Pollens of the octoploid
plants were collected by shaking flowers and pollens were placed in the small container.
HT22, HT24, HT44, and HT47 are primary hexaploid tritordeums (2n = 6x = 42) while HT18 is an octoploid
one (2n = 8x = 56).
1] hybrids within and between the hexaploid South American and octoploid
North American groups reflect close relationships (Stebbins and Tobgy, 1944; Stebbins, 1947, 1981; Hall, 1955; Naranjo, 1992).
All of these octoploid
hybrids (western wheatgrass x amphiploid), however, exhibited meiotic abnormalities and were completely sterile.
OK-906 is an octoploid
(2n = 56) annual derived from a hexaploid wheat x Thinopyrum sp.
followed by doubling of the chromosome number to produce fertile hexaploid and octoploid
With the exception of Paspalum almum (2n=12, 24), all the species studied here have chromosome numbers which are multiples of 10, varying from diploids to octoploids
Through descending dysploidy, a second basic number x = 6 was derived, relative to which the somatic chromosome numbers 24 and 48 are tetraploids and octoploids
Intergeneric crosses have also been used for ploidy reductions, for example to reduce octoploids
to tetrahaploids in strawberry (Janick & Hughes, 1974).
Cytogenetic analyses of autopolyploids: models and methods for triploids to octoploids
All confirmed lowland ecotypes have been tetraploids and most upland ecotypes are octoploids
(Hopkins et al.
Further, if this accession produced unreduced male gametes, some of the hybrid offspring from the five apomictic accessions should have been octoploids
(2n = 8x = 72; 2n + 2n) rather than hexaploids (2n = 6x = 54; 2n + n), but all the offspring were either tetraploids (2n + 0) or hexaploids (2n + n) (Tables 2 and 3).