Examination of Self- and Cross-incompatibility in Citrus

Self and cross-incompatibility/compatibility of citrus were determined by pollen tube growth in the style. Ichang papeda and pummelo `Matou anyu' were self-incompatible, whereas two papeda accessions, five accessions classified as citron and its relatives, and two hybrids, `Hayaka' and `Haruka', were self-compatible. Of the 396 cross combinations among 26 self-incompatible accessions including 111 reciprocal crosses, `Ariake' and Clementine, Kunenbo and Yamabuki, and Keraji and Kikai-mikan were cross-incompatible. Remaining 390 cross combinations were cross-compatible