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Developmental roles of AUX1/LAX auxin influx carriers in plants

Swarup, Ranjan; Bhosale, Rahul


Beacon Nottingham Research Fellow


Plant hormone auxin regulates several aspects of plant growth and development. Auxin is predominantly synthesized in the shoot apex and developing leaf primordia and from there it is transported to the target tissues e.g. roots. Auxin transport is polar in nature and is carrier-mediated. AUXIN1/LIKE-AUX1 (AUX1/LAX) family members are the major auxin influx carriers whereas PIN-FORMED (PIN) family and some members of the P-GLYCOPROTEIN/ ATP-BINDING CASSETTE B4 (PGP/ABCB) family are major auxin efflux carriers. AUX1/LAX auxin influx carriers are multi-membrane spanning transmembrane proteins sharing similarity to amino acid permeases. Mutations in AUX1/LAX genes result in auxin related developmental defects and have been implicated in regulating key plant processes including root and lateral root development, root gravitropism, root hair development, vascular patterning, seed germination, apical hook formation, leaf morphogenesis, phyllotactic patterning, female gametophyte development and embryo development. Recently AUX1 has also been implicated in regulating plant responses to abiotic stresses. This review summarizes our current understanding of the developmental roles of AUX1/LAX gene family and will also briefly discuss the modelling approaches that are providing new insight into the role of auxin transport in plant development.


Swarup, R., & Bhosale, R. (2019). Developmental roles of AUX1/LAX auxin influx carriers in plants. Frontiers in Plant Science, 10,

Journal Article Type Review
Acceptance Date Sep 19, 2019
Online Publication Date Oct 28, 2019
Publication Date Oct 28, 2019
Deposit Date Sep 26, 2019
Publicly Available Date Oct 29, 2019
Journal Frontiers in Plant Science
Electronic ISSN 1664-462X
Publisher Frontiers Media
Peer Reviewed Peer Reviewed
Volume 10
Article Number 1306
Keywords auxin, auxin influx carriers, AUX1, LAX1, LAX2, LAX3, auxin transport, Root gravitropism, AUX1/LAX, plant development
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