Studies on palynological features and In Vitro pollen tube growth in some Gossypium species

摘要

Area, equivalent diameter, perimeter and roundness of the pollen grains were studied in seven diploid wild species and two tetraploid species of the genus Gossypium. The size of the pollen grain is correlated with ploidy level and pollen grains of the tetraploid species arc larger than diploid Species. Significant difference for the above characters were noticed in the pollen grains of the different species belonging to the same pioidy level. The germinaled pollen grain in artificial medium produced longer pollen tube at initial period. The relationship between pollen size and breeding value are discussed.