Inheritance of male fertility restoration of the cytoplasmic-nuclear male-sterile line NJCMS1A of soybean [Glycine max (L) Merr.] |
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Authors: | Y N Bai J Y Gai |
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Institution: | (1) National Center for Soybean Improvement, and National Key Laboratory of Crop Genetics and Germplasm Enhancement, Soybean Research Institute of Nanjing Agricultural University, Nanjing, Jiangsu, 210095, P.R. China |
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Abstract: | At present, no report on inheritance of male fertility restoration has been released, yet more than 10 cytoplasmic-nuclear
male-sterile soybean lines as well as their maintainers and restorers have been developed. Based on our previous work, 25
restorers for the male-sterile line NJCMS1A were identified and the inheritance of male fertility restoration for these restorers
was studied. The results showed that F1s between NJCMS1A and its restorers were completely male-fertile. The numbers of fertile and sterile plants in the F2 population of Cross I (NJCMS1A × N23601) and Cross II (NJCMS1A × N23683) corresponded to a segregation ratio of 15:1, and
the numbers of non-segregation lines, 3:1 segregation lines and 15:1 segregation lines in F2:3 of the same two crosses fitted a 7:4:4 genotypic segregation ratio. The testcross BC1F1s between the F1s of the above two crosses and NJCMS1A, NJCMS1B showed a 3:1 segregation ratio. Accordingly, it was inferred that two pairs
of duplicate dominant genes controlled the male fertility restoration of NJCMS1A in both crosses. Meanwhile, F2 of other 23 crosses between NJCMS1A and its 23 restorers showed a fertility segregation ratio of 3:1 or 15:1. The F1s of the five testcrosses between NJCMS1A and the F1s of five crosses selected from the above 23 crosses showed that fertility segregation was 3:1 in BC1F1s between NJCMS1A and F1s of the crosses of which fertility segregation fitted 15:1 in F2 population, while fertility segregation in BC1F1s was 1:1 for those fertility segregation fitted 3:1 in F2 population. Allelism tests showed that restore genes of all restorers in the experiment were allelic to two pairs of dominant
genes. All results showed that some restorers bore one pair of dominant restore gene and the others bore two pairs of duplicate
dominant gene. The mechanism of F1 male sterility of the cross N8855 × N2899 was discussed. |
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Keywords: | cytoplasmic-nuclear male sterility inheritance male fertility restoration soybean [Glycine max (L ) Merr ] |
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