Repression of early lateral root initiation events by transient water deficit in barley and maize

Babé, Aurelie; Lavigne, Tristan; Séverin, Jean-Philippe; Nagel, Kerstin; Walter, Achim; Chaumont, François; Batoko, Henri; Beeckman, Tom

doi:10.1098/rstb.2011.0240

Cited by 39 publications

(27 citation statements)

References 37 publications

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“…Previous work has shown that under water-limiting conditions, LR development is strongly suppressed (16). Severe water limitation induces ABA signaling, which is known to inhibit the development of LRs (17).…”

Section: Patterning Of Root Tissues Is Determined By the Local Availamentioning

confidence: 99%

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

Bao

Aggarwal

Robbins

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

339

262

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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 TRYPTO-PHAN 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. moisture regulation | root development | root system architecture | adaptive root response | auxin-regulated root patterning

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Section: Patterning Of Root Tissues Is Determined By the Local Availamentioning

confidence: 99%

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

Bao

Aggarwal

Robbins

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

339

262

View full text Add to dashboard Cite

show abstract

“…Research on Arabidopsis and a few model crops has led to substantial knowledge of the molecular and cell biology of lateral root initiation and growth [19,20] (see also [21][22][23][24]). Since lateral roots represent the most common type of root branching and, in most cases, the majority of root length, these advances portend applied approaches to harness these pathways to develop improved cultivars.…”

Section: Lateral Roots and Root System Architecturementioning

confidence: 99%

New roots for agriculture: exploiting the root phenome

Lynch

Brown

2012

Phil. Trans. R. Soc. B

265

187

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Recent advances in root biology are making it possible to genetically design root systems with enhanced soil exploration and resource capture. These cultivars would have substantial value for improving food security in developing nations, where yields are limited by drought and low soil fertility, and would enhance the sustainability of intensive agriculture. Many of the phenes controlling soil resource capture are related to root architecture. We propose that a better understanding of the root phenome is needed to effectively translate genetic advances into improved crop cultivars. Elementary, unique root phenes need to be identified. We need to understand the 'fitness landscape' for these phenes: how they affect crop performance in an array of environments and phenotypes. Finally, we need to develop methods to measure phene expression rapidly and economically without artefacts. These challenges, especially mapping the fitness landscape, are non-trivial, and may warrant new research and training modalities.

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“…The architecture of the root system, that is its three-dimensional shape, largely derives from the distribution and diversity of individual root apical meristems [2], which continuously sense and adjust their growth according to their local environment [3]. In addition, the formation of lateral roots also contributes strongly in shaping root systems and impacts soil resources capture [4].…”

Section: Introductionmentioning

confidence: 99%

Physical root–soil interactions

2017

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Abstract. Plant root system development is highly modulated by the physical properties of the soil and especially by its mechanical resistance to penetration. The interplay between the mechanical stresses exerted by the soil and root growth is of particular interest for many communities, in agronomy and soil science as well as in biomechanics and plant morphogenesis. In contrast to aerial organs, roots apices must exert a growth pressure to penetrate strong soils and reorient their growth trajectory to cope with obstacles like stones or hardpans or to follow the tortuous paths of the soil porosity. In this review, we present the main macroscopic investigations of soil-root physical interactions in the field and combine them with simple mechanistic modeling derived from model experiments at the scale of the individual root apex.2

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Repression of early lateral root initiation events by transient water deficit in barley and maize

Cited by 39 publications

References 37 publications

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

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

New roots for agriculture: exploiting the root phenome

Physical root–soil interactions

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