Exact(7)
The proportion of accessions with Ping16A has increased in domesticated rice while the original Ping (Ping16G) has been dramatically reduced.
A large proportion of accessions formed one sub-group indicated to the left, and the other sub-group (right) included accessions predominantly in the modern cultivar sub-group.
The accuracy of ecosystem attribution can thus be questioned, reinforced by the fact that this information is absent for a large proportion of accessions.
BB and ABB were the groups with the largest proportion of accessions displaying a single allele (60.7% and 41.9%, respectively), followed by wild (41.3%) and cultivated AA diploids (39.7%).
Within each ploidy level, the BB genome group presented a higher proportion of accessions with only one allele (homozygosis) as previously reported [ 7], suggesting a lower genetic variability [ 72] or the occurrence of a large number of null alleles among the accessions evaluated.
Populations 6 and 9, which contained a high proportion of accessions with the facultative growth habit, also show some similarities when other phenotypes are considered, being largely six-row (87% for population 6, 94% for population 9), hulled (100, 99%) and daylength responsive (67, 91%).
The Ward clustering analysis revealed a major division between the subpopulations enriched in accessions from Asia (4A, 4B, and 4C, henceforth "Asian" subpopulations) and subpopulations that include a large proportion of accessions from other parts of the world (1A, 1B, 2, and 3, henceforth "Western" subpopulations).
Similar(1)
It is important to point out that the proportions of subgroups presented in Figure 1 and in the clusters in Figure 2, represent the proportions of accessions in the NSGC spring wheat core collection, but may not necessarily represent the current composition of cultivars in a specific country or group.
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