Abstract:

The cross-compatibility experiments of 91 inter-specific combinations and 21 inter-generic combinations were carried out among 7 Eriobotrya plants and 2 related genera（Raphiolepis indica Lindl. and Photinia serrulata Lindl.）by emasculation，bagging，and artificial pollination. The results showed 28 in 91 inter-specific combinations set no fruit，which means nearly 30% was incompatible. In the rest combinations，most of them were partial cross-compatibility，a few of them were complete cross- compatibility. The cross between Eriobotrya and its related genera plants（R. indica Lindl. and P. serrulata Lindl.）were incompatibility. The back cross of them have 5 compatible combinations could set fruits，which incompatibility developed. The F₁ plants could obtain only after embryo rescue. Various species as male or female got difference fruit setting ratio，E. prinoides Rehd. & Wils.，common loquat（E. japonica）and Eriobotrya × daduheensis H. Z. Zhang ex W. B. Liao，Q. Fan et al. as female plant got 36.2%–58.2% average fruit-setting ratio；while E. deflexa Nakai and its two forms，and E. elliptica Lindl. as female plant just got 2.9%–16.3% average fruit-setting ratio，but got as high as 22.4%–43.1% average fruit-setting ratio when they used as male plant. Fluorescent observation of pollen tube growth showed that no fruit-setting from E. deflexa f. koshunensis Nakai × E. prinoides Rehd. & Wils. might be derived from the sporophyte incompatibility.

Key words: Eriobotrya, distant hybridization, compatibility, sporophyte incompatibility