Mapping of a major QTL for salt tolerance of mature field-grown maize plants based on SNP markers

BMC Plant Biology

Research Article

Wei Song¹  Jinfeng Xing¹  Shasha Zhang¹  Minxiao Duan¹  Huasheng Zhang¹  Ruyang Zhang¹  Meijie Luo¹  Naishun Wang¹  Yanxin Zhao¹  Jiuran Zhao¹  Wenguang Wang¹  Jingna Li¹  Zi Shi¹  Zhihui Chen² 

[1] Beijing Key Laboratory of Maize DNA Fingerprinting and Molecular Breeding, Maize Research Center, Beijing Academy of Agriculture and Forestry Sciences (BAAFS), Beijing, China;Institute of Crops Research, Hunan Academy of Agricultural Sciences, Changsha, China;

关键词: Salt tolerance;    QTL mapping;    SNP;    Plant height;    Maize;   

DOI  :  10.1186/s12870-017-1090-7

 received in 2017-03-21, accepted in 2017-08-08,  发布年份 2017

来源: Springer

【 摘 要 】

BackgroundSalt stress significantly restricts plant growth and production. Maize is an important food and economic crop but is also a salt sensitive crop. Identification of the genetic architecture controlling salt tolerance facilitates breeders to select salt tolerant lines. However, the critical quantitative trait loci (QTLs) responsible for the salt tolerance of field-grown maize plants are still unknown.ResultsTo map the main genetic factors contributing to salt tolerance in mature maize, a double haploid population (240 individuals) and 1317 single nucleotide polymorphism (SNP) markers were employed to produce a genetic linkage map covering 1462.05 cM. Plant height of mature maize cultivated in the saline field (SPH) and plant height-based salt tolerance index (ratio of plant height between saline and control fields, PHI) were used to evaluate salt tolerance of mature maize plants. A major QTL for SPH was detected on Chromosome 1 with the LOD score of 22.4, which explained 31.2% of the phenotypic variation. In addition, the major QTL conditioning PHI was also mapped at the same position on Chromosome 1, and two candidate genes involving in ion homeostasis were identified within the confidence interval of this QTL.ConclusionsThe detection of the major QTL in adult maize plant establishes the basis for the map-based cloning of genes associated with salt tolerance and provides a potential target for marker assisted selection in developing maize varieties with salt tolerance.

【 授权许可】

CC BY   
© The Author(s). 2017