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''Based on submission by Monika Frey to the MaizeGDB and the Maize Genetics Cooperation Newsletter.'' Function Maize gene for first step in biosynthesis of benzoxazin, which aids in resistance to insect pests, pathogenic fungi and bacteria. First report Hamilton 1964, as a mutant sensitive to the herbicide atrazine, and lacking benzoxazinoids (less than 1% of non-mutant plants). Mutations in the bx1 gene reduce the resistance to first generation European corn borer that is conferred by benzoxazinoids. Molecular characterization reveals that the BX1 protein is a homologue to the alpha-subunit of tryptophan synthase. The reference mutant allele has a deletion of about 900 bp, located at the 5'-terminus and comprising sequence upstream of the transcription start site and the first exon. A second mutant allele is given by a ''Mu'' transposon insertion in the fourth exon (Frey et al. 1997 ). Gene sequence diversity analysis has been performed for 281 inbred lines of maize, and the results suggest that bx1 is responsible for much of the natural variation in DIMBOA (a benzoxazinoid compound) synthesis (Butron et al. 2010). == Map location == AB chromosome translocation analyses place on short arm of chromosome 4 (4S; Simcox and Weber 1985 ). There is close linkage to other genes in the benzoxazinoid synthesis pathway [''bx2, bx3, bx4, bx5'' Frey et al. 1995, 1997〔 ). Gene ''bx1'' is 2490 bp from ''bx2'' (Frey et al. 1997〔 ); between ''umc123'' and ''agrc94'' on 4S (Melanson et al. 1997 ). Mapping probes: SSR p-umc1022 (Sharopova et al. 2002 ); Overgo (physical map probe) PCO06449 (Gardiner et al. 2004 ). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bx1 benzoxazin1」の詳細全文を読む スポンサード リンク
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