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An auxin transport mechanism restricts positive orthogravitropism in lateral roots

(2013) CURRENT BIOLOGY. 23(9). p.817-822
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Abstract
As soon as a seed germinates, plant growth relates to gravity to ensure that the root penetrates the soil and the shoot expands aerially. Whereas mechanisms of positive and negative orthogravitropism of primary roots and shoots are relatively well understood [1-3], lateral organs often show more complex growth behavior [4]. Lateral roots (LRs) seemingly suppress positive gravitropic growth and show a defined gravitropic set-point angle (GSA) that allows radial expansion of the root system (plagiotropism) [3, 4]. Despite its eminent importance for root architecture, it so far remains completely unknown how lateral organs partially suppress positive orthogravitropism. Here we show, that the phytohormone auxin steers GSA formation and limits positive orthogravitropism in LR. Low and high auxin levels/signaling lead to radial or axial root systems, respectively. At a cellular level, it is the auxin transport-dependent regulation of asymmetric growth in the elongation zone that determines GSA. Our data suggest that strong repression of PIN4/PIN7 and transient PIN3 expression limit auxin redistribution in young LR columella cells. We conclude that PIN activity, by temporally limiting the asymmetric auxin fluxes in the tip of LRs, induces transient, differential growth responses in the elongation zone and, consequently, controls root architecture.
Keywords
GROWTH, TRANSDUCTION, GRAVITROPISM, SET-POINT ANGLE, ARABIDOPSIS, EFFLUX, CELLS, FLOW

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MLA
Rosquete, Michel Ruiz, Daniel von Wangenheim, Peter Marhavy, et al. “An Auxin Transport Mechanism Restricts Positive Orthogravitropism in Lateral Roots.” CURRENT BIOLOGY 23.9 (2013): 817–822. Print.
APA
Rosquete, M. R., von Wangenheim, D., Marhavy, P., Barbez, E., Stelzer, E. H., Benkova, E., Maizel, A., et al. (2013). An auxin transport mechanism restricts positive orthogravitropism in lateral roots. CURRENT BIOLOGY, 23(9), 817–822.
Chicago author-date
Rosquete, Michel Ruiz, Daniel von Wangenheim, Peter Marhavy, Elke Barbez, Ernst HK Stelzer, Eva Benkova, Alexis Maizel, and Jürgen Kleine-Vehn. 2013. “An Auxin Transport Mechanism Restricts Positive Orthogravitropism in Lateral Roots.” Current Biology 23 (9): 817–822.
Chicago author-date (all authors)
Rosquete, Michel Ruiz, Daniel von Wangenheim, Peter Marhavy, Elke Barbez, Ernst HK Stelzer, Eva Benkova, Alexis Maizel, and Jürgen Kleine-Vehn. 2013. “An Auxin Transport Mechanism Restricts Positive Orthogravitropism in Lateral Roots.” Current Biology 23 (9): 817–822.
Vancouver
1.
Rosquete MR, von Wangenheim D, Marhavy P, Barbez E, Stelzer EH, Benkova E, et al. An auxin transport mechanism restricts positive orthogravitropism in lateral roots. CURRENT BIOLOGY. 2013;23(9):817–22.
IEEE
[1]
M. R. Rosquete et al., “An auxin transport mechanism restricts positive orthogravitropism in lateral roots,” CURRENT BIOLOGY, vol. 23, no. 9, pp. 817–822, 2013.
@article{4110210,
  abstract     = {As soon as a seed germinates, plant growth relates to gravity to ensure that the root penetrates the soil and the shoot expands aerially. Whereas mechanisms of positive and negative orthogravitropism of primary roots and shoots are relatively well understood [1-3], lateral organs often show more complex growth behavior [4]. Lateral roots (LRs) seemingly suppress positive gravitropic growth and show a defined gravitropic set-point angle (GSA) that allows radial expansion of the root system (plagiotropism) [3, 4]. Despite its eminent importance for root architecture, it so far remains completely unknown how lateral organs partially suppress positive orthogravitropism. Here we show, that the phytohormone auxin steers GSA formation and limits positive orthogravitropism in LR. Low and high auxin levels/signaling lead to radial or axial root systems, respectively. At a cellular level, it is the auxin transport-dependent regulation of asymmetric growth in the elongation zone that determines GSA. Our data suggest that strong repression of PIN4/PIN7 and transient PIN3 expression limit auxin redistribution in young LR columella cells. We conclude that PIN activity, by temporally limiting the asymmetric auxin fluxes in the tip of LRs, induces transient, differential growth responses in the elongation zone and, consequently, controls root architecture.},
  author       = {Rosquete, Michel Ruiz and von Wangenheim, Daniel and Marhavy, Peter and Barbez, Elke and Stelzer, Ernst HK and Benkova, Eva and Maizel, Alexis and Kleine-Vehn, Jürgen},
  issn         = {0960-9822},
  journal      = {CURRENT BIOLOGY},
  keywords     = {GROWTH,TRANSDUCTION,GRAVITROPISM,SET-POINT ANGLE,ARABIDOPSIS,EFFLUX,CELLS,FLOW},
  language     = {eng},
  number       = {9},
  pages        = {817--822},
  title        = {An auxin transport mechanism restricts positive orthogravitropism in lateral roots},
  url          = {http://dx.doi.org/10.1016/j.cub.2013.03.064},
  volume       = {23},
  year         = {2013},
}

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