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The Gametophytic Self-Incompatibility system, its impact on pear (Pyrus communis L.) cultivation, and the utilization of the wild Syrian pear (Pyrus syriaca) as a "universal pollinator";

In: Israel Journal of Plant Sciences
Authors:
Annat Zisovich Department of Molecular Genetics and Northern R&D, MIGAL–Galilee Technology Center
Dept. of Horticulture, Faculty of Agriculture, The Hebrew University of Jerusalem

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Raphael A. Stern Department of Molecular Genetics and Northern R&D, MIGAL–Galilee Technology Center

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Martin Goldway Department of Molecular Genetics and Northern R&D, MIGAL–Galilee Technology Centergoldway@migal.org.il

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The current understanding of the RNase-mediated Gametophytic Self-Incompatibility (GSI) system in pears is presented. A practical outcome of GSI research is the ability to S-genotype cultivars molecularly. In Israel the main pear cultivar is ‘Spadona’; ‘Cocsia’, ‘Gentile,’ and ‘Spadochina’ serve as its pollenizers. However, yields are relatively low, probably, at least in part, because of genetic semi-compatibility, which causes rejection of half of the pollen grains that reach the ‘Spadona’ flowers. The wild pear Pyrus syriaca, which is endemic to Israel, flowers in parallel to the cultivated European pear varieties, and is expected to be compatible with them. We are currently examining P. syriaca trees in the northern part of Israel, to see if they could serve as efficient pollenizers for the cultivated pears in Israeli orchards.

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