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Inheritance of some qualitative characters in f 2 generation of a species cross between soybeans glycine max and wild soybeans glycine soja



Inheritance of some qualitative characters in f 2 generation of a species cross between soybeans glycine max and wild soybeans glycine soja



Journal of the Faculty of Agriculture Iwate University 15(1): 1-10



Seven crosses were made between soybeans (G. max) and wild soybeans (G. soja), as female and male, respectively. Pollen sterility percentage in F1 plants was investigated, and 2 selected F2 populations were developed to study the inheritance of some qualitative characters in connection with the influence of F1 partial pollen sterility to Mendelian segregation ratios. Pollen sterility percentage depended on parentage. The maximum value was 47.9% in Iwate 1 (G. max) .times. PI 81.cntdot.762 (G. soja), and the minimum was 1.2% in Larade (G. max) .times. G.S. Morioka (G. soja). Specific percentage was obtained in each of the cross combinations tested. Two F2 populations were developed from Cha-mame (G. max) .times. PI 81.cntdot.762 with 38.5% pollen sterility and Hakuho (G. max) .times. B 3-2-2 (G. soja) with 9.3%. Flower color segregation was observed in the former combination, and segregation of pubescence color, matured pod color, bloom on seed coat and electrophoretic polymorphism of Kunitz trypsin inhibitor (KTI) were recorded in the latter. The segregation ratios for all the characters except KTI polymorphism were statistically in good agreement with expected ratios from simple Mendelian inheritance. Inheritance of KTI polymorphism also agreed well with single allelic inheritance, showing a 1:2:1 ratio in F2 seed population of the same cross harvested from an F1 plant. Independency test on the F2 segregation of pubescence color, matured pod color, bloom on seed coat and KTI polymorphism was performed in all possible combinations. No evidence of linkage was detected. F1 pollen sterility has no influence on the F2 segregation of the characters tested. Apparently no genomic disharmony worked as a cause of F1 partial pollen sterility. Paracentric inversions between homologous chromosomes of the 2 spp. could be a main cause of the F1 pollen sterility.

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