Biology of Pollination
Pollination is the event of pollen landing on a stig-
matic surface such as the pistil, and fertilization is the
union of the staminate chromosomes from the pollen with
the pistillate chromosomes from the ovule.
Pollination begins with dehiscence (release of pollen)
from staminate flowers. Millions of pollen grains float
through the air on light breezes, and many land on the
stigmatic surfaces of nearby pistillate plants. If the pistil is
ripe, the pollen grain will germinate and send out a long
pollen tube much as a seed pushes out a root. The tube
contains a haploid (in) generative nucleus and grows
downward toward the ovule at the base of the pistils.
When the pollen tube reaches the ovule, the staminate
haploid nucleus fuses with the pistillate haploid nucleus
and the diploid condition is restored. Germination of the
pollen grain occurs 15 to 20 minutes after contact with
the stigmatic surface (pistil); fertilization may take up to
two days in cooler temperatures. Soon after fertilization,
the pistils wither away as the ovule and surrounding calyx
begin to swell. If the plant is properly watered, seed will
form and sexual reproduction is complete. It is crucial that
no part of the cycle be interrupted or viable seed will not
form. If the pollen is subjected to extremes of tempera-
ture, humidity, or moisture, it will fail to germinate, the
pollen tube will die prior to fertilization, or the embryo
will be unable to develop into a mature seed. Techniques
for successful pollination have been designed with all these
criteria in mind.
Not sure if you had a look at this or not.
Here is the the link in which it came from...
HIGHGRADE DISCUSSION FORUMS - I bit you might like to know on MJ botany
Hope it helps somewhat.