title: Fine Mapping of Two Additive Effect Genes for Awn Development in Rice (Oryza sativa L.).
abstract: Awns, important domestication and agronomic traits in rice (Oryza sativa L.), are conferred by polygenes and the environment. Near isogenic line (NIL) pairs BM33 and BM38 were constructed from crosses between awnless japonica cv Nipponbare as recurrent parent, and lines SLG or Funingxiaohongmang (awned japonica accessions), respectively, as donors. In order to study the genetic and molecular mechanism of awning, two unknown, independent genes with additive effects were identified in a cross between the NILs. To map and clone the two genes, a BC4F4 population of 8,103 individuals and a BC4F6 population of 11,206 individuals were constructed. Awn3-1 was fine mapped to a 101.13 kb genomic region between Indel marker In316 and SNP marker S9-1 on chromosome 3. Nine predicted genes in the interval were annotated in the Rice Annotation Project Database (RAP-DB), and Os03g0418600 was identified as the most likely candidate for Awn3-1 through sequence comparisons and RT-PCR assays. Awn4-2 was fine mapped to a 62.4 kb genomic region flanked by simple sequence repeat (SSR) marker M1126 and Indel maker In73 on chromosome 4L. This region contained the previously reported gene An-1 that regulates awn development. Thus, An-1 may be the candidate gene of Awn4-2. These results will facilitate cloning of the awn genes and thereby provide an understanding of the molecular basis of awn development.
authors: Key Laboratory of Crop Heterosis and Utilization of Ministry of Education and Beijing Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing 100193, China.
authors: Ben
authors: B
authors: Li
authors: Key Laboratory of Crop Heterosis and Utilization of Ministry of Education and Beijing Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing 100193, China.
authors: Yanpei
authors: Y
authors: Zhang
authors: Key Laboratory of Crop Heterosis and Utilization of Ministry of Education and Beijing Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing 100193, China.
authors: Jinjie
authors: J
authors: Li
authors: Key Laboratory of Crop Heterosis and Utilization of Ministry of Education and Beijing Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing 100193, China.
authors: Guoxin
authors: G
authors: Yao
authors: Key Laboratory of Crop Heterosis and Utilization of Ministry of Education and Beijing Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing 100193, China.
authors: Huiqiao
authors: H
authors: Pan
authors: Key Laboratory of Crop Heterosis and Utilization of Ministry of Education and Beijing Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing 100193, China.
authors: Guanglong
authors: G
authors: Hu
authors: Key Laboratory of Crop Heterosis and Utilization of Ministry of Education and Beijing Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing 100193, China.
authors: Chao
authors: C
authors: Chen
authors: Key Laboratory of Crop Heterosis and Utilization of Ministry of Education and Beijing Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing 100193, China.
authors: Hongliang
authors: H
authors: Zhang
authors: Key Laboratory of Crop Heterosis and Utilization of Ministry of Education and Beijing Key Laboratory of Crop Genetic Improvement, China Agricultural University, Beijing 100193, China.
authors: Zichao
authors: Z
authors: Li
mesh_terms: D002874:Chromosome Mapping / Q000379:methods*; D032461:Chromosomes, Plant; D018507:Gene Expression Regulation, Developmental; D018506:Gene Expression Regulation, Plant; D012275:Oryza / Q000235:genetics* / Q000254:growth & development; D010940:Plant Proteins / Q000235:genetics*; D040641:Quantitative Trait Loci; D012639:Seeds / Q000235:genetics* / Q000254:growth & development
chemical_list: D010940:Plant Proteins