Characteristics of a root hair-less line of Arabidopsis thaliana under physiological stresses

Tanaka, Natsuki; Kato, Mariko; Tomioka, Rie; Kurata, Rie; Fukao, Yoichiro; Aoyama, Takashi; Maeshima, Masayoshi

doi:10.1093/jxb/eru014

Cited by 113 publications

(75 citation statements)

References 67 publications

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“…Studies with root hairless mutants in Arabidopsis have indicated that root hairs contribute significantly to phosphorus acquisition and offer plants a competitive advantage under limited phosphorus availability Lynch, 1996, 2001;Brown et al, 2012). The significance of root hairs in nutrient acquisition was recently studied in the root hair-defective transgenic line NR23 of Arabidopsis (Tanaka et al, 2014). Compared with the wild type, NR23 plants exhibited decreased shoot biomass when grown under most nutrient deficiencies tested and accumulated less calcium, potassium, phosphorus, sulfur, boron, copper, and zinc in their shoots.…”

Section: Role Of Root Hairs For Nutrient Acquisitionmentioning

confidence: 99%

Root Nutrient Foraging

2014

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Section: Role Of Root Hairs For Nutrient Acquisitionmentioning

confidence: 99%

Root Nutrient Foraging

2014

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“…The importance of root hairs for water uptake was shown by comparing wild-type Arabidopsis plants with hairless root mutants. Due to the reduced ability of the root hairless mutants to absorb water, they are more sensitive to drought, salinity and heat stress [40]. In barley, root hairs improved root penetration into hard, compact soils, a crucial feature for plant establishment [41].…”

Section: Controlling Water Uptake Through Roots Architecturementioning

confidence: 99%

Improving Plant Water Use Efficiency through Molecular Genetics

et al. 2017

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Improving crop performance under water-limiting conditions is essential for achieving environmentally sustainable food production. This requires significant progress in both the identification and characterization of key genetic and physiological processes involved in water uptake and loss. Plants regulate water uptake and loss through both developmental and environmental responses. These responses include: root morphology and architecture, cuticle development, stomatal development, and guard cell movements in response to the environment. Genes controlling root traits and stomatal development and guard cell movements strongly impact water use efficiency (WUE), and represent the best targets for molecular breeding programs. This article provides an overview of the complex networks of genes involved in water uptake and loss. These traits represent novel opportunities and strategies for genetic improvement of WUE and drought tolerance in crops.

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“…The impaired responses of various root hairless mutants to altered nutrient conditions indicate the necessity for proper adjustment of root hair development for optimum interaction with the environment (Tanaka et al, 2014). Consequently, root hair length and density are constantly optimized to current environmental demands (Kochian, 1995;López-Bucio et al, 2003;Wang et al, 2008;Giehl and von Wirén, 2014).…”

Section: Rsl Genes As Integrators Of Developmental and Environmental mentioning

confidence: 99%

ABA Suppresses Root Hair Growth via the OBP4 Transcriptional Regulator

et al. 2017

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Plants modify organ growth and tune morphogenesis in response to various endogenous and environmental cues. At the cellular level, organ growth is often adjusted by alterations in cell growth, but the molecular mechanisms underlying this control remain poorly understood. In this study, we identify the DNA BINDING WITH ONE FINGER (DOF)-type transcription regulator OBF BINDING PROTEIN4 (OBP4) as a repressor of cell growth. Ectopic expression of OBP4 in Arabidopsis (Arabidopsis thaliana) inhibits cell growth, resulting in severe dwarfism and the repression of genes involved in the regulation of water transport, root hair development, and stress responses. Among the basic helix-loop-helix transcription factors known to control root hair growth, OBP4 binds the ROOT HAIR DEFECTIVE6-LIKE2 (RSL2) promoter to repress its expression. The accumulation of OBP4 proteins is detected in expanding root epidermal cells, and its expression level is increased by the application of abscisic acid (ABA) at concentrations sufficient to inhibit root hair growth. ABA-dependent induction of OBP4 is associated with the reduced expression of RSL2. Furthermore, ectopic expression of OBP4 or loss of RSL2 function results in ABAinsensitive root hair growth. Taken together, our results suggest that OBP4-mediated transcriptional repression of RSL2 contributes to the ABA-dependent inhibition of root hair growth in Arabidopsis.

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Characteristics of a root hair-less line of Arabidopsis thaliana under physiological stresses

Abstract: SummaryRoot hairs of Arabidopsis play significant roles in the absorption of water and several minerals, secretion of acid phosphatases and organic acids, and anchoring of roots.

Cited by 113 publications

References 67 publications

Root Nutrient Foraging

Root Nutrient Foraging

Improving Plant Water Use Efficiency through Molecular Genetics

ABA Suppresses Root Hair Growth via the OBP4 Transcriptional Regulator

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