关键词:糯玉米; opaque2基因; waxy基因; 近等基因系; 赖氨酸 Construction of Waxy Maize opaque2 Near-isogenic Lines ZHANG Xiao-Xing1, ZHU Hui1, ZHANG Dong-Min1, SONG Li-Ya2, ZHANG De-Gui1, WENG Jian-Feng1, HAO Zhuan-Fang1, LI Ming-Shun1,* 1Institute of Crop Science, Chinese Academy of Agricultural Sciences / Key Laboratory of Crop Genetics and Breeding, Ministry of Agriculture, Beijing 100081, China
2Beijing Technology and Business University / Beijing Key Laboratory of Plant Resources Research and Development, Beijing 100048, China
Fund:This study was supported by the National Natural Science Foundation of China (31401390) and the China Agriculture Research System (CAR02-01) AbstractIn waxy maize, the opaque2 gene can increase the content of essential amino acids, such as lysine and tryptophan. Two high quality protein maize (QPM) inbred lines, CA339 and Lu 2548, were used as opaque2 gene donors. Twenty-five waxy maize with advantageous traits were used as receptors. Application of backcrossing and SSR marker-assisted selection in breeding can create waxy maize opaque2 near-isogenic lines. The results of molecular marker indicated that there were polymorphisms in different receptors and between the two donors. Lysine content of five sets of successfully created opaque2 near-isogenic lines was tested, showing that the content of lysine in o2w-NILs was 59.0%, 52.7%, 48.5%, 46.3%, and 61.9% higher than that in their recurrent parents, which was increased from 0.308%, 0.313%, 0.309%, 0.341%, 0.323% to 0.489%, 0.478%, 0.458%, 0.498%, and 0.522%, respectively. Using this method, opaque2 could be introgressed into multiple receptors with different genetic backgrounds to select near-isogenic lines with high lysine content and transparent phenotype, so as to improve nutritional and economic values of waxy maize.
Keyword:Waxy maize; Opaque2 gene; Waxy gene; Near-isogenic lines; Lysine Show Figures Show Figures
图2 引物phi057检测供体和受体亲本间的遗传多态性 C: CA339; D: 鲁2548; M: DNA marker; 1~25: 25个糯玉米自交系。Fig. 2 Polymorphism analysis of SSR primer phi057 between donors and receptors C: CA339; D: Lu 2548; M: DNA marker; 1-25: 25 waxy maize inbred lines.
图5 引物phi057检测BC5F3世代基因型 C: CA339; R: 轮回亲本; 1~34: BC5F3世代不同单株; M: DNA marker。Fig. 5 Genotype identification of waxy maize in BC5F3family with primer phi057 C: CA339; R: Recurrent parent; 1-34: Different individuals from BC5F3family; M: DNA marker.
图6 引物phi027检测BC5F3世代基因型 1~26: BC5F3世代不同单株; C: CA339; R: 轮回亲本。Fig. 6 Genotype identification of waxy maize in BC5F3family with primer phi027 1-26: Different individuals from BC5F3family; C: CA339; R: Recurrent parent.
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