| Sumario: | The availability of pollen in sorghum (Sorghum bicolor [Moench] L.) production
is generally not considered a restrictive factor due to the sorghum self-pollination
process. However, during the cross pollination process restrictions could play a role that
depends on the distance of the pollen source, the proportion of male to female plants
and the sowing date. The objective of this experiment was to establish the relationship
between pollen production, deposition and season variations in seed set under different
proportion male:female rows. The A9/B9-line was sowed on May 3, June 10, 2005,
with the proportions: 2:4, 2:6 andon April 3, 2006 with proportions of 2:12 and 2:16
in Montecillo, State of Mexico. In isolines, number of flowers per panicle was measured
at the ending of flowering. During all the flowering period, pollen production was
quantified in male line and pollen deposition on female line rows using passive traps.
During harvest the length of panicle was measured, quantified by the number of seeds
per panicle and seed set was estimated. The pollen availability, synchrony floral, duration
of phenological stage and seed production were influenced by sowing date and varied
with the male and female rows. Precocity was observed in A9 female isoline more than
B9-male line in three sowing dates. Number of pollen grains and seeds declined proportionally
with increasing distance from the pollen source, but the rate was different for
each proportion. The pollination was associated more to the size of pollen source and its
dispersion than with population of female plants.
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