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Plant roots use a patterning mechanism to position lateral root branches toward available water

Bao, Yun ; Aggarwal, Pooja ; Robbins, Neil E. ; Sturrock, Craig J. ; Thompson, Mark C. ; Tan, Han Qi ; Tham, Cliff ; Duan, Lina ; Rodriguez, Pedro L. ; Vernoux, Teva ; Mooney, Sacha J. ; Bennett, Malcolm J. ; Dinneny, José R.

Proceedings of the National Academy of Sciences - PNAS, 2014-06, Vol.111 (25), p.9319-9324 [Periódico revisado por pares]

United States: National Academy of Sciences

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Título:
Plant roots use a patterning mechanism to position lateral root branches toward available water
Autor: Bao, Yun ; Aggarwal, Pooja ; Robbins, Neil E. ; Sturrock, Craig J. ; Thompson, Mark C. ; Tan, Han Qi ; Tham, Cliff ; Duan, Lina ; Rodriguez, Pedro L. ; Vernoux, Teva ; Mooney, Sacha J. ; Bennett, Malcolm J. ; Dinneny, José R.
Assuntos: Arabidopsis ; Arabidopsis - genetics ; Arabidopsis - growth & development ; Arabidopsis Proteins - genetics ; Arabidopsis Proteins - metabolism ; Auxins ; Biological Sciences ; Biosynthesis ; Cells ; Corn ; Developmental biology ; Flowers & plants ; Journalism ; Life Sciences ; Nonnative species ; Plant roots ; Plant Roots - genetics ; Plant Roots - growth & development ; Plants ; Rice ; Seedlings ; Signal transduction ; Tomography ; Tryptophan Transaminase - genetics ; Tryptophan Transaminase - metabolism ; Vegetal Biology ; Water ; Xylem
É parte de: Proceedings of the National Academy of Sciences - PNAS, 2014-06, Vol.111 (25), p.9319-9324
Notas: http://dx.doi.org/10.1073/pnas.1400966111
ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
PMCID: PMC4078807
Edited by Maarten J. Chrispeels, University of California, San Diego, La Jolla, CA, and approved May 14, 2014 (received for review January 17, 2014)
Author contributions: Y.B., P.A., N.E.R., C.J.S., H.Q.T., C.T., L.D., S.J.M., M.J.B., and J.R.D. designed research; Y.B., P.A., N.E.R., C.J.S., M.C.T., H.Q.T., C.T., L.D., and J.R.D. performed research; P.L.R. and T.V. contributed new reagents/analytic tools; Y.B., P.A., N.E.R., C.J.S., M.C.T., H.Q.T., C.T., L.D., and J.R.D. analyzed data; and Y.B., N.E.R., C.J.S., S.J.M., M.J.B., and J.R.D. wrote the paper.
1P.A. and N.E.R. contributed equally to this work.
Descrição: The architecture of the branched root system of plants is a major determinant of vigor. Water availability is known to impact root physiology and growth; however, the spatial scale at which this stimulus influences root architecture is poorly understood. Here we reveal that differences in the availability of water across the circumferential axis of the root create spatial cues that determine the position of lateral root branches. We show that roots of several plant species can distinguish between a wet surface and air environments and that this also impacts the patterning of root hairs, anthocyanins, and aerenchyma in a phenomenon we describe as hydropatterning. This environmental response is distinct from a touch response and requires available water to induce lateral roots along a contacted surface. X-ray microscale computed tomography and 3D reconstruction of soil-grown root systems demonstrate that such responses also occur under physiologically relevant conditions. Using early-stage lateral root markers, we show that hydropatterning acts before the initiation stage and likely determines the circumferential position at which lateral root founder cells are specified. Hydropatterning is independent of endogenous abscisic acid signaling, distinguishing it from a classic water-stress response. Higher water availability induces the biosynthesis and transport of the lateral root-inductive signal auxin through local regulation of TRYPTOPHAN AMINOTRANSFERASE OF ARABIDOPSIS 1 and PIN-FORMED 3, both of which are necessary for normal hydropatterning. Our work suggests that water availability is sensed and interpreted at the suborgan level and locally patterns a wide variety of developmental processes in the root.
Editor: United States: National Academy of Sciences
Idioma: Inglês

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Plant roots use a patterning mechanism to position lateral root branches toward available water

Bao, Yun ; Aggarwal, Pooja ; Robbins, Neil E. ; Sturrock, Craig J. ; Thompson, Mark C. ; Tan, Han Qi ; Tham, Cliff ; Duan, Lina ; Rodriguez, Pedro L. ; Vernoux, Teva ; Mooney, Sacha J. ; Bennett, Malcolm J. ; Dinneny, José R.

United States: National Academy of Sciences

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