1.College of Agriculture, Jilin Agricultural University, Changchun 130118, China
2.Soybean Research Institute/Key Laboratory of Hybrid Soybean Breeding of Ministry of Agriculture and Rural Affairs, Jilin Academy of Agricultural Sciences, Changchun 130033, China
3.General Station of Seed Management, Jilin Province, Changchun 130031, China
In order to clarify the genetic distance and relatedness of soybean varieties/lines in Jilin Province from 2003 to 2022, 299 soybean varieties/lines from 2003 to 2022 were selected as test materials and analyzed for genetic diversity and population structure using SNP markers covering the soybean genome. The results showed that: 1) A total of 3 240 SNP markers detected a total of 16 genotypes including A/A, A/G and A/T in the participating materials. The molecular marker polymorphic information content (PIC) was ranged from 0.009 9 to 0.556 1 with an average value of 0.318 4. The results obtained by using software of Powermarker vision 3.25 showed that the allele frequency of the sample population was 0.688 3 and the average PIC value was 0.3185. 2) The genetic similarity coefficient among the participating materials was ranged from 44.86% to 95.46% with an average value of 63.40%; Among them, the materials with genetic similarity coefficients ranging from 60% to 70% contained the most materials. The number of samples was 170, which accounted for 56.86% of the participating materials. 3) According to the genetic distances, the tested materials were classified into 4 populations, population Ⅰ, Ⅱ, Ⅲ and Ⅳ contained 8, 3, 115, 173 varieties/lines, respectively. The varieties/lines originating from the same breeding unit were generally classified into 1 population. 4) The genetic structure prediction was further carried out by using STRUCTURE, and the results was K=4, which indicated that the 299 varieties/lines of the participating materials could be classified into 4 groups of independent genetic population. The 1st, 2nd, 3rd, and 4th genetic population contained 24, 18, 105, 152 varieties/lines, respectively. The 1st genetic population contains the most ancestral genetic material, while the 2nd, 3rd and 4th genetic population gradually increased the proportion of the introduced genetic material and the 4th genetic population introduced genetic material accounted for 46.8%. In conclusion, the total genetic background of the tested soybean variety populations was relatively narrow. However, the genetic diversity of the 4th genetic population (152 copies/lines) was significantly higher than the overall level due to the use of introduced genetic material.
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