Welcome To Website IAS

Hot news
Achievement

Independence Award

- First Rank - Second Rank - Third Rank

Labour Award

- First Rank - Second Rank -Third Rank

National Award

 - Study on food stuff for animal(2005)

 - Study on rice breeding for export and domestic consumption(2005)

VIFOTEC Award

- Hybrid Maize by Single Cross V2002 (2003)

- Tomato Grafting to Manage Ralstonia Disease(2005)

- Cassava variety KM140(2010)

Centres
Website links
Vietnamese calendar
Library
Visitors summary
 Curently online :  4
 Total visitors :  3966294

Targeted linkage map densification to improve cell wall related QTL detection and interpretation in maize
Sunday, 2013/05/12 | 13:18:44

Abstract

 

Several QTLs for cell wall degradability and lignin content were previously detected in the F288 × F271 maize RIL progeny, including a set of major QTLs located in bin 6.06. Unexpectedly, allelic sequencing of genes located around the bin 6.06 QTL positions revealed a monomorphous region, suggesting that these QTLs were likely “ghost” QTLs.

 

Refining the positions of all QTLs detected in this population was thus considered, based on a linkage map densification in most important QTL regions, and in several large still unmarked regions. Re-analysis of data with an improved genetic map (173 markers instead of 108) showed that ghost QTLs located in bin 6.06 were then fractionated over two QTL positions located upstream and downstream of the monomorphic region.

 

The area located upstream of bin 6.06 position carried the major QTLs, which explained from 37 to 59 % of the phenotypic variation for per se values and extended on only 6 cM, corresponding to a physical distance of 2.2 Mbp. Among the 92 genes present in the corresponding area of the B73 maize reference genome, nine could putatively be considered as involved in the formation of the secondary cell wall [bHLH, FKBP, laccase, fasciclin, zinc finger C2H2-type and C3HC4-type (two genes), NF-YB, and WRKY]. In addition, based on the currently improved genetic map, eight QTLs were detected in bin 4.09, while only one QTL was highlighted in the initial investigation.

 

Moreover, significant epistatic interaction effects were shown for all traits between these QTLs located in bin 4.09 and the major QTLs located in bin 6.05. Three genes related to secondary cell wall assembly (ZmMYB42, COV1-like, PAL-like) underlay QTL support intervals in this newly identified bin 4.09 region. The current investigations, even if they were based only on one RIL progeny, illustrated the interest of a targeted marker mapping on a genetic map to improve QTL position.

 

Read the research article at Theoretical and Applied Genetics, Volume 126, Issue 5, May 2013, p.1151-1165

 

Back      Print      View: 2507

[ Other News ]___________________________________________________
  • Transgenic pig carrying green fluorescent proteasomes
  • Ammonia oxidation pathways and nitrifier denitrification are significant sources of N2O and NO under low oxygen availability
  • Genetic analysis and mapping of genes for resistance to multiple strains of Soybean mosaic virus in a single resistant soybean accession PI 96983
  • Genomic assay reveals tolerance of DNA damage by both translesion DNA synthesis and homology-dependent repair in mammalian cells
  • IRRI Scientists Develop Super Salt-tolerant Rice
  • A dominant major locus in chromosome 9 of rice (Oryza sativa L.) confers tolerance to 48°C high temperature at seedling stage.
  • Source-sink dynamics and proteomic reprogramming under elevated night temperature and their impact on rice yield and grain quality
  • Gene similarity networks provide tools for understanding eukaryote origins and evolution
  • Suppression of Arabidopsis protophloem differentiation and root meristem growth by CLE45 requires the receptor-like kinase BAM3
  • Bacillus subtilis biofilm induction by plant polysaccharides
  • Scientists Re-evaluate Nutrient Uptake of Modern Corn
  • A Dominant Major Locus in Chromosome 9 of Rice (Oryza sativa L.) Confers Tolerance to 48 °C High Temperature at Seedling Stage
  • Scientists Identify Proton Pathway in Photosynthesis
  • Scientists Find Way to Increase Phosphorus Content in Wheat
  • De novo next-generation sequencing, assembling and annotation of Arachis hypogaea L. Spanish botanical type whole plant transcriptome
  • Fine-mapping and molecular marker development for Pi56(t), a NBS-LRR gene conferring broad-spectrum resistance to Magnaporthe oryzae in rice
  • Genome-wide comparative diversity uncovers multiple targets of selection for improvement in hexaploid wheat landraces and cultivars
  • Smoke-derived karrikin perception by the α/β-hydrolase KAI2 from Arabidopsis
  • USDA Approves Testing of Pink Pineapple
  • Characterization and fine mapping of the rice premature senescence mutant ospse1
Designed & Powered by WEBSO CO.,LTD