Overview

Brief Summary

Arabidopsis, rockcress is a genus of small usually annual flowering plants in the Brassicaceae (mustard family, which also includes cabbage and broccoli). This genus contains thale or mouse-ear cress (Arabidopsis thaliana), which is an important model organism in plant biology and it was the first plant to have its entire genome sequenced, in the year 2000. Members of this genus, especially thale cress, are typically fast-growing and complete their life cycles quickly--from germination and growth to flowering and seed set in 4 to 6 weeks; the short generation times allow genetic changes or manipulations to be easily observed, making it a useful model.

Currently, the genus Arabidopsis has nine species and eight subspecies, based on recent morphological and molecular phylogenies by O'Kane & Al-Shehbaz (1997, 2003) and others. Their findings confirm that the species formerly included in Arabidopsis made it polyphyletic. The most recent reclassification moves two species previously placed in Cardaminopsis and Hylandra and three species of Arabis into Arabidopsis, but excludes 50 that have been moved into the new genera Beringia, Crucihimalaya, Ianhedgea, Olimarabidopsis, and Pseudoarabidopsis.

All Arabidopsis species are indigenous to Europe, while two of the species have broad ranges also extending into North America and Asia. Although many species in the Brassicaceae are edible, Arabidopsis species are not noted as edible plants, and are generally considered weeds due to their widespread distribution in agricultural fields, roadside, and disturbed lands.

(NSF 2012, O’Kane & Al-Shehbaz 1997, O’Kane & Al-Shehbaz 2003.)

  • NSF (National Science Foundation). 2012. A rose is a rose is a mustard weed. Accessed 21 March 2012 from http://www.nsf.gov/about/history/nsf0050/arabidopsis/arose.htm.
  • O'Kane Jr, S. L., and I.A. Al-Shehbaz. 1997. A synopsis of Arabidopsis (Brassicaceae): Novon 7: 323–327.
  • O'Kane Jr, S. L., and I.A. Al-Shehbaz. 2003. Phylogenetic position and generic limits of Arabidopsis (Brassicaceae) based on sequences of nuclear ribosomal DNA. Annals of the Missouri Botanical Garden 90 (4): 603-612.
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Evolution and Systematics

Functional Adaptations

Functional adaptation

Leaves transmit long-distance signals: Arabidopsis
 

Leaves of Arabidopsis plants send long-distance signals to induce flowering with help from a protein messenger.

   
  "In plants, seasonal changes in day length are perceived in leaves, which initiate long-distance signaling that induces flowering at the shoot apex. The identity of the long-distance signal has yet to be determined. In Arabidopsis, activation of FLOWERING LOCUS T (FT) transcription in leaf vascular tissue (phloem) induces flowering. We found that FT messenger RNA is required only transiently in the leaf. In addition, FT fusion proteins expressed specifically in phloem cells move to the apex and move long distances between grafted plants. Finally, we provide evidence that FT does not activate an intermediate messenger in leaves. We conclude that FT protein acts as a long-distance signal that induces Arabidopsis flowering." (Corbesier 2007:1030)
  Learn more about this functional adaptation.
  • Corbesier, L.; Vincent, C.; Jang, S.; Fornara, F.; Fan, Q.; Searle, I.; Giakountis, A.; Farrona, S.; Gissot, L.; Turnbull, C. 2007. FT Protein Movement Contributes to Long-Distance Signaling in Floral Induction of Arabidopsis. Science. 316(5827): 1030.
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
Specimen Records: 109
Specimens with Sequences: 143
Specimens with Barcodes: 104
Species: 14
Species With Barcodes: 12
Public Records: 66
Public Species: 8
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Barcode data

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Wikipedia

Arabidopsis

This article is about the genus. For the model organism, see Arabidopsis thaliana.

Arabidopsis (rockcress) is a genus in the family Brassicaceae. They are small flowering plants related to cabbage and mustard. This genus is of great interest since it contains thale cress (Arabidopsis thaliana), one of the model organisms used for studying plant biology and the first plant to have its entire genome sequenced. Changes in thale cress are easily observed, making it a very useful model. The American space agency, NASA, plans to grow Arabidopsis on the Moon in 2015[1] and on Mars by 2021.[2]

Status[edit]

Currently, the genus Arabidopsis has 9 species and a further eight subspecies recognised. This delimitation is quite recent, and is based on morphological and molecular phylogenies by O'Kane and Al-Shehbaz (1997, 2003) and others.

Their findings confirm the species formerly included in Arabidopsis made it polyphyletic. The most recent reclassification moves two species previously placed in Cardaminopsis and Hylandra and three species of Arabis into Arabidopsis, but excludes 50 that have been moved into the new genera Beringia, Crucihimalaya, Ianhedgea, Olimarabidopsis, and Pseudoarabidopsis.

All of the species in Arabidopsis are indigenous to Europe, while two of the species have broad ranges also extending into North America and Asia.

In the last two decades, Arabidopsis thaliana has gained much interest from the scientific community as a model organism for research on numerous aspects of plant biology. The Arabidopsis Information Resource (TAIR) is a curated online information source for Arabidopsis thaliana genetic and molecular biology research, and The Arabidopsis Book is an online compilation of invited chapters on Arabidopsis thaliana biology. In Europe, the model organism resource centre for Arabidopsis thaliana germplasm, bioinformatics and molecular biology resources (including GeneChips) is the Nottingham Arabidopsis Stock CentreNASC whilst in North America germplasm services are provided by the Arabidopsis Biological Resource Center, (ABRC) based at the Ohio State University. The ordering system for ABRC was incorporated into The Arabidopsis Information Resource (TAIR) database in June 2001 whilst NASC has always (since 1991) hosted its own ordering system and genome browser.

A. thaliana in partial in vitro conditions[edit]

Recently, A. thaliana tissues have been cultivated in microfluidic devices. Plant-on-chip devices show promise for future research in understanding the mechanism of sexual reproduction in A. thaliana.[3]

List of species and subspecies[edit]

Distribution: Greenland, Labrador, Nunavut, Québec, Ontario, Manitoba, Saskatchewan
A. arenosa subsp. arenosa
Distribution: Europe: native in Austria, Belarus, Bosnia Herzegovina, Bulgaria, Croatia, Czech Republic, NE France, Germany, Hungary, N Italy, Latvia, Lithuania, Macedonia, Poland, Romania, Slovakia, Slovenia, Switzerland, Ukraine, and Yugoslavia; naturalized in Belgium, Denmark, Estonia, Finland, Netherlands, Norway, Russia and W Siberia, and Sweden; absent in Albania, Greece, C and S Italy, and Turkey.
A. arenosa subsp. borbasii
Distribution: E Belgium, Czech Republic, NE France, Germany, Hungary, Poland, Romania, Slovakia, Switzerland, Ukraine. Doubtfully occurring in Denmark.
Distribution: SE France.
Distribution: Bosnia, Croatia.
A. halleri subsp. halleri
Distribution: Austria, Croatia, Czech Republic, Germany, N and C Italy, Poland, Romania, Slovakia, Slovenia, Switzerland, and S Ukraine. Probably introduced in N France and extinct in Belgium.
A. halleri subsp. ovirensis (Wulfen)
Distribution: Albania, Austria, NE Italy, Romania, Slovakia, Slovenia, SW Ukraine, Yugoslavia.
A. halleri subsp. gemmifera (Matsumura)
Distribution: Russian Far East, northeastern China, Korea, Japan, and Taiwan.
A. lyrata subsp. lyrata
Distribution: NE European Russia, Alaska, Canada (Ontario west into British Columbia), and southeastern and central United States (Vermont south into northern Georgia and Mississippi northward into Missouri and Minnesota).
A. lyrata subsp. petraea (Linnaeus) O'Kane & Al-Shehbaz
Distribution: Austria, Czech Republic, England, Germany, Hungary, Iceland, Ireland, N. Italy, Norway, Russia (NW Russia, Siberia and Far East), Scotland, Sweden, Ukraine, boreal North America (Alaska and Yukon). Apparently extinct in Poland.
A. lyrata subsp. kamchatica (Fischer ex D.C.) O'Kane & Al-Shehbaz
Distribution: boreal Alaska, Canada (Yukon, Mackenzie District, British Columbia, northern Saskatchewan), Aleutian Islands, eastern Siberia, the Russian Far East, Korea, northern China, Japan, and Taiwan.
Distribution: Carpathian Mountains (Poland, Romania, Slovakia, and adjacent Ukraine).
Distribution: northwestern Italy and, presumably extinct, in adjacent SW Switzerland.
Distribution: Fennoscandinavia and the Baltic region.
Distribution: native range almost all Europe to central Asia, now naturalized worldwide.

Cytogenetics[edit]

Cytogenetic analysis has shown the haploid chromosome number (n) is variable and can be 5, 8 and 13.[citation needed]

A. thaliana is n=5 and the DNA sequencing of this species was completed in 2001.

A. suecica is n=13 (5+8) and is an amphidiploid species originated through hybridization between A. thaliana and diploid A. arenosa.

A. neglecta is n=8, as are the various subspecies of A. halleri.

Various subspecies of A. lyrata and A. arenosa can be either 2n (diploid) or 4n (tetraploid).

As of 2005, A. cebennensis, A. croatica and A. pedemontana have not been investigated cytologically.

Reclassified species[edit]

The following species previously placed in Arabidopsis are not currently considered part of the genus.

Sources[edit]

  • O'Kane Jr, S. L., & Al-Shehbaz, I. A. (1997). A synopsis of Arabidopsis (Brassicaceae): Novon 7: 323–327.
  • Al-Shehbaz, I. A., O'Kane, Steve L. (2002). Taxonomy and Phylogeny of Arabidopsis (Brassicaceae). The Arabidopsis Book: 1-22. online version.
  • Martin et al. (2002) Evolutionary analysis of Arabidopsis, cyanobacterial, and chloroplast genomes reveals plastid phylogeny and thousands of cyanobacterial genes in the nucleus. online version
  • O'Kane Jr, S. L., & Al-Shehbaz, I. A. (2003). Phylogenetic position and generic limits of Arabidopsis (Brassicaceae) based on sequences of nuclear ribosomal DNA: Annals of the Missouri Botanical Garden 90 (4): 603-612

References[edit]

  1. ^ LPX First flight of Lunar plant growth experiment NASA Ames Research Center, 2013-05-17
  2. ^ [1] International Business Times
  3. ^ AK Yetisen, L Jiang, J R Cooper, Y Qin, R Palanivelu and Y Zohar (May 2011). "A microsystem-based assay for studying pollen tube guidance in plant reproduction.". J. Micromech. Microeng. 25. 
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