Apple Stylar Proteins Related to Gametophytic Self-incompatibility

Identification of stylar RNases associated with gametophytic self-incompatibility in almond (Prunus dulcis).

Stylar proteins of 13 almond (Prunus dulcis) cultivars with known S-genotypes were surveyed by IEF and 2D-PAGE combined with immunoblot and N-terminal amino acid sequence analyses to identify S-RNases associated with gametophytic self-incompatibility (SI) in this plant species. RNase activities corresponding to Sa and Sb, two of the four S-alleles tested, were identified by IEF and RNase activi...

Gametophytic Self-Incompatibility in Petunia

Gametophytic self-incompatibility (GSI), which prevents growth of a pollen tube through the style, provides a means of preventing self-pollination. Seen in most eudicot plant families, GSI in the genus Petunia was described by Darwin in the 19th century. By the time the first edition of this monograph was published in 1984, nearly a century later, most of the readily observable phenomena associ...

Protein Interactions in S-RNase-Based Gametophytic Self-Incompatibility

Loss of gametophytic self-incompatibility with evolution of inbreeding depression.

Gametophytic self-incompatibility (SI) in plants is a widespread mechanism preventing self-fertilization and the ensuing inbreeding depression, but it often evolves to self-compatibility. We analyze genetic mechanisms for the breakdown of gametophytic SI, incorporating a dynamic model for the evolution of inbreeding depression allowing for partial purging of nearly recessive lethal mutations by...

Gametophytic Self-Incompatibility: A Mechanism for Self/Nonself Discrimination during Sexual Reproduction.

Various mechanisms in flowering plants have evolved to prevent the tendency of self-fertilization created by close proximity of male and female reproductive organs in a perfect flower. One such mechanism, called self-incompatibility (SI), allows the pistil of a plant to reject self pollen or pollen from genetically related individuals, thus preventing inbreeding and promoting outcrosses. Geneti...