Document Detail

New insights into the genetics of in vivo induction of maternal haploids, the backbone of doubled haploid technology in maize.
MedLine Citation:
PMID:  22135357     Owner:  NLM     Status:  MEDLINE    
Haploids and doubled haploid (DH) inbred lines have become an invaluable tool for maize genetic research and hybrid breeding, but the genetic basis of in vivo induction of maternal haploids is still unknown. This is the first study reporting comparative quantitative trait locus (QTL) analyses of this trait in maize. We determined haploid induction rates (HIR) in testcrosses of a total of 1061 progenies of four segregating populations involving two temperate haploid inducers, UH400 (HIR = 8%) and CAUHOI (HIR = 2%), one temperate and two tropical inbreds with HIR = 0%, and up to three generations per population. Mean HIR of the populations ranged from 0.6 to 5.2% and strongly deviated from the midparent values. One QTL (qhir1) explaining up to p = 66% of the genetic variance was detected in bin 1.04 in the three populations involving a noninducer parent and the HIR-enhancing allele was contributed by UH400. Segregation ratios of loci in bin 1.04 were highly distorted against the UH400 allele in these three populations, suggesting that transmission failure of the inducer gamete and haploid induction ability are related phenomena. In the CAUHOI × UH400 population, seven QTL were identified on five chromosomes, with qhir8 on chromosome 9 having p > 20% in three generations of this cross. The large-effect QTL qhir1 and qhir8 will likely become fixed quickly during inducer development due to strong selection pressure applied for high HIR. Hence, marker-based pyramiding of small-effect and/or modifier QTL influencing qhir1 and qhir8 may help to further increase HIR in maize. We propose a conceptual genetic framework for inheritance of haploid induction ability, which is also applicable to other dichotomous traits requiring progeny testing, and discuss the implications of our results for haploid inducer development.
Vanessa Prigge; Xiaowei Xu; Liang Li; Raman Babu; Shaojiang Chen; Gary N Atlin; Albrecht E Melchinger
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-11-30
Journal Detail:
Title:  Genetics     Volume:  190     ISSN:  1943-2631     ISO Abbreviation:  Genetics     Publication Date:  2012 Feb 
Date Detail:
Created Date:  2012-02-20     Completed Date:  2012-06-18     Revised Date:  2013-06-27    
Medline Journal Info:
Nlm Unique ID:  0374636     Medline TA:  Genetics     Country:  United States    
Other Details:
Languages:  eng     Pagination:  781-93     Citation Subset:  IM    
Institute of Plant Breeding, Seed Science, and Population Genetics, University of Hohenheim, 70593 Stuttgart, Germany.
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MeSH Terms
Chromosome Mapping
Chromosomes, Plant
Genetic Linkage
Quantitative Trait Loci
Zea mays / genetics*

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