Cytokinin at the Crossroads of Abiotic Stress Signalling Pathways

Pavlů, Jana; Novák, Jan; Koukalová, Vladěna; Luklová, Markéta; Brzobohatý, Břetislav; Černý, Martin

doi:10.3390/ijms19082450

Cited by 127 publications

(82 citation statements)

References 255 publications

(241 reference statements)

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“…IPT overexpression caused the upregulation of BR (brassinosteroid)-biosynthesis (DWF5 and HYD1) and BR-signaling (BRL3, BRI1, BRH1, BIM1, SERK1) genes under water deficit stress, suggesting a positive correlation between CK and BR [9,60]. Conversely, elevated CK concentration repressed JA (jasmonic acid)-related genes (JAZ12, JAZ1, OPR2 and MES3) [9,60], while high JA concentration in plants attenuated cytokinin signaling by repressing the cytokinin receptor AHK4 and stimulating expression of AHP6, a negative regulator of cytokinin signaling [120]. Contrasting observations were reported while investigating the correlation of IAA with elevated levels of CK.…”

Section: Discussionmentioning

confidence: 99%

The Mode of Cytokinin Functions Assisting Plant Adaptations to Osmotic Stresses

Gujjar

Supaibulwatana

2019

Plants

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Plants respond to abiotic stresses by activating a specific genetic program that supports survival by developing robust adaptive mechanisms. This leads to accelerated senescence and reduced growth, resulting in negative agro-economic impacts on crop productivity. Cytokinins (CKs) customarily regulate various biological processes in plants, including growth and development. In recent years, cytokinins have been implicated in adaptations to osmotic stresses with improved plant growth and yield. Endogenous CK content under osmotic stresses can be enhanced either by transforming plants with a bacterial isopentenyl transferase (IPT) gene under the control of a stress inducible promoter or by exogenous application of synthetic CKs. CKs counteract osmotic stress-induced premature senescence by redistributing soluble sugars and inhibiting the expression of senescence-associated genes. Elevated CK contents under osmotic stress antagonize abscisic acid (ABA) signaling and ABA mediated responses, delay leaf senescence, reduce reactive oxygen species (ROS) damage and lipid peroxidation, improve plant growth, and ameliorate osmotic stress adaptability in plants.

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Section: Discussionmentioning

confidence: 99%

The Mode of Cytokinin Functions Assisting Plant Adaptations to Osmotic Stresses

Gujjar

Supaibulwatana

2019

Plants

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“…CK and GA antagonistically control meristem maintenance and organ development (De Smet et al, 2015; Pavlu et al, 2018; Shani et al, 2006), and their levels are counter-balanced by the feedback regulation of GA biosynthesis in rice (Wu et al, 2016). OsCKX4 , encoding a cytokinin oxidase, is responsible for cytokinin degradation and plays a positive role in crown root formation (Gao et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

“…Ectopic expression of GA2ox6 mutants and PtCYP714A3 led to reduced GA levels and dwarfed plant, but conferred rice with enhanced tolerance to drought and salt stress (Lo et al, 2017; Wang et al, 2016). Unlike GAs, CKs positively regulates plant stress tolerance by enhancing photosynthesis and antioxidant capacities, improving water use efficiency, and modulating growth and development (Pavlu et al, 2018). In rice, CKs could delay dark-induced senescence by maintaining the chlorophyll cycle and photosynthetic stability (Talla et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

OsCYP71D8L as a key regulator involved in growth and stress response by mediating gibberellins and cytokinins homeostasis in rice

Zhou

Xiao

et al. 2019

Preprint

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Phytohormones are pivotal in the regulation of plant growth and development, and acclimation to adverse environments. Multiple cytochrome P450 monooxygenases (CYP450s) are involved in the biosynthesis and catabolism of phytohormones. Here, we reported that a CYP450 member of CYP71 clan, OsCYP71D8L, participated in the control of multiple agronomic traits and abiotic stress responses by affecting gibberellin (GA) and cytokinin (CK) homeostasis in rice. We found that its gain-of-function mutant (cyp71d8l) and transgenic plants overexpressingOsCYP71D8L (OsCYP71D8L-OE) displayed similar phenotypes such as dwarfed plant, reduced panicle length and grain number per panicle. In OsCYP71D8L-OE seedlings, endogenous GAs and CKs was notably decreased and increased as compared with wild type (WT), respectively. Correspondingly, the dwarfed plant and less developed root of cyp71d8l and OsCYP71D8L-OE seedlings could be rescued by exogenous GA3, but more exacerbated by exogenous 6-BA. Importantly, cyp71d8land OsCYP71D8L-OE seedlings maintained high chlorophyll contents and low reactive oxygen species level, and showed significantly enhanced tolerances to drought and high salt compared with WT. Thus, our results suggest that OsCYP71D8L plays roles in regulating rice growth and stress responses by coordinating GAs and CKs homeostasis, and it is useful to engineer stress-tolerant rice.

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“…In the response to biotic stress such as Pseudomonas infection, CK is required for an effective defense regulating the oxidative burst through ARR2 (Arnaud et al, 2017; Choi et al, 2010). CK is known also from other instances to regulate the response to oxidative stress (Pavlů et al, 2018; Cortleven et al, 2019) which is a hallmark of the response to photoperiod stress (Nitschke et al, 2016). We propose that one function of the enhanced CK formation could be to properly respond to oxidative stress caused by PLP treatment (Nitschke et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

Root-derived trans-zeatin cytokinin protects Arabidopsis plants against photoperiod stress

Frank

Cortleven

Schmülling

2020

Preprint

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Running title: Protective role of root-borne cytokinin 1 2 Root-derived trans-zeatin cytokinin protects Arabidopsis plants against photoperiod 3 stress 4 5 ABSTRACT 27 Recently, a novel type of abiotic stress caused by a prolongation of the light period -coined 28 photoperiod stress -has been described in Arabidopsis. During the night after the 29 prolongation of the light period, stress and cell death marker genes are induced. The next day, 30 strongly stressed plants display a reduced photosynthetic efficiency and leaf cells eventually 31 enter programmed cell death. The phytohormone cytokinin (CK) acts as a negative regulator of 32 this photoperiod stress syndrome. In this study, we show that Arabidopsis wild-type plants 33 increase the CK concentration in response to photoperiod stress. Analysis of cytokinin 34 synthesis and transport mutants revealed that root-derived trans-zeatin (tZ)-type CKs protect 35 against photoperiod stress. The CK signaling proteins ARABIDOPSIS HISTIDINE 36 PHOSPHOTRANSFER PROTEIN 2 (AHP2), AHP3 and AHP5 and transcription factors 37 ARABIDOPSIS RESPONSE REGULATOR 2 (ARR2), ARR10 and ARR12 are required for the 38 protective activity of CK. Analysis of higher order B-type arr mutants suggested that a complex 39 regulatory circuit exists in which the loss of ARR10 or ARR12 can rescue the arr2 phenotype. 40 Together the results revealed the role of root-derived CK acting in the shoot through the two-41 component signaling system to protect from the negative consequences of strong photoperiod 42 stress. 43 44 45

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Cytokinin at the Crossroads of Abiotic Stress Signalling Pathways

Cited by 127 publications

References 255 publications

The Mode of Cytokinin Functions Assisting Plant Adaptations to Osmotic Stresses

The Mode of Cytokinin Functions Assisting Plant Adaptations to Osmotic Stresses

OsCYP71D8L as a key regulator involved in growth and stress response by mediating gibberellins and cytokinins homeostasis in rice

Root-derived trans-zeatin cytokinin protects Arabidopsis plants against photoperiod stress

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