Study on inbreeding degeneration in Japanese pear by using S2 progeny originated from Osa Nijisseiki having self-compatibility

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Almost all fruits trees including Japanese pear have self-incompatibility. In this research, to study inbreeding degeneration, we produced self-pollinated progeny of Japanese pear by using self-compatible cultivar Osa Nijisseiki. The negative correlation observed between the homo-zygosity and plant height in S2 individuals reflected a negative effect of the homogeneity on their growth. This S2 progeny may become valuable material for the genomic research about the inbreeding degeneration in Japanese pear.