The high fruit production in treatments with spontaneous self-pollination
and manual self-pollination
confirms that 'Bordo' cv.
Flowers within a plant were assigned to the following treatments: (1) agamospermy (flowers had their stigma removed at the beginning of anthesis); (2) autonomous self-pollination
(un-manipulated bagged flowers); (3) hand self-pollination
(flowers hand-pollinated with their own pollen); (4) hand cross-pollination (previously emasculated flowers hand-pollinated with pollen from another plant), and (5) natural pollination (un-manipulated and randomly selected flowers exposed to pollinators in the field).
The use of self-pollination
to assist the selection of germination uniformity and increased emergence speed in passion fruit should be a goal of future studies.
For Arabica, it has been assumed that the wind carried the pollen between plants, and for Robusta wind and automatic self-pollination
This evidence becomes stronger because the manual self-pollination
presented the second best rate of initial fruit set, implying the existence of a strong autogamy in this species.
These characteristics suggest that the tree species is adapted for crosspollination which is further substantiated by the lack of fruit set in manual self-pollination
The Self-compatibility and automatic self-pollination
is a common phenomenon in many species of Fabaceae (BORGES, 2006; JACOBI et al.
Considering the discrepancy of this result with those of other studies and the fact that in evolutionary terms, self-pollination
does not appear as a survival strategy, it can be hypothesized that this result may be associated with a deficiency in the attraction and the abundance or dispersal of pollinators.
However, production of achenes alone is not a good measure of reproductive success of Asteraceae, especially when flowers are self-pollinated, because a high percentage of achenes produced by self-pollination
do not contain an embryo (Nielsen et al.
Considering the effect of self-pollination
on the levels of soluble solids, the depression was more pronounced for the self obtained from SP88-869 and SP90-1314, while depression was null for the self-pollinations
of CTC95-106, IAC91-2202, SP88-920, SP90-1501, SP90-1517, SP90-1616, SP91-3637, SP92-1583, SP94-3374, SP95-1005, SP95-3184, WI78455.
To the studied sunflower hybrids, determinations were performed in view to establish the flowering period and duration of this stage, the nectar secretion and sugar nectar concentration in view to calculate the potential honey yield, as well as the number of seeds per sunflower head isolated from insects and number of seeds per sunflower head free-pollinated in view to calculate the degree of self-pollination
and to establish if there is a correlation between the self-pollination
and the melliferous potential.
We performed the following five treatments: self-pollination
, spontaneous self-pollination
, geitonogamy, xenogamy and agamospermy.