Interaction between salt and heat stress: when two wrongs make a right

Rosales, Miguel A.

doi:10.1111/pce.12229

Cited by 19 publications

(16 citation statements)

References 15 publications

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“…In natural conditions, plants are routinely subjected to a combination of different abiotic stresses, such as the combination of drought, heat, and salinity stresses (Sewelam et al, 2014 ). The response of plants to a combination of different abiotic stresses cannot be directly extrapolated from the response of plants to each of the different stresses applied individually, therefore it is crucial to characterize the acclimation responses of plants to a combination of abiotic stresses and identify multiple stress responsive genes (Mittler, 2006 ; Colmenero-Flores and Rosales, 2014 ). Comprehensive characterization of multifunctional HSFs will provide the basis for investigating their functions in plant abiotic stress responses.…”

Section: Introductionmentioning

confidence: 99%

The Plant Heat Stress Transcription Factors (HSFs): Structure, Regulation, and Function in Response to Abiotic Stresses

et al. 2016

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Abiotic stresses such as high temperature, salinity, and drought adversely affect the survival, growth, and reproduction of plants. Plants respond to such unfavorable changes through developmental, physiological, and biochemical ways, and these responses require expression of stress-responsive genes, which are regulated by a network of transcription factors (TFs), including heat stress transcription factors (HSFs). HSFs play a crucial role in plants response to several abiotic stresses by regulating the expression of stress-responsive genes, such as heat shock proteins (Hsps). In this review, we describe the conserved structure of plant HSFs, the identification of HSF gene families from various plant species, their expression profiling under abiotic stress conditions, regulation at different levels and function in abiotic stresses. Despite plant HSFs share highly conserved structure, their remarkable diversification across plants reflects their numerous functions as well as their integration into the complex stress signaling and response networks, which can be employed in crop improvement strategies via biotechnological intervention.

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Section: Introductionmentioning

confidence: 99%

The Plant Heat Stress Transcription Factors (HSFs): Structure, Regulation, and Function in Response to Abiotic Stresses

et al. 2016

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“…In nature, several stress conditions often occur simultaneously (31). We tested the circadian rhythms of hsfB2b-1 and HsfB2b-ox seedlings under the combination of salt and higher temperature (27°C).…”

Section: Significancementioning

confidence: 99%

HsfB2b-mediated repression ofPRR7directs abiotic stress responses of the circadian clock

Kolmos

Chow

Pruneda‐Paz

et al. 2014

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

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The circadian clock perceives environmental signals to reset to local time, but the underlying molecular mechanisms are not well understood. Here we present data revealing that a member of the heat shock factor (Hsf) family is involved in the input pathway to the plant circadian clock. Using the yeast one-hybrid approach, we isolated several Hsfs, including HEAT SHOCK FACTOR B2b (HsfB2b), a transcriptional repressor that binds the promoter of PSEUDO RESPONSE REGULATOR 7 (PRR7) at a conserved binding site. The constitutive expression of HsfB2b leads to severely reduced levels of the PRR7 transcript and late flowering and elongated hypocotyls. HsfB2b function is important during heat and salt stress because HsfB2b overexpression sustains circadian rhythms, and the hsfB2b mutant has a short circadian period under these conditions. HsfB2b is also involved in the regulation of hypocotyl growth under warm, short days. Our findings highlight the role of the circadian clock as an integrator of ambient abiotic stress signals important for the growth and fitness of plants.circadian clock | Hsf | heat compensation | salt tolerance T he circadian clock is an endogenous timing mechanism that ensures that daily rhythmic processes are synchronized with the environment. The circadian oscillator runs with a period of ∼24 h. It entrains to environmental signals, such as light and temperature, and in this way is able to anticipate daily environmental changes (1). Molecular genetics and modeling have revealed that the circadian system comprises several interconnected feedback loops involving multiple phase-specific gene products (2).In the model plant Arabidopsis, the morning feedback loops are composed of the major oscillator proteins CIRCADIAN CLOCK ASSOCIATED 1 (CCA1) and LATE ELONGATED HYPOCOTYL (LHY), which peak in abundance at dawn and activate the expression of early-late morning genes PSEUDO RESPONSE REGULATOR 9 (PRR9) and PRR7 (3). Pseudoresponse regulator (PRR) proteins are transcriptional repressors, and PRR9 and PRR7 close the morning loops by binding to the CCA1 and LHY promoters (4). The transcription of PRR9 is acutely activated by light, a feature that is not shared by PRR7 (3, 5). Disruption of either locus results in a mild clock phenotype, including an increased clock period of ∼1 h and an elongated hypocotyl (6-8). The double loss-of-function mutant exhibits a strong synergistic phenotype with free-running period lengths of up to 35 h and loss of temperature entrainment and compensation, indicating overlapping roles for PRR9 and PRR7 (3, 9, 10).The ambient environment influences the circadian clock in a number of different ways. Although the most well-studied input cue is light, temperature is a major zeitgeber as well (11). Brief pulses (from minutes to hours, depending on the intensity) result in acute responses from the clock. Importantly, the severity of such responses is time-dependent and gated by the oscillator (12-14). Longer durations of zeitgeber change can function as an entrainment signal and general...

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“…Studying abiotic stress individually is valuable, but it can be misleading because plant responses to combinations of abiotic stress are different from those of each individual stress (Suzuki et al, 2014;Colmenero-Flores and Rosales, 2014). In this study, we compared the expression pattern of some stress-related genes in Lluteño maize, a landrace adapted to soil and water with high salinity and B concentration, in response to salt, B and combined stresses.…”

Section: Discussionmentioning

confidence: 99%

“…In recent decades, several agronomic and physiological studies have focused on the responses of plants to different combinations of environmental stresses (Suzuki et al, 2014 and references therein). These studies have revealed that the response of plants to combination of different abiotic stresses cannot be directly extrapolated from the response of plants to each stress applied individually (Suzuki et al, 2014;Colmenero-Flores, 2014).…”

Section: Introductionmentioning

confidence: 99%

Untitled

2018

Plant Omics

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To understand the molecular stress response in maize plants to high salt and boron (B) stress, we focused on the transcript accumulation of six stress-related genes in Lluteño maize, a sweet corn landrace from the Lluta valley (northern Chile). This landrace is tolerant to salt and B stress. A randomized complete block design with four replications was used. Seedlings of Lluteño maize and maize hybrid B73 were exposed to 150 mM NaCl and 20 ppm B in nutrient solution for 120 hrs, then root and leaf samples were collected and Na + and B content were determined. Transcript accumulation of three salt stress-related genes SOS1, NHX2 and HKT1 and three B stress-related genes BOR1, BOR2 and PIP1;2 were determined in roots and leaves of Lluteño maize using RT-PCR and real-time PCR at 3 and 96 h after treatment with 150 mM NaCl and/or 20 ppm B. The results indicated that combined salt and B stress caused changes in physiological parameters. The damage was more severe in B73 than in Lluteño maize, confirming that this landrace behaves as a plant tolerant to these stresses. Regulation of stress-related genes under combined stress was different under individual stresses. The ability of Lluteño maize to survive and thrive in soil with high salinity and B concentration is probably based on a decrease in membrane water permeability, preventing salt and B uptake from the roots through down-regulation of BOR1, BOR2 transporters and PIP1;2 aquaporin. The increased water transport is mediated by the upregulation of the PIP1;2 in leaves, allowing cellular water conservation, and the retrieval of Na + from xylem through up-regulation of HKT1;1 transporters in roots and leaves.

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Interaction between salt and heat stress: when two wrongs make a right

Abstract: This article comments on: http://onlinelibrary.wiley.com/doi/10.1111/pce.12199/abstract

Cited by 19 publications

References 15 publications

The Plant Heat Stress Transcription Factors (HSFs): Structure, Regulation, and Function in Response to Abiotic Stresses

The Plant Heat Stress Transcription Factors (HSFs): Structure, Regulation, and Function in Response to Abiotic Stresses

HsfB2b-mediated repression ofPRR7directs abiotic stress responses of the circadian clock

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