Genomic analyses of primitive, wild and cultivated citrus provide insights into asexual reproduction.
Document Type
Article
Publication Date
5-2017
JAX Source
Nat Genet 2017 May; 49(5):765-772
Volume
49
Issue
5
First Page
765
Last Page
772
ISSN
1546-1718
PMID
28394353
Abstract
The emergence of apomixis-the transition from sexual to asexual reproduction-is a prominent feature of modern citrus. Here we de novo sequenced and comprehensively studied the genomes of four representative citrus species. Additionally, we sequenced 100 accessions of primitive, wild and cultivated citrus. Comparative population analysis suggested that genomic regions harboring energy- and reproduction-associated genes are probably under selection in cultivated citrus. We also narrowed the genetic locus responsible for citrus polyembryony, a form of apomixis, to an 80-kb region containing 11 candidate genes. One of these, CitRWP, is expressed at higher levels in ovules of polyembryonic cultivars. We found a miniature inverted-repeat transposable element insertion in the promoter region of CitRWP that cosegregated with polyembryony. This study provides new insights into citrus apomixis and constitutes a promising resource for the mining of agriculturally important genes. Nat Genet 2017 May; 49(5):765-772.
Recommended Citation
Wang X,
Xu Y,
Zhang S,
Cao L,
Huang Y,
Cheng J,
Wu G,
Tian S,
Chen C,
Liu Y,
Yu H,
Yang X,
Lan H,
Wang N,
Wang L,
Xu J,
Jiang X,
Xie Z,
Tan M,
Larkin R,
Chen L,
Ma B,
Ruan Y,
Deng X,
Xu Q.
Genomic analyses of primitive, wild and cultivated citrus provide insights into asexual reproduction. Nat Genet 2017 May; 49(5):765-772