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

包括日本梨在内的几乎所有果树都具有自交不亲和性。 本研究以日本梨自交亲和品种大砂二世星为材料，通过自交后代的选育，研究了日本梨自交退化的原因。 S2个体的纯合性与株高呈负相关，反映了纯合性对其生长的负面影响。 该S_2代后代可能成为研究日本梨近交退化的基因组学材料。

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.