Generation and characterization of low phytic acid germplasm in rice (Oryza sativa L.)

文献类型： 外文期刊

第一作者： Liu, Qing-Long

作者： Liu, Qing-Long;Xu, Xiu-Hong;Ren, Xue-Liang;Fu, Hao-Wei;Wu, Dian-Xing;Shu, Qing-Yao

作者机构：

关键词： Oryza sativa L.;low phytic acid (lpa);mutation;gene mapping;Myo-inositol kinase;NON-MENDELIAN INHERITANCE;LOW-PHYTATE CORN;SOYBEAN LINES;PHOSPHORUS;MAIZE;PERFORMANCE;MUTATION;SEEDS;IDENTIFICATION;ARABIDOPSIS

期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：5.699； 五年影响因子：5.565 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： Phytic acid (PA, myo-inositol 1,2,3,4,5,6-hexakisphosphate), or its salt form, phytate, is commonly regarded as the major anti-nutritional component in cereal and legume grains. Breeding of low phytic acid (lpa) crops has recently been considered as a potential way to increase nutritional quality of crop products. In this study, eight independent lpa rice mutant lines from both indica and japonica subspecies were developed through physical and chemical mutagenesis. Among them, five are non-lethal while the other three are homozygous lethal. None of the lethal lines could produce homozygous lpa plants through seed germination and growth under field conditions, but two of them could be rescued through in vitro culture of mature embryos. The non-lethal lpa mutants had lower PA content ranging from 34 to 64% that of their corresponding parent and four of them had an unchanged total P level. All the lpa mutations were inherited in a single recessive gene model and at least four lpa mutations were identified mutually non-allelic, while the other two remain to be verified. One mutation was mapped on chromosome 2 between microsatellite locus RM3542 and RM482, falling in the same region as the previously mapped lpa1-1 locus did; another lpa mutation was mapped on chromosome 3, tightly linked to RM3199 with a genetic distance of 1.198 cM. The latter mutation was very likely to have happened to the LOC_Os03g52760, a homolog of the maize myo-inositol kinase (EC 2.7.1.64) gene. The present work greatly expands the number of loci that could influence the biosynthesis of PA in rice, making rice an excellent model system for research in this area.

分类号： Q3

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