Intraspecific variation of residual heterozygosity and its utility for quantitative genetic studies in maize.

Abstract:

BACKGROUND:Residual heterozygosity (RH) in advanced inbred lines of plants benefits quantitative trait locus (QTL) mapping studies. However, knowledge of factors affecting the genome-wide distribution of RH remains limited. RESULTS:A set of 2196 heterogeneous inbred family (HIF) maize lines derived from 12 recombinant inbred line (RIL) populations was genotyped using the Maize50K SNP chip. A total of 18,615 unique RH intervals were identified, ranging from 505 to 2095 intervals per population, with average maize genome coverage of 94.8%. Across all populations, there were 8.6 RH intervals per HIF line on average, ranging from 1.8 to 14 intervals; the average size of an RH interval was approximately 58.7 Mb, ranging from 7.2 to 74.1 Mb. A given RH region was present in an average of 5 different individuals within a population. Seven RH hotspots, where RH segments were enriched in the genome, were found to be subject to selection during population development. The RH patterns varied significantly across populations, presumably reflecting differences in the genetic background of each population, and 8 QTLs were found to affect heterozygosity levels in the RH hotspots. The potential use of this HIF library for the fine mapping of QTLs was assessed based on publicly available QTL information, achieving a ≤ 1 Mb resolution on average. CONCLUSION:The examined library of HIF lines offers insight into the RH landscape and its intraspecific variation and provides a useful resource for the QTL cloning of important agronomic traits in maize.

journal_name

BMC Plant Biol

journal_title

BMC plant biology

authors

Liu N,Liu J,Li W,Pan Q,Liu J,Yang X,Yan J,Xiao Y

doi

10.1186/s12870-018-1287-4

subject

Has Abstract

pub_date

2018-04-19 00:00:00

pages

66

issue

1

issn

1471-2229

pii

10.1186/s12870-018-1287-4

journal_volume

18

pub_type

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