Crosses between ‘Akihime’ as seed parent and ‘UC-01’, ‘Whiteberry’,
and ‘Hawaii-30’ as pollen parents produced few achenes in
all cross-combinations (Table 2). However, when ‘UC-01’ was used
as seed parent, many achenes and normal plants were obtained
from the cross with ‘Hawaii-30’, but no achenes were produced
from crosses with ‘Akihime’. Furthermore, the cross between ‘UC-
01’ and ‘Whiteberry’, which is also a diploid but a different species,
was not successful. On the other hand, when ‘Hawaii-30’ was used
as seed parent, it showed an excellent ability to produce many
achenes from both ‘UC-01’ and ‘Akihime’, and produced normal
plants.