Barriers to interspecific hybridization
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Aland A. Ager; Raymond P. Guries
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Article
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1982
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Springer
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English
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Crossability barriers between the tetraploid Ulmus americana and five other diploid elm species were investigated using both fluorescence and scanning electron microscopy. Both pollen germination and pollen tube development were inhibited in all interspecific crosses. Pollen tube behavior on the sti