Summary
A major barrier to hybridization of some Ipomoea species is located at the stigma-style interface. In 5 interspecific combinations examined with the aid of fluorescence microscopy, pollen was found to germinate and penetrate the stigma surface without, however, passing into the style. In the cross I. hederacea x 1. purpurea, pollen tubes were observed in the style and capsules were set, but no full seeds were produced. Attempts to facilitate hybridization among Ipomoea species using mentor pollen-foreign pollen mixes were unsuccessful.
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Guries, R.P. A test of the mentor pollen technique in the genus Ipomoea . Euphytica 27, 825–830 (1978). https://doi.org/10.1007/BF00023720
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DOI: https://doi.org/10.1007/BF00023720