of male flowers succeeded only with very<br />young buds. Although functionally dioecious, this species manifests self-compatibility; however, no fruits are produced autonomously. Bee species (Lassioglossum, Amegilla, Apis) visit flowers and mature buds. Bud visits in which bees force petal tips apart, coupled with self-compatibility, may explain infrequent fruit on males. Thus, dioecy in W. aristata seems to have evolved from self-compatible ancestors, that leaky dioecy may have been favored during colonization, and, that despite autogamy and a low floral visition rate, this endemic enjoys a high rate of reproductive success.
Palabras clave:
Bees
,
Canary Islands
,
Dioecy
,
Leaky Dioecy
Archivos asociados
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Identificadores
Colecciones
Articulos(IMBIV)
Articulos de INST.MULTIDISCIPL.DE BIOLOGIA VEGETAL (P)
Articulos de INST.MULTIDISCIPL.DE BIOLOGIA VEGETAL (P)
Citación
Anderson, Mona; Santos-Guerra, Arnoldo; Opel, Matthew R.; Bernardello, Gabriel Luis Mario; Anderson, Gregory; Reproductive biology of the dioecious Canary Islands endemic Withania aristata (Solanaceae); Botanical Society of America; American Journal of Botany; 93; 9; 12-2006; 1295-1305
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