Inhibition of root meristem growth by cadmium involves nitric oxide‐mediated repression of auxin accumulation and signalling in Arabidopsis

Yuan, Hongmei; Huang, Xi

doi:10.1111/pce.12597

Cited by 194 publications

(160 citation statements)

References 97 publications

(114 reference statements)

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“…Changes in Aux/IAA stability and, subsequently, the auxin perception level appear to represent a general strategy by which plants interplay with phytohormones and respond to environmental cues (Yuan et al, 2013;Bailly et al, 2014;Katz et al, 2015;Liu et al, 2015;Yuan and Huang, 2016). Treatment with SA reduces auxin responses by stabilizing Aux/IAA proteins (Wang et al, 2007).…”

Section: Discussion Mhpp Affects Root System Development By Modulatinmentioning

confidence: 99%

“…The above results show that PAT is required for the MHPP-induced inhibition of PR growth. PAT is mediated by auxin influx carriers in the AUX/LAX family and efflux carriers in the PIN family (Péret et al, 2012;Yuan et al, 2014;Yuan and Huang, 2016). Thus, we examined whether MHPP treatment also affects the expression of auxin carriers in roots.…”

Section: Auxin Is Involved In the Mhpp-mediated Inhibition Of Pr Merimentioning

confidence: 99%

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The Nitrification Inhibitor Methyl 3-(4-Hydroxyphenyl)Propionate Modulates Root Development by Interfering with Auxin Signaling via the NO/ROS Pathway

et al. 2016

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Methyl 3-(4-hydroxyphenyl)propionate (MHPP) is a root exudate that functions as a nitrification inhibitor and as a modulator of the root system architecture (RSA) by inhibiting primary root (PR) elongation and promoting lateral root formation. However, the mechanism underlying MHPP-mediated modulation of the RSA remains unclear. Here, we report that MHPP inhibits PR elongation in Arabidopsis (Arabidopsis thaliana) by elevating the levels of auxin expression and signaling. MHPP induces an increase in auxin levels by up-regulating auxin biosynthesis, altering the expression of auxin carriers, and promoting the degradation of the auxin/indole-3-acetic acid family of transcriptional repressors. We found that MHPP-induced nitric oxide (NO) production promoted reactive oxygen species (ROS) accumulation in root tips. Suppressing the accumulation of NO or ROS alleviated the inhibitory effect of MHPP on PR elongation by weakening auxin responses and perception and by affecting meristematic cell division potential. Genetic analysis supported the phenotype described above. Taken together, our results indicate that MHPP modulates RSA remodeling via the NO/ROS-mediated auxin response pathway in Arabidopsis. Our study also revealed that MHPP significantly induced the accumulation of glucosinolates in roots, suggesting the diverse functions of MHPP in modulating plant growth, development, and stress tolerance in plants.

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Section: Discussion Mhpp Affects Root System Development By Modulatinmentioning

confidence: 99%

Section: Auxin Is Involved In the Mhpp-mediated Inhibition Of Pr Merimentioning

confidence: 99%

The Nitrification Inhibitor Methyl 3-(4-Hydroxyphenyl)Propionate Modulates Root Development by Interfering with Auxin Signaling via the NO/ROS Pathway

et al. 2016

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“…The zone between two white arrows in images include both the apical meristem and the transition zone (Verbelen et al, 2006; Baluska et al, 2010). Root meristem size was quantified as previously described (Liu et al, 2015; Yuan and Huang, 2016). Results presented are average values of more than 30 seedlings per treatment from three independent experiments.…”

Section: Methodsmentioning

confidence: 99%

Melatonin Regulates Root Meristem by Repressing Auxin Synthesis and Polar Auxin Transport in Arabidopsis

et al. 2016

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Melatonin (N-acetyl-5-methoxytryptamine) plays important roles in regulating both biotic and abiotic stress tolerance, biological rhythms, plant growth and development. Sharing the same substrate (tryptophan) for the biosynthesis, melatonin and auxin also have similar effects in plant development. However, the specific function of melatonin in modulating plant root growth and the relationship between melatonin and auxin as well as underlying mechanisms are still unclear. In this study, we found high concentration of melatonin remarkably inhibited root growth in Arabidopsis by reducing root meristem size. Further studies showed that melatonin negatively regulated auxin biosynthesis, the expression of PINFORMED (PIN) proteins as well as auxin response in Arabidopsis. Moreover, the root growth of the triple mutant pin1pin3pin7 was more tolerant than that of wild-type in response to melatonin treatment, suggesting the essential role of PIN1/3/7 in melatonin-mediated root growth. Combination treatment of melatonin and 5-Triiodobenzoic acid (TIBA) did not enhance melatonin-mediated reduction of root meristem size, indicating that polar auxin transport (PAT) may be necessary for the regulation of root meristem size by melatonin treatment. Taken together, this study indicates that melatonin regulates root growth in Arabidopsis, through auxin synthesis and polar auxin transport, at least partially.

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“…Exogenous Ca 2+ can ameliorate Cd’s inhibition of Arabidopsis root growth by counteracting effects of NO on auxin homeostasis (Hu et al, 2013; Li P. et al, 2016; Yuan and Huang, 2016). Cd also interferes with auxin homeostasis in barley roots (Zelinova et al, 2015).…”

Section: Heavy Metal Stress Has the Capacity To Distort Ca2+ Signalingmentioning

confidence: 99%

Calcium-Mediated Abiotic Stress Signaling in Roots

et al. 2016

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Roots are subjected to a range of abiotic stresses as they forage for water and nutrients. Cytosolic free calcium is a common second messenger in the signaling of abiotic stress. In addition, roots take up calcium both as a nutrient and to stimulate exocytosis in growth. For calcium to fulfill its multiple roles must require strict spatio-temporal regulation of its uptake and efflux across the plasma membrane, its buffering in the cytosol and its sequestration or release from internal stores. This prompts the question of how specificity of signaling output can be achieved against the background of calcium’s other uses. Threats to agriculture such as salinity, water availability and hypoxia are signaled through calcium. Nutrient deficiency is also emerging as a stress that is signaled through cytosolic free calcium, with progress in potassium, nitrate and boron deficiency signaling now being made. Heavy metals have the capacity to trigger or modulate root calcium signaling depending on their dose and their capacity to catalyze production of hydroxyl radicals. Mechanical stress and cold stress can both trigger an increase in root cytosolic free calcium, with the possibility of membrane deformation playing a part in initiating the calcium signal. This review addresses progress in identifying the calcium transporting proteins (particularly channels such as annexins and cyclic nucleotide-gated channels) that effect stress-induced calcium increases in roots and explores links to reactive oxygen species, lipid signaling, and the unfolded protein response.

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Inhibition of root meristem growth by cadmium involves nitric oxide‐mediated repression of auxin accumulation and signalling in Arabidopsis

Cited by 194 publications

References 97 publications

The Nitrification Inhibitor Methyl 3-(4-Hydroxyphenyl)Propionate Modulates Root Development by Interfering with Auxin Signaling via the NO/ROS Pathway

The Nitrification Inhibitor Methyl 3-(4-Hydroxyphenyl)Propionate Modulates Root Development by Interfering with Auxin Signaling via the NO/ROS Pathway

Melatonin Regulates Root Meristem by Repressing Auxin Synthesis and Polar Auxin Transport in Arabidopsis

Calcium-Mediated Abiotic Stress Signaling in Roots

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