The auxin influx carriers AUX1 and LAX3 are involved in auxin-ethylene interactions during apical hook development in Arabidopsis thaliana seedlings

F. Vandenbussche, J. Petrášek, P. Žádníková, K. Hoyerová, B. Pešek, V. Raz, R. Swarup, M. Bennett, E. Zažímalová, E. Benková, D. Van Der Straeten, Development 137 (2010) 597–606.

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Abstract
Dark-grown dicotyledonous seedlings form a hook-like structure at the top of the hypocotyl, which is controlled by the hormones auxin and ethylene. Hook formation is dependent on an auxin signal gradient, whereas hook exaggeration is part of the triple response provoked by ethylene in dark-grown Arabidopsis seedlings. Several other hormones and light are also known to be involved in hook development, but the molecular mechanisms that lead to the initial installation of an auxin gradient are still poorly understood. In this study, we aimed to unravel the cross-talk between auxin and ethylene in the apical hook. Auxin measurements, the expression pattern of the auxin reporter DR5::GUS and the localization of auxin biosynthesis enzymes and influx carriers collectively indicate the necessity for auxin biosynthesis and efficient auxin translocation from the cotyledons and meristem into the hypocotyl in order to support proper hook development. Auxin accumulation in the meristem and cotyledons and in the hypocotyl is increased ∼2-fold upon treatment with ethylene. In addition, a strong ethylene signal leads to enhanced auxin biosynthesis at the inner side of the hook. Finally, mutant analysis demonstrates that the auxin influx carrier LAX3 is indispensable for proper hook formation, whereas the auxin influx carrier AUX1 is involved in the hook exaggeration phenotype induced by ethylene.
Publishing Year
Date Published
2010-02-15
Journal Title
Development
Volume
137
Issue
4
Page
597 - 606
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Vandenbussche F, Petrášek J, Žádníková P, et al. The auxin influx carriers AUX1 and LAX3 are involved in auxin-ethylene interactions during apical hook development in Arabidopsis thaliana seedlings. Development. 2010;137(4):597-606. doi:10.1242/dev.040790
Vandenbussche, F., Petrášek, J., Žádníková, P., Hoyerová, K., Pešek, B., Raz, V., … Van Der Straeten, D. (2010). The auxin influx carriers AUX1 and LAX3 are involved in auxin-ethylene interactions during apical hook development in Arabidopsis thaliana seedlings. Development, 137(4), 597–606. https://doi.org/10.1242/dev.040790
Vandenbussche, Filip, Jan Petrášek, Petra Žádníková, Klára Hoyerová, Bedřich Pešek, Vered Raz, Ranjan Swarup, et al. “The Auxin Influx Carriers AUX1 and LAX3 Are Involved in Auxin-Ethylene Interactions during Apical Hook Development in Arabidopsis Thaliana Seedlings.” Development 137, no. 4 (2010): 597–606. https://doi.org/10.1242/dev.040790.
F. Vandenbussche et al., “The auxin influx carriers AUX1 and LAX3 are involved in auxin-ethylene interactions during apical hook development in Arabidopsis thaliana seedlings,” Development, vol. 137, no. 4, pp. 597–606, 2010.
Vandenbussche F, Petrášek J, Žádníková P, Hoyerová K, Pešek B, Raz V, Swarup R, Bennett M, Zažímalová E, Benková E, Van Der Straeten D. 2010. The auxin influx carriers AUX1 and LAX3 are involved in auxin-ethylene interactions during apical hook development in Arabidopsis thaliana seedlings. Development. 137(4), 597–606.
Vandenbussche, Filip, et al. “The Auxin Influx Carriers AUX1 and LAX3 Are Involved in Auxin-Ethylene Interactions during Apical Hook Development in Arabidopsis Thaliana Seedlings.” Development, vol. 137, no. 4, Company of Biologists, 2010, pp. 597–606, doi:10.1242/dev.040790.

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