Open AccessHomoeologous exchange is a major cause of gene presence/absence variation in the amphidiploid Brassica napus
Author(s) -
Hurgobin Bhavna,
Golicz Agnieszka A.,
Bayer Philipp E.,
Chan ChonKit Kenneth,
Tirnaz Soodeh,
Dolatabadian Aria,
Schiessl Sarah V.,
Samans Birgit,
Montenegro Juan D.,
Parkin Isobel A. P.,
Pires J. Chris,
Chalhoub Boulos,
King Graham J.,
Snowdon Rod,
Batley Jacqueline,
Edwards David
Publication year - 2018
Publication title -
plant biotechnology journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.525
H-Index - 115
eISSN - 1467-7652
pISSN - 1467-7644
DOI - 10.1111/pbi.12867
Subject(s) - biology , brassica , gene , polyploid , genetics , glucosinolate , phenotype , genetic diversity , botany , ploidy , population , demography , sociology
Summary Homoeologous exchanges ( HE s) have been shown to generate novel gene combinations and phenotypes in a range of polyploid species. Gene presence/absence variation ( PAV ) is also a major contributor to genetic diversity. In this study, we show that there is an association between these two events, particularly in recent Brassica napus synthetic accessions, and that these represent a novel source of genetic diversity, which can be captured for the improvement of this important crop species. By assembling the pangenome of B. napus, we show that 38% of the genes display PAV behaviour, with some of these variable genes predicted to be involved in important agronomic traits including flowering time, disease resistance, acyl lipid metabolism and glucosinolate metabolism. This study is a first and provides a detailed characterization of the association between HE s and PAV s in B. napus at the pangenome level.