44 research outputs found
Control of flowering time and spike development in cereals: the earliness per se Eps-1 region in wheat, rice, and Brachypodium
The earliness per se gene Eps-Am1 from diploid wheat Triticum monococcum affects heading time, spike development, and spikelet number. In this study, the Eps1 orthologous regions from rice, Aegilops tauschii, and Brachypodium distachyon were compared as part of current efforts to clone this gene. A single Brachypodium BAC clone spanned the Eps-Am1 region, but a gap was detected in the A. tauschii physical map. Sequencing of the Brachypodium and A. tauschii BAC clones revealed three genes shared by the three species, which showed higher identity between wheat and Brachypodium than between them and rice. However, most of the structural changes were detected in the wheat lineage. These included an inversion encompassing the wg241-VatpC region and the presence of six unique genes. In contrast, only one unique gene (and one pseudogene) was found in Brachypodium and none in rice. Three genes were present in both Brachypodium and wheat but were absent in rice. Two of these genes, Mot1 and FtsH4, were completely linked to the earliness per se phenotype in the T. monococcum high-density genetic map and are candidates for Eps-Am1. Both genes were expressed in apices and developing spikes, as expected for Eps-Am1 candidates. The predicted MOT1 protein showed amino acid differences between the parental T. monococcum lines, but its effect is difficult to predict. Future steps to clone the Eps-Am1 gene include the generation of mot1 and ftsh4 mutants and the completion of the T. monococcum physical map to test for the presence of additional candidate genes
Brassica orthologs from BANYULS belong to a small multigene family, which is involved in procyanidin accumulation in the seed
Identification of a novel major locus for gray leaf spot resistance in Italian ryegrass (Lolium multiflorumLam.)
A 1,000-loci transcript map of the barley genome: new anchoring points for integrative grass genomics
An integrated barley transcript map (consensus
map) comprising 1,032 expressed sequence tag
(EST)-based markers (total 1,055 loci: 607 RFLP, 190
SSR, and 258 SNP), and 200 anchor markers from previously
published data, has been generated by mapping
in three doubled haploid (DH) populations. Between
107 and 179 EST-based markers were allocated to the
seven individual barley linkage groups. The map covers
1118.3 cM with individual linkage groups ranging from
130 cM (chromosome 4H) to 199 cM (chromosome
3H), yielding an average marker interval distance of
0.9 cM. 475 EST-based markers showed a syntenic
organisation to known colinear linkage groups of the
rice genome, providing an extended insight into the
status of barley/rice genome colinearity as well as
ancient genome duplications predating the divergence
of rice and barley. The presented barley transcript map
is a valuable resource for targeted marker saturation
and identiWcation of candidate genes at agronomically
important loci. It provides new anchor points for
detailed studies in comparative grass genomics and will
support future attempts towards the integration of
genetic and physical mapping information