Pollen carryover, geitonogamy
, and the evolution of deceptive pollination systems in orchids.
There were no significant differences in average number of matured pods per raceme, percentage of matured and aborted pods between bagged self pollinated flowers, cross pollinated flowers, Geitonogamy
, and open pollinated flowers.
The reproductive system experiment included four pollination treatments: autogamy (A), geitonogamy
(G), xenogamy (X), and open control (O).
2009), assigned to the mode of propagation, geitonogamy
(pollination between different flowers of the same plant), as well as apomixis (PAIVA NETO et al.
The next day, the bags were removed and the stigmas were brushed with the freshly dehisced anthers from the flowers of the same tree and re-bagged to know whether fruit set occurs through geitonogamy
The negative effect may occur due to: 1) competition with native pollinators, which decreases the number of flower visits by effective pollinators; 2) removal of pollen grains previously deposited on the stigma; 3) low fidelity and pollen loss due to deposition on other species; 4) differences in flower visit rates on male and female flowers, resulting in a low transferred pollen rate; 5) pollen and nectar stealing behaviour without accomplishing pollination; 6) rise of high geitonogamy
rates; and 7) deposits of heterospecific pollen, which competes on the stigma for co-specific pollen.
We performed the following five treatments: self-pollination, spontaneous self-pollination, geitonogamy
, xenogamy and agamospermy.
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.
can be due to self-pollination between flowers on the same branch, different flowering branches of the same plant, or different ramets of the same clonal genet.
In Eichhornia paniculata, outcrossing success through male function actually declined with inflorescence size, a pattern attributable to high levels of geitonogamy
on large inflorescences (Harder and Barrett 1995).
To confirm our suspicion that coneflower is self-incompatible, we compared seed production following three bagging/pollination treatments, bagged heads/no artificial pollination (testing auto-geitonogamy
combined with genetic self-compatibility), bagged/ artificial geitonogamy
(testing genetic self-compatibility), and unbagged heads (testing combined effects of geitonogamy
and cross pollinations).
Culley, 2000, 2002) as well as geitonogamy