how long do you think the pollen grains retain viability
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they r different for different plants.in cereals like rice and wheat the viability is lost within 30 minutes of their release and in some members of rosaceae,leguminoseae and solanaceae they maintain viability for months.
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The period for which pollen grains remain viable is highly variable and to some extent depends on the prevailing temperature and humidityThe pistil is developed and ovules reach maturity before the pollen grains are ripe. ... hybrid seed production as soon as tomato hybrid cultivars gained popularity, ... ordinary conditions of storage pollen viability can hardly be retained .
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