The percentage of flowers that formed siliques was highest in the free visitation treatment at Estrela and Esmeralda, while at Guarani das Missoes, the treatment showing the highest percentage of silique formation was xenogamy
(see Table 1).
The reproductive system experiment included four pollination treatments: autogamy (A), geitonogamy (G), xenogamy
(X), and open control (O).
Furthermore, it is also noticeable the diversity of traits inherent in this genus, the species differing in longevity (therophytes to chamaephytes), flower colour (white, pink, yellow, orange) and size, flower biology (cleistogamy and chasmogamy) and breeding and mating systems (autogamy, xenogamy
, self-compatibility, self-incompatibility) (Arrington & Kubitziky 2003, Rodriguez-Perez 2005).
Significance difference between the percentages obtained from xenogamy
, autogamy and the control experiments were evaluated by comparison formula between two percentages, with a 5% significance difference level (PAGANO; GAUVREAU, 2004).
(n=9): un-opened flowers were emasculated before the anthers reached maturity.
We performed the following five treatments: self-pollination, spontaneous self-pollination, geitonogamy, xenogamy
Treatment 2) The flower was emasculated as above, but not bagged, so that seeds that matured would be the result of either geitonogamy (in which an ovule is fertilized by pollen from a different flower on the same plant) or xenogamy
(in which the pollen is transferred from a different individual), but not intrafloral self-pollination.
Different flower sexes and breeding systems have been reported for Bromeliaceae (Table 1) ranging from bisexual flowers to unisexual flowers and from xenogamy
NEXT PROJECT: "Look into the Past with Madame Xenogamy
," an installation at Dance Theater Workshop this spring.
P/O ratio was extremelly high for both group of stamens, indicating obligate xenogamy
as the main reproductive system (Table 2).
cross-fertilization is outbreeding, allogamy and xenogamy
The shift from xenogamy
to autogamy was more pronounced than the shift from autogamy to xenogamy