| 1 | Wide hybridization is a most widely used technique in crop breeding programs. | |
| 2 | The distant hybridization of inter-genera and inter-genera is still the main way of breeding. | |
| 3 | This technique realized the transference of inheritable matter between varieties of distant geography, and made the inheritable types abundant. | |
| 4 | All the Pomoideae were allopolyploids drived from a doubled hybrid between two remote ancestral types. | |
| 5 | A fairing arrangement according to claim 1, wherein the distal edge of said flexible sheet element includes a bulbous lip or bead. |