Synteny between a major heading-date QTL in perennial ryegrass (Lolium perenne L.) and the Hd3 heading-date locus in rice

Armstead, Ian; Turner, Lesley B.; Farrell, Markku S.; Skøt, Leif; Gómez, Pedro Sánchez; Montoya, Teresa; Donnison, Iain S.; King, I. P.; Humphreys, Mervyn O.

doi:10.1007/s00122-003-1495-6

Cited by 101 publications

(122 citation statements)

References 38 publications

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“…The map used in this study was developed further from the framework map for this F 2 family published by Armstead et al (2002) and extended by Armstead et al (2004), and had a genome coverage of 672 cM. Additional markers are simple sequence repeats (SSRs) mainly prefixed rv but also 17ca1, 25ca1, 83ca1, 08ga1, 14ga1, 22taga1, 55taga1 and 59taga1.…”

Section: Methodsmentioning

confidence: 99%

Identification and mode of action of self-compatibility loci in Lolium perenne L.

et al. 2004

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The two-locus gametophytic incompatibility system in perennial ryegrass (Lolium perenne L.) is not always fully effective: obligate selfing of plants sieves self-compatible pollen mutants, and self-fertility becomes fixed in subsequent generations. Self-compatibility (SC) was investigated in an F 2 family. In vitro self-pollinations were analysed and recorded and plants were classified as being either partially or fully compatible. Distorted segregation ratios of markers on linkage group (LG) 5 were found, which indicate the possible presence of a gametophytic SC locus. Interval linkage analysis of pollen compatibility after selfing confirmed that this distortion was due to a locus (T) analogous to the S5 locus of rye. However, even though markers in this region were, on average, less than 1 cM apart, the minimum number of plants possessing the unfavoured allele was never less than 6% for any marker locus. We proved that this was because of the presence of another SC locus, exhibiting gametophytic selection, segregating in this population and identified by interval mapping analysis of compatibility classes of in vitro self-pollinations. This locus was located on LG1, and probably corresponds to the S locus. We show that the T locus, a relic of a multilocus system, functions through interaction with the S locus: F 2 segregation of incompatibility phenotypes and linked markers demonstrated that the S/t pollen genotype combination, expected to be compatible on selfing, was sometimes incompatible. Further evidence is presented to show that this interaction must be dependent on yet another locus located on LG2. A prime candidate would be the Z incompatibility locus.

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Section: Methodsmentioning

confidence: 99%

Identification and mode of action of self-compatibility loci in Lolium perenne L.

et al. 2004

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“…Armstead et al (2004) report on synteny between a major heading-date QTL in perennial ryegrass and the Hd3 heading-date locus in rice. In addition, we made a comparison between R genes identified and mapped in other monocots.…”

Section: Synteny At the Marker And Qtl Levelmentioning

confidence: 99%

Four QTLs determine crown rust (Puccinia coronata f. sp. lolii) resistance in a perennial ryegrass (Lolium perenne) population

Muylle¹,

Baert²,

Bockstaele

et al. 2005

Heredity

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Crown rust resistance is an important selection criterion in ryegrass breeding. The disease, caused by the biotrophic fungus Puccinia coronata, causes yield losses and reduced quality. In this study, we used linkage mapping and QTL analysis to unravel the genomic organization of crown rust resistance in a Lolium perenne population. The progeny of a pair cross between a susceptible and a resistant plant were analysed for crown rust resistance. A linkage map, consisting of 227 loci (AFLP, SSR, RFLP and STS) and spanning 744 cM, was generated using the two-way pseudo-testcross approach from 252 individuals. QTL analysis revealed four genomic regions involved in crown rust resistance. Two QTLs were located on LG1 (LpPc4 and LpPc2) and two on LG2 (LpPc3 and LpPc1). They explain 12.5, 24.9, 5.5 and 2.6% of phenotypic variance, respectively. An STS marker, showing homology to R genes, maps in the proximity of LpPc2. Further research is, however, necessary to check the presence of functional R genes in this region. Synteny at the QTL level between homologous groups of chromosomes within the Gramineae was observed.LG1 and LG2 show homology with group A and B chromosomes of oat on which crown rust-resistance genes have been identified, and with the group 1 chromosomes of the Triticeae, on which leaf rustresistance genes have been mapped. These results are of major importance for understanding the molecular background of crown rust resistance in ryegrasses. The identified markers linked to crown rust resistance have the potential for use in marker-assisted breeding. Heredity (2005) 95, 348-357.

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“…The tomato FT homolog SINGLE FLOWER TRUSS also regulates flowering time and shoot architecture by generating a graft-transmissible signal . In rice and perennial ryegrass (Lolium perenne), heading date quantitative trait loci (QTL) are associated with FT homologs Monna et al, 2002;Armstead et al, 2004). In wheat (Triticum aestivum) and barley (Hordeum vulgare) the VERNALIZATION LOCUS3 (VRN3) gene corresponds to an FT function (Yan et al, 2006;Faure et al, 2007).…”

mentioning

confidence: 99%

A Genomic and Expression Compendium of the ExpandedPEBPGene Family from Maize

et al. 2007

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The phosphatidylethanolamine-binding proteins (PEBPs) represent an ancient protein family found across the biosphere. In animals they are known to act as kinase and serine protease inhibitors controlling cell growth and differentiation. In plants the most extensively studied PEBP genes, the Arabidopsis (Arabidopsis thaliana) FLOWERING LOCUS T (FT) and TERMINAL FLOWER1 (TFL1) genes, function, respectively, as a promoter and a repressor of the floral transition. Twenty-five maize (Zea mays) genes that encode PEBP-like proteins, likely the entire gene family, were identified and named Zea mays CENTRORADIALIS (ZCN), after the first described plant PEBP gene from Antirrhinum. The maize family is expanded relative to eudicots (typically six to eight genes) and rice (Oryza sativa; 19 genes). Genomic structures, map locations, and syntenous relationships with rice were determined for 24 of the maize ZCN genes. Phylogenetic analysis assigned the maize ZCN proteins to three major subfamilies: TFL1-like (six members), MOTHER OF FT AND TFL1-like (three), and . Expression analysis demonstrated transcription for at least 21 ZCN genes, many with developmentally specific patterns and some having alternatively spliced transcripts. Expression patterns and protein structural analysis identified maize candidates likely having conserved gene function of TFL1. Expression patterns and interaction of the ZCN8 protein with the floral activator DLF1 in the yeast (Saccharomyces cerevisiae) two-hybrid assay strongly supports that ZCN8 plays an orthologous FT function in maize. The expression of other ZCN genes in roots, kernels, and flowers implies their involvement in diverse developmental processes.

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Synteny between a major heading-date QTL in perennial ryegrass (Lolium perenne L.) and the Hd3 heading-date locus in rice

Cited by 101 publications

References 38 publications

Identification and mode of action of self-compatibility loci in Lolium perenne L.

Identification and mode of action of self-compatibility loci in Lolium perenne L.

Four QTLs determine crown rust (Puccinia coronata f. sp. lolii) resistance in a perennial ryegrass (Lolium perenne) population

A Genomic and Expression Compendium of the ExpandedPEBPGene Family from Maize

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