الفهرس 
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Abstract
Emad Hamed Ibrahim Mahmoud El-Bassel: Studies on Sex Compatibility between LeConte and some other Pear Cultivars. Unpublished M. Sc. Thesis, Department of Horticulture, Faculty of Agriculture, Ain Shames University, 2010.
This study was carried out during 2005, 2006 and 2007 seasons on four pear cultivars Pyrus communis (LeConte, Hood, Flordahome and Pineapple). The purpose of this study was to determine the degree of self and cross-compatibility or incompatibility between these cultivars and Le-Conte cultivar via following pollen germination on stigma and pollen tube growth throughout style by fluorescence microscopy, fertilization, embryo sac development, fruit set and fruiting percentages. Effect of self, cross, open and no pollination (parthenocarpy) on initial fruit set percentage, fruiting percentage and fruit properties were studied on Le-Conte fruit.
The results confirmed that Le-Conte cultivar is self-incompatible and cross incompatible with Flordahome and Pineapple cultivars while, it is cross-compatible with Hood cultivar although, these cultivars exhibited high pollen viability. Moreover, histological studies indicated that the ovule after five days in compatible cross developed and increase in size followed formation of zygote and primary endosperm seven days after anthesis compared to the unfertilized ovule did not increase ten days after incompatible cross.
The highest significant initial fruit set, fruiting percentage, fruit weight, fruit volume and number of seeds per fruit for Le-Conte fruit were obtained after cross compatible with Hood comparing with the other treatments. Results showed a proportional relationship between fruit weight, volume and number of seeds per fruit. Fruit shape index, firmness, S.S.C, titratable acidity, and S.S. C/ acid ratio were influenced by different pollination treatments. Le-Conte is slightly inclined to parthenocarpy, moreover; parthenocarpic fruits were poor in their properties.
Key Words: Pyrus commuins, Self and cross pollination, incompatibility, pollen viability, pollen tube growth, fruit set, parthenocarpy, fruit properties.