Table 3.
Comparisons of distribution frequency and representativeness among five different core collections constructed based on diverse sampling strategies
| Evaluated parameter | Data combination | Entire germplasm collection | |||||
|---|---|---|---|---|---|---|---|
| Gcc | Ggcc | Pcc | G + Pcc | Gg + Pcc | |||
| Number of entries (%) | 7 (0.2) | 53 (1.4) | 76 (2.0) | 76 (2.0) | 240 (6.3) | 3,821 | |
| Number of alleles | 96 | 96 | 264 | 360 | 360 | 360 | |
| Continuous variables | MD % | 38.28 | 18.89 | 15.85 | 15.35 | 9.45 | - |
| CR % | 13.95 | 50.89 | 96.99 | 97.04 | 98.40 | - | |
| VD % | 5757.70 | 80.02 | 49.37 | 46.55 | 32.46 | - | |
| VR % | 52.15 | 112.37 | 126.99 | 125.95 | 115.65 | - | |
| Categorical variables | I | 0.88 | 0.91 | 0.94 | 0.97 | 0.95 | 0.85 |
| I max | 1.25 | 1.25 | 1.25 | 1.25 | 1.25 | 1.25 | |
| J’ | 0.77 | 0.79 | 0.78 | 0.81 | 0.80 | 0.73 | |
Gcc: core collection constructed based on genotype with nongroup based strategy, Ggcc: core collection constructed from entries in each cluster grouped by genotype, Pcc: core collection constructed based on phenotype, G + Pcc: core collection constructed based on combination of genotype and phenotype, Gg + Pcc: core collection constructed based on genotype and phenotype combination from each cluster grouped by genotype. Distributional aspects to validate a representativeness of core collection; MD%: the mean difference percentage, CR%: the coincidence rate, VD%: the variance difference percentage, VR%: variable rate. Genetic diversity indices to validate categorical variables; I: Shannon’s information index of diversity, I max: logarithmic number of classes in entire collection, J’: genetics evenness