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

Wang, Qiannan; An, Bang; Wei, Yunxie; Reíter, Russel J.; Hong, Shi; Luo, Hongli; He, Chaozu

doi:10.3389/fpls.2016.01882

Cited by 138 publications

(140 citation statements)

References 77 publications

(99 reference statements)

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“…The beneficial effects of MT have been proved for the improvement of several stages of the plant life cycle, such as, germination (Aguilera et al, 2015), cell division (Park and Back, 2012), root development (Passaia et al, 2014; Wang Q. N. et al, 2016), leaf senescence (Lee and Back, 2017), and crop production (Wei et al, 2014). In addition, it has been proved that MT efficiently regulates antioxidant defense systems (Szafrańska et al, 2016), increases photosynthetic efficiency (Zheng et al, 2017), reduces chlorophyll degradation, and delays leaf senescence (Liang et al, 2015) under abiotic stresses.…”

Section: Introductionmentioning

confidence: 99%

Melatonin Has the Potential to Alleviate Cinnamic Acid Stress in Cucumber Seedlings

Yang

Tian

et al. 2017

Front. Plant Sci.

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Cinnamic acid (CA), which is a well-known major autotoxin secreted by the roots in cucumber continuous cropping, has been proven to exhibit inhibitory regulation of plant morphogenesis and development. Melatonin (MT) has been recently demonstrated to play important roles in alleviating plant abiotic stresses. To investigate whether MT supplementation could improve cucumber seedling growth under CA stress, we treated cucumber seeds and seedlings with/without MT under CA- or non-stress conditions, and then tested their effects on cucumber seedling growth, morphology, nutrient element content, and plant hormone. Overall, 10 μM MT best rescued cucumber seedling growth under 0.4 mM CA stress. MT was found to alleviate CA-stressed seedling growth by increasing the growth rates of cotyledons and leaves and by stimulating lateral root growth. Additionally, MT increased the allocation of newly gained dry weight in roots and improved the tolerance of cucumber seedlings to CA stress by altering the nutrient elements and hormone contents of the whole plant. These results strongly suggest that the application of MT can effectively improve cucumber seedling tolerance to CA stress through the perception and integration of morphology, nutrient element content and plant hormone signaling crosstalk.

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Section: Introductionmentioning

confidence: 99%

Melatonin Has the Potential to Alleviate Cinnamic Acid Stress in Cucumber Seedlings

Yang

Tian

et al. 2017

Front. Plant Sci.

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“…Based on previously published data, high concentration of melatonin causes lower endogenous IAA levels in Arabidopsis . To investigate the possible involvement of ZAT6 in melatonin‐mediated IAA accumulation in Arabidopsis , we compared the endogenous IAA levels of WT and knockdown plants in response to melatonin treatment.…”

Section: Resultsmentioning

confidence: 99%

“…IAA content was extracted from 0.2 g of 10‐day‐old Arabidopsis seedlings. The endogenous IAA was purified and quantified as previously described …”

Section: Methodsmentioning

confidence: 99%

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Zinc finger of Arabidopsis thaliana 6 is involved in melatonin‐mediated auxin signaling through interacting INDETERMINATE DOMAIN15 and INDOLE‐3‐ACETIC ACID 17

Hong

ShengMin

Lin

et al. 2018

Journal of Pineal Research

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Although accumulating evidence demonstrates the cross talk between melatonin and auxin as derivatives of tryptophan, the underlying signaling events remain unclear. In this study, we found that melatonin and auxin mediated the transcriptional levels of zinc finger of Arabidopsis thaliana (ZAT6) in a mutually antagonistic manner. ZAT6 negatively modulated the endogenous auxin level, and ZAT6 knockdown plants were less sensitive to melatonin-regulated auxin biosynthesis, indicating its involvement in melatonin-mediated auxin accumulation. Additionally, the identification of INDETERMINATE DOMAIN15 (IDD15) and INDOLE-3-ACETIC ACID 17 (IAA17) in Arabidopsis that interacted with ZAT6 in vivo provided new insight of ZAT6-mediated auxin signaling. Further investigation showed that ZAT6 repressed the transcription activation of IDD15 on the YUC2 promoter, while ZAT6 inhibited the interaction of TRANSPORT INHIBITOR RESPONSE 1 (TIR1) and IAA17 through competitively binding to IAA17. Thus, both auxin synthesis and the auxin response were negatively modulated by ZAT6. Taken together, ZAT6 is involved in melatonin-mediated auxin signaling through forming an interacting complex of auxin signaling pathway in Arabidopsis.

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“…In addition to its functions in regulating stress responses [6,33,35,69], melatonin was also proven to be involved in the regulation of plant growth [31]. We have found that high dose of melatonin inhibited the root growth in Arabidopsis seedlings and suppressed the floral transition in Arabidopsis in our previous studies [23,24]. Consistently, it has been reported that 1 mM melatonin treatment of four-week-old detached Arabidopsis leaves caused increased oxidative stress resistance [15].…”

Section: Discussionmentioning

confidence: 99%

High Concentration of Melatonin Regulates Leaf Development by Suppressing Cell Proliferation and Endoreduplication in Arabidopsis

Wang

Hong

et al. 2017

IJMS

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N-acetyl-5-methoxytryptamine (Melatonin), as a crucial messenger in plants, functions in adjusting biological rhythms, stress tolerance, plant growth and development. Several studies have shown the retardation effect of exogenous melatonin treatment on plant growth and development. However, the in vivo role of melatonin in regulating plant leaf growth and the underlying mechanism are still unclear. In this study, we found that high concentration of melatonin suppressed leaf growth in Arabidopsis by reducing both cell size and cell number. Further kinetic analysis of the fifth leaves showed that melatonin remarkably inhibited cell division rate. Additionally, flow cytometic analysis indicated that melatonin negatively regulated endoreduplication during leaf development. Consistently, the expression analysis revealed that melatonin regulated the transcriptional levels of key genes of cell cycle and ribosome. Taken together, this study suggests that high concentration of melatonin negatively regulated the leaf growth and development in Arabidopsis, through modulation of endoreduplication and the transcripts of cell cycle and ribosomal key genes.

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

Cited by 138 publications

References 77 publications

Melatonin Has the Potential to Alleviate Cinnamic Acid Stress in Cucumber Seedlings

Melatonin Has the Potential to Alleviate Cinnamic Acid Stress in Cucumber Seedlings

Zinc finger of Arabidopsis thaliana 6 is involved in melatonin‐mediated auxin signaling through interacting INDETERMINATE DOMAIN15 and INDOLE‐3‐ACETIC ACID 17

High Concentration of Melatonin Regulates Leaf Development by Suppressing Cell Proliferation and Endoreduplication in Arabidopsis

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