Treatment Number of Number of % flowers fruits formed Hand cross-pollination 54 30 55.55 a Hand
self-pollination 65 2 3.27 c Spontaneous
self-pollination 35 0 0.00 d Control--open pollination 145 46 31.50 b Index of Self-Incompatibility (ISI) 0.06 Reproductive Efficacy (RE) of 0.57 Pollinators Different letters in the same column indicate significant differences at P < 0.05--Fisher's exact test.
The high fruit production in treatments with spontaneous
self-pollination and manual
self-pollination confirms that 'Bordo' cv.
In the natural population of that species, no difference was observed between the fruit set resulting from spontaneous
self-pollination and the one resulting from open pollination ([greater than or equal to] 92.2%; Table 1).
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).
Abiotic and
self-pollination are used for local pollination for the second rule.
Although the findings indicate that stigma receptivity and release of pollen occur at the same time, there is a lesser chance for
self-pollination as the stigma of S.
(2) Abiotic
self-pollination process forms the basis of local pollination.
First, damaged plants might experience a reduced cost of
self-pollination because they experience very low levels of self-pollen movement, or are highly pollen limited.
Relative to
self-pollination, outcross pollination results in greater proportion of flowers setting fruit, and greater proportion of ovules yielding seeds per fruit.
Limitations to the occurrence of
self-pollination were verified in all anthesis stages regarding the evaluated Hyola 432 flowers.
It is clear though that the number of seeds produced by the
self-pollination treatments were consistently lower than those from the cross pollination treatments and reproductive success would be better estimated by taking into account not only fruit and seed sets, but seed germination as well.