Molecular Aspects of Self-incompatibility in the Solanaceae
Many species of flowering plants have evolved genetically controlled mechanisms to prevent inbreeding. Fertilization in flowering plants involves a complex series of interactions between the haploid pollen which contains the male gametes, and the diploid tissues of the female pistil. Flowers are often hermaphroditic bearing the male and female organs in close proximity, so that the effectiveness of these mechanisms in preventing self-fertilization and promoting outcrossing is particularly important. Self-incompatibility (SI) is one of the most widespread mechanisms for preventing self-fertilization. It is the inability of seed plants to produce viable seeds after self-pollination. Study of the mechanism of self-incompatibility is not only of interest in relation to pollination but also as a model system for understanding cell-cell recognition in higher plants.
KeywordsPollen Tube RNase Activity Active Site Histidine Style RNases Allelic Specificity Determinant
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