Abstract
Self-incompatibility (SI) has been widely investigated at both molecular and cellular levels in pear. This trait is controlled by a single multi-allelic locus encoding at least two components from the pollen and the pistil. The stylar-S determinant is an S-glycoprotein (S-RNase) that can inhibit pollen tube growth in a self-pistil, and induces a series of changes in reactive oxygen species (ROS), calcium (Ca2+), actin cytoskeleton, and phosphatidic acid, leading to programmed cell death in incompatible pollen tubes. At present, a total of 67 S-RNase genes have been identified and have served in selecting appropriate pollinators in pear orchards. The pollen-S determinant has also been investigated in pear. Although a group of F-box genes have been identified in the S-locus, it remains unclear as to which gene(s) are involved in self-incompatibility reactions. In pear, only a few cultivars have experienced loss of self-incompatibility, due to either stylar or pollen mutations, or due to polyploidy. Except for the deletion of S4-RNase in cultivar Osa-Nijisseiki, other stylar-tissue mutations, including abnormal expression and post-transcript modification, are difficult to study, and are yet to be explained at the molecular level. Similarly, the mechanism of pollen tissue mutation and polyploidy require further investigations in future studies.
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Zhang, S., Gu, C. (2019). Self-incompatibility in Pear. In: Korban, S. (eds) The Pear Genome. Compendium of Plant Genomes. Springer, Cham. https://doi.org/10.1007/978-3-030-11048-2_10
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DOI: https://doi.org/10.1007/978-3-030-11048-2_10
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