【摘 要】
：
A BnALS1R gene conferring resistance to the imidazolinone herbicides was previously isolated from an ALS(acetolactate synthase)inhabiting herbicide-resistant mutant line M9 in Brassica napus.A single
【机 构】
：
Institute of Industrial Crops,Jiangsu Academy of Agricultural Sciences Nanjing Sub-center,National C
【出 处】
：
第十九届国际十字花科遗传学会及芸薹属2014年年会
论文部分内容阅读
A BnALS1R gene conferring resistance to the imidazolinone herbicides was previously isolated from an ALS(acetolactate synthase)inhabiting herbicide-resistant mutant line M9 in Brassica napus.A single nucleotide polymorphism leading to an amino acid substitution from serine to asparagine at site 638 of ALS was found between the BnALS1R in the mutant and BnALS1 in the wild type.We reported here the development of polymorphic molecular marker for allele-specific PCR(AS-PCR)assays to distinguish herbicide-susceptible and resistant ALS alleles in either homozygous or heterozygous genotypes.Thirty primers were designed according to the SNP(site 638,Ser was replaced by Asn)and the difference in DNA sequence between the BnALS1 and BnALS3 cloned from M9 and other susceptible cultivars.Three primers of them with polymorphism were obtained,which can differentiate the homozygous resistant M9 from susceptible rapeseed.Meanwhile,these PCR markers can effectively discriminate among three genotypes using polymorphic primers and were evaluated in F2,BC1,and BC2 populations.Observed segregation ratios fitted the expected 1:2:1,1:1,and 1:1 ratios,respectively,which confirms the single-locus Mendel model.Furthermore,we used the markers for detecting the resistant gene and evaluating the size of DNA segments introgressed from the M9 donor in the resistant restoring lines containing BnALS1R.All the resistant restoring lines had the DNA banding pattern of BnALS1R.Therefore,PCR-based assays using the markers could be used for the detection and characterization of the herbicide-resistant gene BnALS1R in rapeseed.The validated AS-PCR markers will facilitate the breeding of herbicide-resistant rapeseed by using BnALS1R in marker-assisted selection.
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