Interactions between nitric oxide and plant hormones in aluminum tolerance

He, Hua; He, Long-Fei; Gu, Minghong

doi:10.4161/psb.19312

Cited by 23 publications

(14 citation statements)

References 37 publications

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“…For example, NO may help plant maintain high levels of K + to reduce the toxic effects of high salt, and it may lower plant K + content to retard growth under nonsalinity stresses-i.e., NO may exert different strategies responding to changing conditions to precisely fulfill its roles in plant K + homeostasis. Besides K + , NO, as a multifunctional signaling molecule, also implicates in the regulation of other ions, such as calcium (57), iron (9), cadmium (58), and aluminum (59), to adjust plant growth.…”

Section: Discussionmentioning

confidence: 99%

Nitric oxide negatively regulates AKT1-mediated potassium uptake through modulating vitamin B6 homeostasis in Arabidopsis

Xia

Kong

Xue

et al. 2014

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

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Nitric oxide (NO), an active signaling molecule in plants, is involved in numerous physiological processes and adaptive responses to environmental stresses. Under high-salt conditions, plants accumulate NO quickly, and reorganize Na + and K + contents. However, the molecular connection between NO and ion homeostasis is largely unknown. Here, we report that NO lowers K + channel AKT1-mediated plant K + uptake by modulating vitamin B6 biosynthesis. In a screen for Arabidopsis NO-hypersensitive mutants, we isolated sno1 (sensitive to nitric oxide 1), which is allelic to the previously noted mutant sos4 (salt overly sensitive 4) that has impaired Na + and K + contents and overproduces pyridoxal 5′-phosphate (PLP), an active form of vitamin B6. We showed that NO increased PLP and decreased K + levels in plant. NO induced SNO1 gene expression and enzyme activity, indicating that NO-triggered PLP accumulation mainly occurs through SNO1-mediated vitamin B6 salvage biosynthetic pathway. Furthermore, we demonstrated that PLP significantly repressed the activity of K + channel AKT1 in the Xenopus oocyte system and Arabidopsis root protoplasts. Together, our results suggest that NO decreases K + absorption by promoting the synthesis of vitamin B6 PLP, which further represses the activity of K + channel AKT1 in Arabidopsis. These findings reveal a previously unidentified pivotal role of NO in modulating the homeostasis of vitamin B6 and potassium nutrition in plants, and shed light on the mechanism of NO in plant acclimation to environmental changes.genetic approach | electrophysiological studies | potassium nutrition N itric oxide (NO) acts as a crucial signaling molecule in various physiological processes in plants, such as seed germination and dormancy (1, 2), root development (3), leaf senescence (4, 5), floral transition (6), stomatal movement (7, 8), iron homeostasis (9, 10), and hormone responses (11,12). NO production is altered when plants are subjected to abiotic or biotic stresses (13,14). High salt, a major environmental factor that limits agriculture yield, induces a quick endogenous NO accumulation in plants (15,16), and triggers enhanced Na + influx and reduced K + absorption in the root (17). Both endogenously produced NO and exogenously applied NO have been proposed to enhance plant salt tolerance (18-21) by attenuating high saltinduced increases in the Na + to K + ratio. Genetic analysis showed that K + nutrition, but not Na + , plays critical role in plant salt tolerance (22). However, the molecular basis of NO effect on K + or Na + content is elusive.K + levels in plant tissues are determined by K + uptake and translocation, which are mediated by a large number of transporters and channels. In Arabidopsis, the K + channel AKT1 (23, 24) and K + transporter AtHAK5 (25) are the two major molecular entities responsible for K + absorption from the environment (26-28). AKT1 contributes to K + acquisition over a wide range of external K + concentrations (10 μM-10 mM), whereas AtHAK5 mediates limited uptake capac...

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Section: Discussionmentioning

confidence: 99%

Nitric oxide negatively regulates AKT1-mediated potassium uptake through modulating vitamin B6 homeostasis in Arabidopsis

Xia

Kong

Xue

et al. 2014

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

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“…Specifically, NO appears to be a ubiquitous endogenous mediator involved in a range of processes, including germination, root growth and stomatal closing, as well as in responses to biotic and abiotic stresses (Besson‐Bard et al ., ). Of particular interest to the present review, it is known that NO has important roles in signalling the regulation of cell wall synthesis (Correa‐Aragunde et al ., ; Ye et al ., ) and it has been suggested that NO is important in regulating other phytohormones in Al stress (He et al ., ).…”

Section: Nitric Oxidementioning

confidence: 97%

“…There is evidence that phytohormones play an important role in the expression of Al toxicity and the subsequent responses of the plants to this stress. Whilst brief consideration has been given to the role of phytohormones in Al toxicity elsewhere (He et al ., ; Yuan et al ., ; Matsumoto et al . ; Yang & Horst, ), the present review extends this existing information.…”

Section: Introductionmentioning

confidence: 99%

Role of phytohormones in aluminium rhizotoxicity

Kopittke

2016

Plant Cell & Environment

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Elevated concentrations of soluble aluminium (Al) reduce root growth in acid soils, but much remains unknown regarding the toxicity of this Al as well as the mechanisms by which plants respond. This review examines changes in phytohormones in Al-stressed plants. Al often results in a rapid 'burst' of ethylene in root apical tissues within 15-30 min, with this regulating an increase in auxin. This production of ethylene and auxin seems to be a component of a plant-response to toxic Al, resulting in cell wall modification or regulation of organic acid release. There is also evidence of a role of auxin in the expression of Al toxicity itself, with Al decreasing basipetal transport of auxin, thereby potentially decreasing wall loosening as required for elongation. Increasingly, changes in abscisic acid in root apices also seem to be involved in plant-responses to toxic Al. Changes in cytokinins, gibberellins and jasmonates following exposure to Al are also examined, although little information is available. Finally, although not a phytohormone, concentrations of nitric oxide change rapidly in Al-exposed tissues. The information presented in this review will assist in focusing future research efforts in examining the importance of phytohormones in plant tissues exposed to toxic levels of Al.

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“…Studies revealed that endogenous regulations (e.g., biosynthesis, transport, redistribution, and conjugation of plant hormones) play a crucial role during the acclimation process against stress He et al, 2012a;Wilkinson et al, 2012;Krishnamurthy and Rathinasabapathi, 2013;Srivastava et al, 2013). Besides this, exogenous application of plant hormones has also been reported to enhance stress tolerance in plants affected by heavy metals (Quint and Gray, 2006;Koprivova et al, 2008;Gangwar et al, 2011a,b;Peto et al, 2011;Rubio-Wilhelmi et al, 2011;Claeys et al, 2012;Elobeid et al, 2012;Nam et al, 2012;Zhu et al, 2012;Krishnamurthy and Rathinasabapathi, 2013;Srivastava et al, 2013).…”

Section: Plant Growth Hormonesmentioning

confidence: 99%