Selection of seed parents
As mentioned above, the sour orange ? Rangpur somatic
hybrid produces very high yield efficiency per canopy
volume when used as a rootstock. However, this hybrid
produces seed containing embryos of zygotic origin, and is
therefore not amenable to standard nursery propagation. On
this basis, it was selected as a first seed parent for breeding
at the tetraploid level. The choice of the second seed parent
was based on serendipity. The somatic hybrid, ‘Nova’