What is QTL in rice?

What is QTL in rice?

The genetic basis of rice grain width was dissected into six additive quantitative trait loci (QTL) and 11 pairs of epistatic QTL using an F7 recombinant inbred line (RIL) population derived from a single cross between Asominori (japonica) and IR24 (indica).

What are differences between QTL mapping and association mapping?

Linkage based QTL mapping involves biparental mating for contrasting trait of interest while association mapping utilises historical recombination events in naturally occurring population/germplasm.

What is QTL mapping used for?

The primary purpose of QTL mapping is to localize chromosomal regions that significantly affect the variation of quantitative traits in a population. This localization is important for the ultimate identification of responsible genes and also for our understanding of genetic mechanisms of the variation.

How is QTL mapping done?

QTLs are mapped by identifying which molecular markers (such as SNPs or AFLPs) correlate with an observed trait. This is often an early step in identifying the actual genes that cause the trait variation.

What is quantitative trait loci analysis?

Quantitative trait locus (QTL) analysis is a statistical method that links two types of information—phenotypic data (trait measurements) and genotypic data (usually molecular markers)—in an attempt to explain the genetic basis of variation in complex traits (Falconer & Mackay, 1996; Kearsey, 1998; Lynch & Walsh, 1998).

What is linkage mapping in genetics?

A linkage map (also known as a genetic map) is a table for a species or experimental population that shows the position of its known genes or genetic markers relative to each other in terms of recombination frequency, rather than a specific physical distance along each chromosome.

What are different mapping populations used for QTL analysis?

The accompanying animation demonstrates the development of three common types of QTL mapping population: F2, recombinant inbred line, and backcross populations.

What is linkage mapping?

A linkage map is a graph that shows how frequently markers recombine during homologous chromosome crossover. The more recombination (segregation) occurs between two genetic markers, the further apart they are thought to be.

What is QTL mapping in plant breeding?

Abstract. Quantitative Trait Loci (QTL) mapping basically entails finding an association between a genetic marker and a measurable phenotype.

What are 4 types of maps?

Types of Maps

• General Reference (sometimes called planimetric maps)
• Topographic Maps.
• Thematic.
• Navigation Charts.
• Cadastral Maps and Plans.

How is a linkage map created?

The linkage map describes the linear order of markers within linkage groups. Creating a map is divided into two stages: a. forming groups of linked markers; b. estimating the most likely order of the markers within the groups.

What is QTL mapping PDF?

QTL Mapping- process of construction of linkage maps and conducting QTL analysis to identify genomic regions associated with traits.

What are the requirements for QTL mapping?

The requirements of QTL mapping are mapping population, saturated linkage map, phenotypic screening and statistical package.

What do linkage mapping methods identify?

We can see if two genes are linked, and how tightly, by using data from genetic crosses to calculate the recombination frequency. By finding recombination frequencies for many gene pairs, we can make linkage maps that show the order and relative distances of the genes on the chromosome.

What is importance of linkage?

Linkage reduces the chance of recombination of genes and thus, helps to hold parental characteristics together. It thus helps organism to maintain its parental, racial and other characters.

Is linkage-based QTL mapping useful for identifying important agronomic genes in rice?

Traditional linkage-based QTL mapping has made great progress in identifying important agronomic genes in rice, such as Gn1a, which controls grain number ( Ashikari et al., 2005 ), and GS3, which controls grain weight and length ( Fan et al., 2006 ). Despite its merits, linkage-based QTL mapping has some limitations.

How many quantitative trait loci (QTLs) are there in rice?

A linkage mapping population with 180 recombinant inbred lines and an association mapping population containing 237 rice varieties were used to identify genes linked to RDR. Six quantitative trait loci (QTLs) of RDR were identified as being located on chromosomes 1, 2, 4, 7, and 10.

Which QTL is involved in deep rooting of rice under upland conditions?

Dro1, a major QTL involved in deep rooting of rice under upland field conditions . Journal of Experimental Botany 62, 2485–2494. [ PubMed] [ Google Scholar] [ Ref list]

Does linkage-based QTL mapping overlap with population-specific SNPs?

However, only a few of the SNPs overlapped with the QTLs identified by linkage-based QTL mapping, and most of them were population specific ( Table 2, Fig. 3 ).