Abstract
Pistil and pollen behavior during self- and cross-pollinations in 10 inbred almond seedlings with self-compatible genotypes and self-incompatible phenotypes were studied. Pollen from these inbred seedlings was examined for the pollen tube growth in self and non-self styles, while pistils from these seedlings were tested for their ability to support self and non-self pollen tube growth. Pistils and pollen of inbred genotypes were compatible with unrelated genotypes but the pistils were unable to support the growth of related pollen, which showed a slower tube growth rate. This may be a consequence of inbreeding, resulting in a silenced self-compatibility or cryptic self-incompatibility in some genetically self-compatible genotypes. This reaction would be a mechanism favoring crossing with unrelated genotypes and reducing inbreeding in future generations.
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