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AUX/LAX family of auxin influx carriers-an overview.

Swarup R, Péret B - Front Plant Sci (2012)

Bottom Line: Auxin is unique among plant hormones for exhibiting polar transport.Of the four AUX/LAX genes, AUX1 regulates root gravitropism, root hair development and leaf phyllotaxy whereas LAX2 regulates vascular development in cotyledons.Both AUX1 and LAX3 have been implicated in lateral root (LR) development as well as apical hook formation whereas both AUX1 and LAX1 and possibly LAX2 are required for leaf phyllotactic patterning.

View Article: PubMed Central - PubMed

Affiliation: School of Biosciences and Centre for Plant Integrative Biology, University of Nottingham Loughborough, UK.

ABSTRACT
Auxin regulates several aspects of plant growth and development. Auxin is unique among plant hormones for exhibiting polar transport. Indole-3-acetic acid (IAA), the major form of auxin in higher plants, is a weak acid and its intercellular movement is facilitated by auxin influx and efflux carriers. Polarity of auxin movement is provided by asymmetric localization of auxin carriers (mainly PIN efflux carriers). PIN-FORMED (PIN) and P-GLYCOPROTEIN (PGP) family of proteins are major auxin efflux carriers whereas AUXIN1/LIKE-AUX1 (AUX/LAX) are major auxin influx carriers. Genetic and biochemical evidence show that each member of the AUX/LAX family is a functional auxin influx carrier and mediate auxin related developmental programmes in different organs and tissues. Of the four AUX/LAX genes, AUX1 regulates root gravitropism, root hair development and leaf phyllotaxy whereas LAX2 regulates vascular development in cotyledons. Both AUX1 and LAX3 have been implicated in lateral root (LR) development as well as apical hook formation whereas both AUX1 and LAX1 and possibly LAX2 are required for leaf phyllotactic patterning.

No MeSH data available.


Lateral root are formed within the pericycle deep inside the primary root and have to emerge through the outer tissue, passing through the endodermal, cortical (blue), and epidermal cells (A). Mechanism proposed by Swarup et al. (2008) describing how auxin (IAA) entering the cortical cell induces the expression of LAX3. This generates the establishment of a positive feedback loop that triggers high auxin levels and subsequent induction of cell wall remodeling (CWR) genes, such as the polygalacturonase (PG)(B).
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Figure 4: Lateral root are formed within the pericycle deep inside the primary root and have to emerge through the outer tissue, passing through the endodermal, cortical (blue), and epidermal cells (A). Mechanism proposed by Swarup et al. (2008) describing how auxin (IAA) entering the cortical cell induces the expression of LAX3. This generates the establishment of a positive feedback loop that triggers high auxin levels and subsequent induction of cell wall remodeling (CWR) genes, such as the polygalacturonase (PG)(B).

Mentions: LRs originate from the pericycle cells that divide and self organize to create a new primordium (Dubrovsky et al., 2000, 2001). As the LR formation process occurs deep inside the primary root tissues (Figure 4A), the newly formed organ has to penetrate through several layers of cells ranging from 3 in Arabidopsis (Swarup et al., 2008; Péret et al., 2009a,b) to as many as 15 in rice (Rebouillat et al., 2008). Several lines of evidences implicate auxin in LR initiation and development (Péret et al., 2009a,b).


AUX/LAX family of auxin influx carriers-an overview.

Swarup R, Péret B - Front Plant Sci (2012)

Lateral root are formed within the pericycle deep inside the primary root and have to emerge through the outer tissue, passing through the endodermal, cortical (blue), and epidermal cells (A). Mechanism proposed by Swarup et al. (2008) describing how auxin (IAA) entering the cortical cell induces the expression of LAX3. This generates the establishment of a positive feedback loop that triggers high auxin levels and subsequent induction of cell wall remodeling (CWR) genes, such as the polygalacturonase (PG)(B).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3475149&req=5

Figure 4: Lateral root are formed within the pericycle deep inside the primary root and have to emerge through the outer tissue, passing through the endodermal, cortical (blue), and epidermal cells (A). Mechanism proposed by Swarup et al. (2008) describing how auxin (IAA) entering the cortical cell induces the expression of LAX3. This generates the establishment of a positive feedback loop that triggers high auxin levels and subsequent induction of cell wall remodeling (CWR) genes, such as the polygalacturonase (PG)(B).
Mentions: LRs originate from the pericycle cells that divide and self organize to create a new primordium (Dubrovsky et al., 2000, 2001). As the LR formation process occurs deep inside the primary root tissues (Figure 4A), the newly formed organ has to penetrate through several layers of cells ranging from 3 in Arabidopsis (Swarup et al., 2008; Péret et al., 2009a,b) to as many as 15 in rice (Rebouillat et al., 2008). Several lines of evidences implicate auxin in LR initiation and development (Péret et al., 2009a,b).

Bottom Line: Auxin is unique among plant hormones for exhibiting polar transport.Of the four AUX/LAX genes, AUX1 regulates root gravitropism, root hair development and leaf phyllotaxy whereas LAX2 regulates vascular development in cotyledons.Both AUX1 and LAX3 have been implicated in lateral root (LR) development as well as apical hook formation whereas both AUX1 and LAX1 and possibly LAX2 are required for leaf phyllotactic patterning.

View Article: PubMed Central - PubMed

Affiliation: School of Biosciences and Centre for Plant Integrative Biology, University of Nottingham Loughborough, UK.

ABSTRACT
Auxin regulates several aspects of plant growth and development. Auxin is unique among plant hormones for exhibiting polar transport. Indole-3-acetic acid (IAA), the major form of auxin in higher plants, is a weak acid and its intercellular movement is facilitated by auxin influx and efflux carriers. Polarity of auxin movement is provided by asymmetric localization of auxin carriers (mainly PIN efflux carriers). PIN-FORMED (PIN) and P-GLYCOPROTEIN (PGP) family of proteins are major auxin efflux carriers whereas AUXIN1/LIKE-AUX1 (AUX/LAX) are major auxin influx carriers. Genetic and biochemical evidence show that each member of the AUX/LAX family is a functional auxin influx carrier and mediate auxin related developmental programmes in different organs and tissues. Of the four AUX/LAX genes, AUX1 regulates root gravitropism, root hair development and leaf phyllotaxy whereas LAX2 regulates vascular development in cotyledons. Both AUX1 and LAX3 have been implicated in lateral root (LR) development as well as apical hook formation whereas both AUX1 and LAX1 and possibly LAX2 are required for leaf phyllotactic patterning.

No MeSH data available.