How many genes are in Arabidopsis thaliana?
Below is a summary of major findings described in a groundbreaking paper, “The Arabidopsis Genome Initiative”, Analysis of the genome sequence of the flowering plant Arabidopsis thaliana” (Nature 408, 796-815, 2000). The genome of Arabidopsis: Contains about 125 megabases of sequence. Encodes approximately 25,500 genes.
What do R genes detect?
R genes code for proteins that recognize specific pathogen effectors, known as avirulence proteins, in a specific gene-for-gene fashion. They are classified, according to their domain organization, in nucleotide-binding leucine-rich repeat (NB-LRR) and the extracellular LRR resistance proteins.
Why is Arabidopsis thaliana a good model organism?
It possesses a relatively small, genetically tractable genome that can be manipulated through genetic engineering more easily and rapidly than any other plant genome.
How many protein coding genes are in Arabidopsis?
27,000 protein-coding
The Arabidopsis thaliana genome has a haploid chromosome number of 5, containing 135 Mb with about 27,000 protein-coding genes encoding around 35,000 proteins.
What is R gene resistance?
Dominant plant disease resistance (R) genes confer resistance to a variety of biotrophic pathogens, including viruses, encoding corresponding dominant avirulence (Avr) genes. R genes are among the most highly variable plant genes known, both within and between populations.
What are plant R proteins?
Plants deploy a large number of resistance (R) proteins to detect invading pathogens. The R proteins are encoded by resistance genes that contain cell surface-localized receptors and intracellular receptors.
Why Arabidopsis is a model plant for Dicots?
Some of its advantages as a model organism: It has one of the smallest genomes in the plant kingdom: 135 x 106 base pairs of DNA distributed in 5 chromosomes (2n = 10) and almost all of which encodes its 27,407 genes.
How do you identify a protein coding gene?
Putative protein-coding genes are identified based on computational analysis of genomic data—typically, by the presence of an open-reading frame (ORF) exceeding ≈300 bp in a cDNA sequence.
When did Arabidopsis become a model organism?
It is used as a model organism to study plant biology. Studies on Arabidopsis started in the early 1900s, but only in 1998 was it declared a model organism. It has no direct relevance to agriculture as it is considered a weed. It is present across the world and there are many ecotypes or accessions available.
What is the size of Arabidopsis thaliana nuclear genome?
125 Mb
Its nuclear genome is small (125 Mb) and has been completely sequenced.
What is effector triggered immunity in plants?
Effector triggered immunity (ETI) is the plant immune response that specifically include transcription processes in the host nucleus. For example, successful pathogens endorse pathogenesis by injecting effector proteins into the plant cell.