Single nucleotide mutation leading to an amino acid substitution in the variant <Emphasis Type="Italic">Tik</Emphasis> soybean Kunitz trypsin inhibitor (SKTI) identified in Chinese wild soybean (<Emphasis Type="Italic">Glycine soja</Emphasis> Sieb. &; Zucc.) |
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Authors: | Ke-Jing Wang Xiang-Hua Li Tetsuro Yamashita Yoshihito Takahata |
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Institution: | (1) The National Key Facility for Crop Gene Resources and Genetic Improvement (NFCRI), Institute of Crop Science, The Chinese Academy of Agricultural Sciences, Beijing, 100081, People’s Republic of China;(2) Faculty of Agriculture, Iwate University, Morioka 020-8550, Japan |
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Abstract: | The wild soybean (Glycine soja), which is the progenitor of cultivated soybean (Glycine max), is expected to offer more information about genetic variability and more useful mutants for evolutionary research and breeding
applications. Here, a total of 1,600 wild soybean samples from China were investigated for genetic variation with regard to
the soybean Kunitz trypsin inhibitor (SKTI). A new mutant SKTI, Tik, was identified. It was found to be a Tia-derived codominant allele caused by a transversion point mutation from C to G at nucleotide +171, leading to an alteration
of one codon (AAC → AAG) and a corresponding amino acid substitution (Asn → Lys) at the ninth residue. Upon examination of
this variant and others previously found in wild soybeans, it became clear that SKTI has undergone high-level evolutionary
differentiation. There were more abundant polymorphisms in the wild than in the cultivated soybean. |
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