tailieunhanh - Food Production Approaches, Challenges and Tasks Part 15

Tham khảo tài liệu 'food production approaches, challenges and tasks part 15', khoa học tự nhiên, công nghệ sinh học phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Genetic Characterization of Global Rice Germplasm for Sustainable Agriculture 255 explained the genetic diversity in the core collection. Analysis of molecular variance AMOVA showed that 38 of the variance was due to genetic differentiation among the populations Table 3 . The remaining 62 of the variance was due to the differences within the populations. The variances among and within the populations were highly significant p . Source df SS MS Est. Var. ST P-valuea Among Pops 4 57383 14346 43 38 Within Pops 1781 124086 70 70 62 Total 1785 181470 112 100 a Probability of obtaining a more extreme random value computed from non-parametric procedures 1 000 permutations . Table 3. Analysis of molecular variance AMOVA for the 1 763 core accessions and 23 reference cultivars for five populations Pops of ARO AUS IND TEJ and TRJ based on 72 DNA markers. 2 3 4 5 6 7 8 Number of populations K Fig. 6. Five populations should be structured based on both the log-likelihood values Deviance Information Criterion DIC and the change rate of log-likelihood values AK for estimated number of populations over 50 structure replicated runs using TESS program. Where relatively flat change of both DIC and AK occurs indicates the most likely number of populations. 256 Food Production - Approaches Challenges and Tasks Among 40 reference cultivars 20 that are known tropical japonica TRJ were classified in K1 four known temperate japonica TEJ in K2 eight known indica IND in K3 three known AUS AUS in K4 and five known aromatic ARO in K5 indicating the correspondent ancestry of each population. Based on the references each accession was clearly assigned to a single population when its inferred ancestry estimate was or larger and admixture between populations when its estimate was less than . Admixture was based on proportion of the estimate . GSOR 310002 was assigned TEJ-TRJ because of its estimate in K2 and in K1. K1 or TRJ population included