Identification of unconditional and conditional QTL for oil, protein and starch content in maize

Crop Journal

Xiaohong Yang¹  Tongming Song²  Yuqiu Guo³  Jun Zhang³  Jianbing Yan³  Jiansheng Li³  Subhash Chander³ 

[1] Crop Research Institute, Shandong Academy of Agricultural Sciences, Jinan, Shandong 250100, China;National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei 430070, China;National Maize Improvement Center of China, Beijing Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing 100094, China;

关键词: Zea mays;    Oil;    Protein;    Starch;    Unconditional QTL;    Conditional QTL;   

DOI  :  doi:10.1016/j.cj.2013.07.010

来源: DOAJ

【 摘 要 】

Oil, protein and starch are key chemical components of maize kernels. A population of 245 recombinant inbred lines (RILs) derived from a cross between a high-oil inbred line, By804, and a regular inbred line, B73, was used to dissect the genetic interrelationships among oil, starch and protein content at the individual QTL level by unconditional and conditional QTL mapping. Combined phenotypic data over two years with a genetic linkage map constructed using 236 markers, nine, five and eight unconditional QTL were detected for oil, protein and starch content, respectively. Some QTL for oil, protein and starch content were clustered in the same genomic regions and the direction of their effects was consistent with the sign of their correlation. In conditional QTL mapping, 37 (29/8) unconditional QTL were not detected or showed reduced effects, four QTL demonstrated similar effects under unconditional and conditional QTL mapping, and 17 additional QTL were identified by conditional QTL mapping. These results imply that there is a strong genetic relationship among oil, protein and starch content in maize kernels. The information generated in the present investigation could be helpful in marker-assisted breeding for maize varieties with desirable kernel quality traits.

【 授权许可】

Unknown