Genetic Relationships of Soybean Mutants for Different Linolenic Acid Contents
1998
Rahman, Shaikh M. | Kinoshita, Takehito | Anai, Toyoaki | Arima, Susumu | Takagi, Yutaka
The normal content (80–90 g kg⁻¹) of linolenic acid in soybean [Glycine max (L.) Merr.] oil adversely affects oil flavor and stability. A new mutant (M-24) with lower linolenic acid content (62 g kg⁻¹) was developed by x-ray irradiation. Our objective was to determine the inheritance of linolenic acid content in M-24 and to determine the genetic relationships of this trait with the fan and fanx loci known to control linolenica acid in M-5 and KL-8 mutant, respectively. Reciprocal crosses were made between each mutant and ‘Bay’, and among the three mutants No maternal or cytoplasmic effects were observed in any of the crosses. Data from F₂ seeds of the cross M-24 ✕ Bay indicated that linolenic acid content in M-24 was controlled by an allele at a single locus with no dominance effects. In the cross of M-24 ✕ KL-8, F₂ segregation indicated that linolenic acid content in M-24 and KL-8 was controlled by two different alleles at the same locus. Fort he M-5 ✕ M-24 cross, F₂ segregation patterns and the segregation of F₃ seeds from individual F₂ plants indicated that M-5 and M-24 mutants have alleles at different independent loci that control linolenic acid content. Therefore, the allele in M-24 is designated as fanxᵅ (M-24) to distinguish it from those of fan (M-5) and fanx (KL-8). The segregate with the fanfanfanxᵅ fanxᵅ genotype can be considered as an important germplatsm that can reduce the linolenic acid content in soybean oil.
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