Identification of Quantitative Trait Loci for Phytic Acid Concentration in Maize Grain Under Two Nitrogen Conditions
2013
LIU Jian-chao, HUANG Ya-qun, MA Wen-qi, ZHOU Jin-feng, BIAN Fen-ru, CHEN Fan-jun , MI Guo-hua (1.Key Laboratory for Bio-Resource and Eco-Environment, Ministry of Education/State Key Laboratory of Hydraulics and Mountain River Engineering/College of Life Science, Sichuan University, Chengdu 610064, P.R.China 2.Neijiang Hybrid Rice Research and Development Center, Neijiang 641000, P.R.China 3.Department of Plant, Soil and Entomological Sciences, University of Idaho, Moscow 83844, USA 4.School of Biotechnology and Food Engineering, Hefei University of Technology, Hefei 230009, P.R.China)
Phytic acid (PA) is the main storage form of phosphorus (P) in seeds. It can form insoluble complexes with microelements, thereby reducing their bioavailability for animals. Identification of quantitative trait loci (QTLs) associated with grain PA concentration (PAC) is essential to improve this trait without affecting other aspects of grain nutrition such as protein content. Using a recombinant inbred line (RIL) population, we mapped QTL for grain PAC, as well as grain nitrogen concentration (NC) and P concentration (PC) in maize under two N conditions in 2 yr. We detected six QTLs for PAC. The QTL for PAC on chromosome 4 (phi072-umc1276) was identified under both low-N and high-N treatments, and explained 13.2 and 15.4% of the phenotypic variance, respectively. We identified three QTLs for grain NC, none of which were in the same region as the QTLs for PAC. We identified two QTLs for PC in the low-N treatment, one of which (umc1710-umc2197) was in the same interval as the QTL for PAC under high-N conditions. These results suggested that grain PAC can be improved without affecting grain NC and inorganic PC.
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