Understanding the Genetic Basis of Flowering and Fertility in the Ryegrasses (Lolium spp.)

Armstead, Ian; Yang, Bicheng; Barth, Susanne; Turner, Lesley B.; Skøt, Leif; Marshall, A. H.; Humphreys, Mervyn O.; King, I. P.; Thorogood, Daniel

doi:10.1007/978-0-387-79144-9_17

Molecular Breeding of Forage and Turf 2009

DOI: 10.1007/978-0-387-79144-9_17

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Understanding the Genetic Basis of Flowering and Fertility in the Ryegrasses (Lolium spp.)

Ian Armstead¹,

Bicheng Yang²,

Susanne Barth³

et al.

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Cited by 2 publications

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“…The identification of candidate genes in species such as perennial ryegrass, for which there are limited molecular biological tools, can be problematic, but comparative genetic approaches have indicated that key genes from established flowering induction pathways may be involved Jensen et al, 2005;Skøt et al, 2007). One such QTL is located on a region of chromosome 7 (C7) that is syntenic with the region of rice C6, which is associated with the Heading date3 (Hd3) QTL Armstead et al, 2004Armstead et al, , 2009). This QTL is determined by variation at the underlying Hd3a/OsFTL2 gene, an ortholog of Arabidopsis (Arabidopsis thaliana) FLOW-ERING LOCUS T (AtFT; Kojima et al, 2002) and of perennial ryegrass FT3 (LpFT3).…”

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Allelic Variation in the Perennial Ryegrass FLOWERING LOCUS T Gene Is Associated with Changes in Flowering Time across a Range of Populations

et al. 2010

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The Arabidopsis (Arabidopsis thaliana) FLOWERING LOCUS T (FT) gene and its orthologs in other plant species (e.g. rice [Oryza sativa] OsFTL2/Hd3a) have an established role in the photoperiodic induction of flowering response. The genomic and phenotypic variations associated with the perennial ryegrass (Lolium perenne) ortholog of FT, designated LpFT3, was assessed in a diverse collection of nine European germplasm populations, which together constituted an association panel of 864 plants. Sequencing and genotyping of a series of amplicons derived from the nine populations, containing the complete exon and intron sequences as well as 5' and 3' noncoding sequences of LpFT3, identified a total of seven haplotypes. Genotyping assays designed to detect the genomic variation showed that three haplotypes were present in approximately equal proportions and represented 84% of the total, with a fourth representing a further 11%. Of the three major haplotypes, two were predicted to code for identical protein products and the third contained two amino acid substitutions. Association analysis using either a mixed model with a relationship matrix to correct for population structure and relatedness or structured association with further correction using genomic control indicated significant associations between LpFT3 and variation in flowering time. These associations were corroborated in a validation population segregating for the same major alleles. The most "diagnostic" region of genomic variation was situated 5' of the coding sequence. Analysis of this region identified that the interhaplotype variation was closely associated with sequence motifs that were apparently conserved in the 5' region of orthologs of LpFT3 from other plant species. These may represent cis-regulatory elements involved in influencing the expression of this gene.

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Allelic Variation in the Perennial Ryegrass FLOWERING LOCUS T Gene Is Associated with Changes in Flowering Time across a Range of Populations

et al. 2010

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Tightly clustered markers linked to an apospory‐related gene region and quantitative trait loci mapping for agronomic traits in Brachiaria hybrids

et al. 2016

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Brachiariagrass is an important tropical forage grass cultivated around the world. Despite its global importance, the development of brachiariagrass breeding programs was delayed by the complications of recombining aposporous apomictic genotypes until the late 1980s. 'Mulato' is the first apomictic hybrid cultivar of brachiariagrass with the development of synthetic sexual tetraploid lines. An amplified fragment-length polymorphism (AFLP) linkage map of the apomictic pollen donor 'Mulato' was developed to identify molecular markers for apospory. The map contained 29 linkage groups with 272 markers. Twelve tightly clustered AFLP markers related to apospory were identified in linkage group 2. Furthermore, we identified quantitative trait loci (QTLs) for leaf width, leaf shape ratio (width/length), stem diameter and percentage of filled seeds using simple interval mapping and composite interval mapping. The AFLP markers tightly linked to apospory and QTLs associated with important agronomical traits will be valuable tools for marker-assisted selection in brachiariagrass improvement programs.

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Understanding the Genetic Basis of Flowering and Fertility in the Ryegrasses (Lolium spp.)

Cited by 2 publications

References 14 publications

Allelic Variation in the Perennial Ryegrass FLOWERING LOCUS T Gene Is Associated with Changes in Flowering Time across a Range of Populations

Allelic Variation in the Perennial Ryegrass FLOWERING LOCUS T Gene Is Associated with Changes in Flowering Time across a Range of Populations

Tightly clustered markers linked to an apospory‐related gene region and quantitative trait loci mapping for agronomic traits in Brachiaria hybrids

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