Knockout of <scp>AtDjB1</scp>, a J‐domain protein from <i>Arabidopsis thaliana</i>, alters plant responses to osmotic stress and abscisic acid

Wang, Xingxing; Jia, Ning; Zhao, Chunlan; Fang, Yu-Lu; Lv, Tingting; Zhou, Wei; Sun, Yanfeng; Li, Bing

doi:10.1111/ppl.12169

Cited by 15 publications

(8 citation statements)

References 94 publications

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“…The model may well have broader applicability then to the heat response only ( Jiang and Zhang, 2002 ; Jammes et al, 2009 ; Bartoli et al, 2013 ; Wang et al, 2014b ; Hossain et al, 2015 ). Not only are ROS accumulation, signaling and scavenging thought to occur and play a role in myriad other stress responses ( Mittler, 2002 ; Hossain et al, 2015 ), but so is HSP activity ( Pastori and Foyer, 2002 ; Banti et al, 2008 ; Pucciariello et al, 2012 ).…”

Section: A Multi-level Interaction Modelmentioning

confidence: 99%

Multi-Level Interactions Between Heat Shock Factors, Heat Shock Proteins, and the Redox System Regulate Acclimation to Heat

et al. 2015

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High temperature has become a global concern because it seriously affects the growth and reproduction of plants. Exposure of plant cells to high temperatures result in cellular damage and can even lead to cell death. Part of the damage can be ascribed to the action of reactive oxygen species (ROS), which accumulate during abiotic stresses such as heat stress. ROS are toxic and can modify other biomacromolecules including membrane lipids, DNA, and proteins. In order to protect the cells, ROS scavenging is essential. In contrast with their inherent harms, ROS also function as signaling molecules, inducing stress tolerance mechanisms. This review examines the evidence for crosstalk between the classical heat stress response, which consists of heat shock factors (HSFs) and heat shock proteins (HSPs), with the ROS network at multiple levels in the heat response process. Heat stimulates HSF activity directly, but also indirectly via ROS. HSFs in turn stimulate the expression of HSP chaperones and also affect ROS scavenger gene expression. In the short term, HSFs repress expression of superoxide dismutase scavenger genes via induction of miRNA398, while they also activate scavenger gene expression and stabilize scavenger protein activity via HSP induction. We propose that these contrasting effects allow for the boosting of the heat stress response at the very onset of the stress, while preventing subsequent oxidative damage. The described model on HSFs, HSPs, ROS, and ROS scavenger interactions seems applicable to responses to stresses other than heat and may explain the phenomenon of crossacclimation.

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Section: A Multi-level Interaction Modelmentioning

confidence: 99%

Multi-Level Interactions Between Heat Shock Factors, Heat Shock Proteins, and the Redox System Regulate Acclimation to Heat

et al. 2015

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“…Such beneficial interactions between chloroplasts and mitochondria have been shown in conditions of high light resulting in photoinhibition where mitochondrial AOX has been shown to be important (Florez‐Sarasa et al , Zhang et al ). Also under drought (Wang and Vanlerberghe , Wang et al ) and low temperature (Hurry et al ) mitochondrial activities contribute to optimal cellular photosynthesis.…”

Section: Flexible Adjustment Of the Cytosolic Atp/adp Ratio By Mitochmentioning

confidence: 99%

The origin of cytosolic ATP in photosynthetic cells

Gardeström

Igamberdiev

2016

Physiologia Plantarum

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In photosynthetically active cells, both chloroplasts and mitochondria have the capacity to produce ATP via photophosphorylation and oxidative phosphorylation, respectively. Thus, theoretically, both organelles could provide ATP for the cytosol, but the extent, to which they actually do this, and how the process is regulated, both remain unclear. Most of the evidence discussed comes from experiments with rapid fractionation of isolated protoplasts subjected to different treatments in combination with application of specific inhibitors. The results obtained indicate that, under conditions where ATP demand for photosynthetic CO2 fixation is sufficiently high, the mitochondria supply the bulk of ATP for the cytosol. In contrast, under stress conditions where CO2 fixation is severely limited, ATP will build up in chloroplasts and it can then be exported to the cytosol, by metabolite shuttle mechanisms. Thus, depending on the conditions, either mitochondria or chloroplasts can supply the bulk of ATP for the cytosol. This supply of ATP is discussed in relation to the idea that mitochondrial functions may be tuned to provide an optimal environment for the chloroplast. By balancing cellular redox states, mitochondria can contribute to an optimal photosynthetic capacity.

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“…DJLD5/EIP9 is localized in both cytoplasm and nucleus, and interacts with EMF1 to implicate in flowering time control (Park et al 2011 (Park and Kim 2014). Additionally, the expression of DJC20/AtJ1 was induced by salinity, dehydration and abscisic acid (ABA), and DJC20/AtJ1 also play a crucial role in stress response, such as thermotolerance, oxidative and osmotic stress (Park and Kim 2014;Wang et al 2014b;Zhou et al 2012). DJA3/GFA2 localized in the mitochondrial matrix is an ortholog of the yeast mitochondrial J protein …”

Section: Multigene Clades: Clade I~iimentioning

confidence: 99%

Phylogeny-dominant classification of J-proteins inArabidopsis thalianaandBrassica oleracea

Zhang

Qiu

et al. 2018

Genome

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Hsp40s or DnaJ/J-proteins are evolutionarily conserved in all organisms as co-chaperones of molecular chaperone HSP70s that mainly participate in maintaining cellular protein homeostasis, such as protein folding, assembly, stabilization, and translocation under normal conditions as well as refolding and degradation under environmental stresses. It has been reported that Arabidopsis J-proteins are classified into four classes (types A-D) according to domain organization, but their phylogenetic relationships are unknown. Here, we identified 129 J-proteins in the world-wide popular vegetable Brassica oleracea, a close relative of the model plant Arabidopsis, and also revised the information of Arabidopsis J-proteins based on the latest online bioresources. According to phylogenetic analysis with domain organization and gene structure as references, the J-proteins from Arabidopsis and B. oleracea were classified into 15 main clades (I-XV) separated by a number of undefined small branches with remote relationship. Based on the number of members, they respectively belong to multigene clades, oligo-gene clades, and mono-gene clades. The J-protein genes from different clades may function together or separately to constitute a complicated regulatory network. This study provides a constructive viewpoint for J-protein classification and an informative platform for further functional dissection and resistant genes discovery related to genetic improvement of crop plants.

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Knockout of AtDjB1, a J‐domain protein from Arabidopsis thaliana, alters plant responses to osmotic stress and abscisic acid

Cited by 15 publications

References 94 publications

Multi-Level Interactions Between Heat Shock Factors, Heat Shock Proteins, and the Redox System Regulate Acclimation to Heat

Multi-Level Interactions Between Heat Shock Factors, Heat Shock Proteins, and the Redox System Regulate Acclimation to Heat

The origin of cytosolic ATP in photosynthetic cells

Phylogeny-dominant classification of J-proteins inArabidopsis thalianaandBrassica oleracea

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