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- Title
Construction of intraspecific linkage maps, detection of a chromosome inversion, and mapping of QTL for constitutive root aerenchyma formation in the teosinte Zea nicaraguensis.
- Authors
Mano, Yoshiro; Omori, Fumie; Takeda, Kazuyoshi
- Abstract
The teosinte Zea nicaraguensis, a wild relative of maize, possesses a flooding tolerance-related trait: the formation of constitutive root aerenchyma under drained (non-flooded) soil conditions. A previous study suggested that the degree of constitutive aerenchyma formation varies within Z. nicaraguensis. The objectives of this study were to construct linkage maps, to determine the marker order in a region of chromosome 4 in which recombination between maize and Z. nicaraguensis is suppressed, and to identify quantitative trait loci (QTL) controlling constitutive root aerenchyma formation in two segregating populations of Z. nicaraguensis. A total of 236 simple sequence repeat (SSR) markers were screened for polymorphism in an S1 population of Z. nicaraguensis. Seventy-one polymorphic SSR markers were assigned to 10 chromosomes, and a linkage map was constructed covering 793.5 cM. In the S1 map, a paracentric inversion was detected on the long arm of chromosome 4; this rearrangement was confirmed in an S1 linkage map of a different Z. nicaraguensis accession. Composite interval mapping analysis in 96 S1 plants revealed QTL for aerenchyma formation on chromosomes 1 (bins 1.06-1.07) and 7 (bin 7.01), explaining 17 and 12% of the total phenotypic variance, respectively. The QTL on chromosome 1 was verified by using 156 S2 plants. Near-isogenic lines exhibiting the presence or absence of the aerenchyma QTL have been developed that should be useful for genetic and physiological analyses of root aerenchyma formation.
- Subjects
GENE mapping; CHROMOSOMES; AERENCHYMA; ZEA; CHROMOSOME inversions; CORN; GENETIC markers; GENETIC polymorphisms
- Publication
Molecular Breeding, 2012, Vol 29, Issue 1, p137
- ISSN
1380-3743
- Publication type
Article
- DOI
10.1007/s11032-010-9532-z