A tale of many families: calcium channels in plant immunity

Xu, Guangyuan; Moeder, Wolfgang; Yoshioka, Keiko; Shan, Libo

doi:10.1093/plcell/koac033

Cited by 52 publications

(41 citation statements)

References 180 publications

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“…Mutant plants with impaired HKT1, NHX1, or SOS3 could be applied to confirm the involvement of these genes in strain K-induced salt tolerance. Moreover, salt-tolerant maize inbred line exerted faster induction of genes related to Ca 2+ transport ( Gao et al, 2016 ), thus whether strain K could also upregulate these genes is worth studying since Ca 2+ is an essential messenger for early cellular responses to various stresses, including salinity ( Xu et al, 2022 ).…”

Section: Discussionmentioning

confidence: 99%

Mucilaginibacter sp. K Improves Growth and Induces Salt Tolerance in Nonhost Plants via Multilevel Mechanisms

Fan

Smith

2022

Front. Plant Sci.

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Soil salinity negatively modulates plant growth and development, contributing to severe decreases in the growth and production of crops. Mucilaginibacter sp. K is a root endophytic bacterium that was previously reported by our laboratory to stimulate growth and confer salt tolerance in Arabidopsis (Arabidopsis thaliana). The main purpose of the present study is to elucidate the physiological and molecular machinery responsible for the prospective salt tolerance as imparted by Mucilaginibacter sp. K. We first report that auxin, gibberellin, and MPK6 signalings were required for strain K-induced growth promotion and salt tolerance in Arabidopsis. Then, this strain was assessed as a remediation strategy to improve maize performance under salinity stress. Under normal growth conditions, the seed vigor index, nitrogen content, and plant growth were significantly improved in maize. After NaCl exposure, strain K significantly promoted the growth of maize seedlings, ameliorated decline in chlorophyll content and reduced accretion of MDA and ROS compared with the control. The possible mechanisms involved in salt resistance in maize could be the improved activities of SOD and POD (antioxidative system) and SPS (sucrose biosynthesis), upregulated content of total soluble sugar and ABA, and reduced Na+ accumulation. These physiological changes were then confirmed by induced gene expression for ion transportation, photosynthesis, ABA biosynthesis, and carbon metabolism. In summary, these results suggest that strain K promotes plant growth through increases in photosynthesis and auxin- and MPK6-dependent pathways; it also bestows salt resistance on plants through protection against oxidative toxicity, Na+ imbalance, and osmotic stress, along with the activation of auxin-, gibberellin-, and MPK6-dependent signaling pathways. This is the first detailed report of maize growth promotion by a Mucilaginibacter sp. strain from wild plant. This strain could be used as a favorable biofertilizer and a salinity stress alleviator for maize, with further ascertainment as to its reliability of performance under field conditions and in the presence of salt stress.

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Section: Discussionmentioning

confidence: 99%

Mucilaginibacter sp. K Improves Growth and Induces Salt Tolerance in Nonhost Plants via Multilevel Mechanisms

Fan

Smith

2022

Front. Plant Sci.

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“…2; Jacob et al ., 2021; Saile et al ., 2021). Ca 2+ plays important signalling roles in plant defence, and misregulation of Ca 2+ influx in plant cells can induce HR cell death and auto‐immunity (Wang et al ., 2019b; Thor et al ., 2020; Tian et al ., 2020; Ren et al ., 2021; Kim et al ., 2022; Xu et al ., 2022). The activated Nicotiana benthamiana ( Nb ) helpers NRC2 and NRC4 also form homo‐oligomers and dynamically reorganise into plasma‐membrane localised punctate structures upon sensor activation (Adachi et al ., 2019a; Duggan et al ., 2021; Ahn et al ., 2022; Contreras et al ., 2022).…”

Section: Plant Immunity Relies On Nonself and Modified‐self Recogniti...mentioning

confidence: 99%

NLR we there yet? Nucleocytoplasmic coordination of NLR‐mediated immunity

Lüdke¹,

Yan²,

Rohmann³

et al. 2022

New Phytologist

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Plant intracellular nucleotide-binding leucine-rich repeat immune receptors (NLRs) perceive the activity of pathogen-secreted effector molecules that, when undetected, promote colonisation of hosts. Signalling from activated NLRs converges with and potentiates downstream responses from activated pattern recognition receptors (PRRs) that sense microbial signatures at the cell surface. Efficient signalling of both receptor branches relies on the host cell nucleus as an integration point for transcriptional reprogramming, and on the macromolecular transport processes that mediate the communication between cytoplasm and nucleoplasm. Studies on nuclear pore complexes (NPCs), the nucleoporin proteins (NUPs) that compose NPCs, and nuclear transport machinery constituents that control nucleocytoplasmic transport, have revealed that they play important roles in regulating plant immune responses. Here, we discuss the contributions of nucleoporins and nuclear transport receptor (NTR)-mediated signal transduction in plant immunity with an emphasis on NLR immune signalling across the nuclear compartment boundary and within the nucleus. We also highlight and discuss cytoplasmic and nuclear functions of NLRs and their signalling partners and further consider the potential implications of NLR activation and resistosome formation in both cellular compartments for mediating plant pathogen resistance and programmed host cell death.

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“…In addition to the apoplast, internal cellular compartments such as the vacuole contribute to the rise in [Ca 2+ ] cyt ( Xu et al, 2022 ). In the vacuolar membrane, T WO- P ORE C HANNEL (TPC) functions as a nonselective cation channel co-regulated by voltage and Ca 2+ , and generates a slow vacuolar current ( Furuichi et al, 2001 ; Ye et al, 2021 ).…”

Section: Ca 2+ Influxmentioning

confidence: 99%

“…However, in a later study, Ca 2+ responses in AtTPC1 -overexpressing Arabidopsis and attpc1-2 knockout mutants did not display any alteration in the stimulus-induced Ca 2+ signals including abiotic stresses and PAMPs, elf18 and flg22 ( Ranf et al, 2008 ). Therefore, it is possible that AtTPC1 is not a major player in the defense response, at least in Arabidopsis ( Moeder et al, 2019 ; Xu et al, 2022 ). AtTPC1 is also known to be involved in the systemic spread of both the wound- and NaCl-driven systemic [Ca 2+ ] cyt increases ( Choi et al, 2014 , 2017 ; Kiep et al, 2015 ).…”

Section: Ca 2+ Influxmentioning

confidence: 99%

Calcium channels and transporters: Roles in response to biotic and abiotic stresses

Park

Shin²

2022

Front. Plant Sci.

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Calcium (Ca2+) serves as a ubiquitous second messenger by mediating various signaling pathways and responding to numerous environmental conditions in eukaryotes. Therefore, plant cells have developed complex mechanisms of Ca2+ communication across the membrane, receiving the message from their surroundings and transducing the information into cells and organelles. A wide range of biotic and abiotic stresses cause the increase in [Ca2+]cyt as a result of the Ca2+ influx permitted by membrane-localized Ca2+ permeable cation channels such as CYCLIC NUCLEOTIDE-GATE CHANNELs (CNGCs), and voltage-dependent HYPERPOLARIZATION-ACTIVATED CALCIUM2+ PERMEABLE CHANNELs (HACCs), as well as GLUTAMATE RECEPTOR-LIKE RECEPTORs (GLRs) and TWO-PORE CHANNELs (TPCs). Recently, resistosomes formed by some NUCLEOTIDE-BINDING LEUCINE-RICH REPEAT RECEPTORs (NLRs) are also proposed as a new type of Ca2+ permeable cation channels. On the contrary, some Ca2+ transporting membrane proteins, mainly Ca2+-ATPase and Ca2+/H+ exchangers, are involved in Ca2+ efflux for removal of the excessive [Ca2+]cyt in order to maintain the Ca2+ homeostasis in cells. The Ca2+ efflux mechanisms mediate the wide ranges of cellular activities responding to external and internal stimuli. In this review, we will summarize and discuss the recent discoveries of various membrane proteins involved in Ca2+ influx and efflux which play an essential role in fine-tuning the processing of information for plant responses to abiotic and biotic stresses.

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A tale of many families: calcium channels in plant immunity

Cited by 52 publications

References 180 publications

Mucilaginibacter sp. K Improves Growth and Induces Salt Tolerance in Nonhost Plants via Multilevel Mechanisms

Mucilaginibacter sp. K Improves Growth and Induces Salt Tolerance in Nonhost Plants via Multilevel Mechanisms

NLR we there yet? Nucleocytoplasmic coordination of NLR‐mediated immunity

Calcium channels and transporters: Roles in response to biotic and abiotic stresses

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