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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.


Related in: MedlinePlus

Auxin influx transporters are involved in biotic interactions. During the actinorhizal symbiosis, Frankia infects the plant cell and triggers the expression of CgAUX1, resulting in auxin (IAA) uptake by the plant. Auxin is presumably synthesized by the actinobacteria (Péret et al., 2007) (A). During cyst nematode infection, effector proteins are released in the plant cell. The 19C07 protein has been shown to directly interact with LAX3. High expression levels of LAX3 in the feeding site and adjacent cells participates in the incorporation of these cells in the feeding sites by promoting cell wall remodeling (CWR) (Lee et al., 2011) (B).
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Figure 5: Auxin influx transporters are involved in biotic interactions. During the actinorhizal symbiosis, Frankia infects the plant cell and triggers the expression of CgAUX1, resulting in auxin (IAA) uptake by the plant. Auxin is presumably synthesized by the actinobacteria (Péret et al., 2007) (A). During cyst nematode infection, effector proteins are released in the plant cell. The 19C07 protein has been shown to directly interact with LAX3. High expression levels of LAX3 in the feeding site and adjacent cells participates in the incorporation of these cells in the feeding sites by promoting cell wall remodeling (CWR) (Lee et al., 2011) (B).

Mentions: In actinorhizal plant Casuarina glauca, a symbiotic interaction with soil actinobacteria from the Frankia species leads to infection of the host plant cell and subsequent development of a new organ “the actinorhizal nodule” the site of bacterial nitrogen fixation. Nodule formation in Casuarina glauca, can be severely impaired by treatment with auxin influx inhibitor 2-NOA suggesting that auxin influx activity is associated with nodule formation (Péret et al., 2007). This is further supported by molecular studies that show that a homolog of Arabidopsis AUX1 “CgAUX1” is expressed in all the infected cells, underlining its importance in the infection process (Figure 5A).


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

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

Auxin influx transporters are involved in biotic interactions. During the actinorhizal symbiosis, Frankia infects the plant cell and triggers the expression of CgAUX1, resulting in auxin (IAA) uptake by the plant. Auxin is presumably synthesized by the actinobacteria (Péret et al., 2007) (A). During cyst nematode infection, effector proteins are released in the plant cell. The 19C07 protein has been shown to directly interact with LAX3. High expression levels of LAX3 in the feeding site and adjacent cells participates in the incorporation of these cells in the feeding sites by promoting cell wall remodeling (CWR) (Lee et al., 2011) (B).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 5: Auxin influx transporters are involved in biotic interactions. During the actinorhizal symbiosis, Frankia infects the plant cell and triggers the expression of CgAUX1, resulting in auxin (IAA) uptake by the plant. Auxin is presumably synthesized by the actinobacteria (Péret et al., 2007) (A). During cyst nematode infection, effector proteins are released in the plant cell. The 19C07 protein has been shown to directly interact with LAX3. High expression levels of LAX3 in the feeding site and adjacent cells participates in the incorporation of these cells in the feeding sites by promoting cell wall remodeling (CWR) (Lee et al., 2011) (B).
Mentions: In actinorhizal plant Casuarina glauca, a symbiotic interaction with soil actinobacteria from the Frankia species leads to infection of the host plant cell and subsequent development of a new organ “the actinorhizal nodule” the site of bacterial nitrogen fixation. Nodule formation in Casuarina glauca, can be severely impaired by treatment with auxin influx inhibitor 2-NOA suggesting that auxin influx activity is associated with nodule formation (Péret et al., 2007). This is further supported by molecular studies that show that a homolog of Arabidopsis AUX1 “CgAUX1” is expressed in all the infected cells, underlining its importance in the infection process (Figure 5A).

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.


Related in: MedlinePlus