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Narendra Tuteja - One of the best experts on this subject based on the ideXlab platform.
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a new dead box helicase atp binding protein osabp from rice is responsive to Abiotic Stress
Plant Signaling & Behavior, 2012Co-Authors: Anca Macovei, Neha Vaid, Suresh Tula, Narendra TutejaAbstract:The DEAD-box RNA helicase family comprise enzymes that participate in every aspect of RNA metabolism, associated with a diverse range of cellular functions including response to Abiotic Stress. In the present study, we report on the identification of a new DEAD-box helicase ATP-binding protein (OsABP) from rice which is upregulated in response e to multiple Abiotic Stress treatments including NaCl, dehydration, ABA, blue and red light. It possesses an ORF of 2772 nt, encoding a protein of 923 aa, which contains the DEAD and helicase C-terminal domains, along with the nine conserved motifs specific to DEAD-box helicases. The in silico putative interaction with other proteins showed that OsABP interacts with proteins involved in RNA metabolism, signal transduction or Stress response. These results imply that OsABP might perform important functions in the cellular response to specific Abiotic Stress.
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plant signaling under Abiotic Stress environment
2012Co-Authors: Parvaiz Ahmad, Renu Bhardwaj, Narendra TutejaAbstract:Abiotic Stress is one of the major factors that negatively affect crops yield; therefore, development of Stress-tolerant crops is essential for future food security. The Stress stimuli are perceived by the plasma membrane and different signals get activated. In response to the Stress, expression of many genes gets altered which plays an important role in the transmission of the signals. Various chemicals are also responsible for these signals like calcium (Ca2+), nitric oxide (NO), sugars, abscisic acid (ABA), brassinosteroids (BRs), ethylene, jasmonates (JA), salicylic acid (SA), and auxins. Ca2+ acts as a secondary messenger to perceive the environmental stimuli and transduce them into downstream effectors in order to bring about changes leading to adaptations to Stressful conditions or developmental effects. The phytohormones have a role in tolerance and adaptations to plants under Abiotic Stress. During Abiotic Stress, cross talk between different signaling pathways is very common. In the present review, we elucidated the role of these chemicals in plant signaling under Abiotic Stress. The signal transduction pathway involving mitogen-activated protein kinases (MAPK) under Abiotic Stress is also discussed.
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Unraveling the role of fungal symbionts in plant Abiotic Stress tolerance
Plant signaling & behavior, 2011Co-Authors: Lamabam Peter Singh, Sarvajeet Singh Gill, Narendra TutejaAbstract:Fungal symbionts have been found associated with every plant studied in natural ecosystem, where they colonize and reside entirely in the internal tissues of their host plant or partially. Fungal endophytes can express/form a range of different lifestyle/relationships with different host including symbiotic, mutualistic, commensalistic and parasitic in response to host genotype and environmental factors. In mutualistic association fungal endophyte can enhance growth, increase reproductive success and confer biotic and Abiotic Stress tolerance to its host plant. Since Abiotic Stress such as, drought, high soil salinity, heat, cold, oxidative Stress, heavy metal toxicity is the common adverse environmental conditions that affect and limit crop productivity worldwide. It may be a promising alternative strategy to exploit fungal endophytes to overcome the limitations to crop production brought by Abiotic Stress. There is increasing interest in developing the potential biotechnological applications of fungal endophytes for improving plant Stress tolerance and sustainable production of food crops. Here we have described the fungal symbioses, fungal symbionts and their role in Abiotic Stress tolerance. A putative mechanism of Stress tolerance by symbionts has also been covered.
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unraveling the role of fungal symbionts in plant Abiotic Stress tolerance
Plant Signaling & Behavior, 2011Co-Authors: Lamabam Peter Singh, Sarvajeet Singh Gill, Narendra TutejaAbstract:Fungal symbionts have been found to be associated with every plant studied in the natural ecosystem, where they colonize and reside entirely or partially in the internal tissues of their host plant. Fungal endophytes can express/form a range of different lifestyle/relationships with different host including symbiotic, mutualistic, commensalistic and parasitic in response to host genotype and environmental factors. In mutualistic association fungal endophyte can enhance growth, increase reproductive success and confer biotic and Abiotic Stress tolerance to its host plant. Since Abiotic Stress such as, drought, high soil salinity, heat, cold, oxidative Stress and heavy metal toxicity is the common adverse environmental conditions that affect and limit crop productivity worldwide. It may be a promising alternative strategy to exploit fungal endophytes to overcome the limitations to crop production brought by Abiotic Stress. There is an increasing interest in developing the potential biotechnological applications of fungal endophytes for improving plant Stress tolerance and sustainable production of food crops. Here we have described the fungal symbioses, fungal symbionts and their role in Abiotic Stress tolerance. A putative mechanism of Stress tolerance by symbionts has also been covered.
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Abscisic Acid and Abiotic Stress signaling.
Plant Signal. Behav., 2007Co-Authors: Narendra TutejaAbstract:Abiotic Stress is severe environmental Stress, which impairs crop production on irrigated land worldwide. Overall, the susceptibility or tolerance to the Stress in plants is a coordinated action of multiple Stress responsive genes, which also cross-talk with other components of Stress signal transduction pathways. Plant responses to Abiotic Stress can be determined by the severity of the Stress and by the metabolic status of the plant. Abscisic acid (ABA) is a phytohormone critical for plant growth and development and plays an important role in integrating various Stress signals and controlling downstream Stress responses. Plants have to adjust ABA levels constantly in responce to changing physiological and environmental conditions. To date, the mechanisms for fine-tuning of ABA levels remain elusive. The mechanisms by which plants respond to Stress include both ABA-dependent and ABA-independent processes. Various transcription factors such as DREB2A/2B, AREB1, RD22BP1 and MYC/MYB are known to regulate the ABA-responsive gene expression through interacting with their corrosponding cis-acting elements such as DRE/CRT, ABRE and MYCRS/MYBRS, respectively. Understanding these mechanisms is important to improve Stress tolerance in crops plants. This article first describes the general pathway for plant Stress response followed by roles of ABA and transcription factors in Stress tolerance including the regulation of ABA biosynthesis.
Kazuko Yamaguchishinozaki - One of the best experts on this subject based on the ideXlab platform.
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ap2 erf family transcription factors in plant Abiotic Stress responses
Biochimica et Biophysica Acta, 2012Co-Authors: Junya Mizoi, Kazuo Shinozaki, Kazuko YamaguchishinozakiAbstract:In terrestrial environments, temperature and water conditions are highly variable, and extreme temperatures and water conditions affect the survival, growth and reproduction of plants. To protect cells and sustain growth under such conditions of Abiotic Stress, plants respond to unfavourable changes in their environments in developmental, physiological and biochemical ways. These responses require expression of Stress-responsive genes, which are regulated by a network of transcription factors. The AP2/ERF family is a large family of plant-specific transcription factors that share a well-conserved DNA-binding domain. This transcription factor family includes DRE-binding proteins (DREBs), which activate the expression of Abiotic Stress-responsive genes via specific binding to the dehydration-responsive element/C-repeat (DRE/CRT) cis-acting element in their promoters. In this review, we discuss the functions of the AP2/ERF-type transcription factors in plant Abiotic Stress responses, with special emphasis on the regulations and functions of two major types of DREBs, DREB1/CBF and DREB2. In addition, we summarise the involvement of other AP2/ERF-type transcription factors in Abiotic Stress responses, which has recently become clear. This article is part of a Special Issue entitled: Plant gene regulation in response to Abiotic Stress.
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nac transcription factors in plant Abiotic Stress responses
Biochimica et Biophysica Acta, 2012Co-Authors: Kazuo Nakashima, Junya Mizoi, Kazuo Shinozaki, Hironori Takasaki, Kazuko YamaguchishinozakiAbstract:Abiotic Stresses such as drought and high salinity adversely affect the growth and productivity of plants, including crops. The development of Stress-tolerant crops will be greatly advantageous for modern agriculture in areas that are prone to such Stresses. In recent years, several advances have been made towards identifying potential Stress related genes which are capable of increasing the tolerance of plants to Abiotic Stress. NAC proteins are plant-specific transcription factors and more than 100 NAC genes have been identified in Arabidopsis and rice to date. Phylogenetic analyses indicate that the six major groups were already established at least in an ancient moss lineage. NAC transcription factors have a variety of important functions not only in plant development but also in Abiotic Stress responses. Stress-inducible NAC genes have been shown to be involved in Abiotic Stress tolerance. Transgenic Arabidopsis and rice plants overexpressing Stress-responsive NAC (SNAC) genes have exhibited improved drought tolerance. These studies indicate that SNAC factors have important roles for the control of Abiotic Stress tolerance and that their overexpression can improve Stress tolerance via biotechnological approaches. Although these transcription factors can bind to the same core NAC recognition sequence, recent studies have demonstrated that the effects of NAC factors for growth are different. Moreover, the NAC proteins are capable of functioning as homo- or hetero-dimer forms. Thus, SNAC factors can be useful for improving Stress tolerance in transgenic plants, although the mechanism for mediating the Stress tolerance of these homologous factors is complex in plants. Recent studies also suggest that crosstalk may exist between Stress responses and plant growth. This article is part of a Special Issue entitled: Plant gene regulation in response to Abiotic Stress.
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functional analysis of an arabidopsis thaliana Abiotic Stress inducible facilitated diffusion transporter for monosaccharides
Journal of Biological Chemistry, 2010Co-Authors: Kohji Yamada, Yuriko Osakabe, Junya Mizoi, Kazuo Nakashima, Yasunari Fujita, Kazuo Shinozaki, Kazuko YamaguchishinozakiAbstract:Sugars play indispensable roles in biological reactions and are distributed into various tissues or organelles via transporters in plants. Under Abiotic Stress conditions, plants accumulate sugars as a means to increase Stress tolerance. Here, we report an Abiotic Stress-inducible transporter for monosaccharides from Arabidopsis thaliana that is termed ESL1 (ERD six-like 1). Expression of ESL1 was induced under drought and high salinity conditions and with exogenous application of abscisic acid. Promoter analyses using β-glucuronidase and green fluorescent protein reporters revealed that ESL1 is mainly expressed in pericycle and xylem parenchyma cells. The fluorescence of ESL1-green fluorescent protein-fused protein was detected at tonoplast in transgenic Arabidopsis plants and tobacco BY-2 cells. Furthermore, alanine-scanning mutagenesis revealed that an N-terminal LXXXLL motif in ESL1 was essential for its localization at the tonoplast. Transgenic BY-2 cells expressing mutated ESL1, which was localized at the plasma membrane, showed an uptake ability for monosaccharides. Moreover, the value of Km for glucose uptake activity of mutated ESL1 in the transgenic BY-2 cells was extraordinarily high, and the transport activity was independent from a proton gradient. These results indicate that ESL1 is a low affinity facilitated diffusion transporter. Finally, we detected that vacuolar invertase activity was increased under Abiotic Stress conditions, and the expression patterns of vacuolar invertase genes were similar to that of ESL1. Under Abiotic Stress conditions, ESL1 might function coordinately with the vacuolar invertase to regulate osmotic pressure by affecting the accumulation of sugar in plant cells.
Ron Mittler - One of the best experts on this subject based on the ideXlab platform.
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reactive oxygen species Abiotic Stress and Stress combination
Plant Journal, 2017Co-Authors: Feroza K Choudhury, Eduardo Blumwald, Rosa M Rivero, Ron MittlerAbstract:Reactive oxygen species (ROS) play a key role in the acclimation process of plants to Abiotic Stress. They primarily function as signal transduction molecules that regulate different pathways during plant acclimation to Stress, but are also toxic byproducts of Stress metabolism. Because each subcellular compartment in plants contains its own set of ROS-producing and ROS-scavenging pathways, the steady-state level of ROS, as well as the redox state of each compartment, is different at any given time giving rise to a distinct signature of ROS levels at the different compartments of the cell. Here we review recent studies on the role of ROS in Abiotic Stress in plants, and propose that different Abiotic Stresses, such as drought, heat, salinity and high light, result in different ROS signatures that determine the specificity of the acclimation response and help tailor it to the exact Stress the plant encounters. We further address the role of ROS in the acclimation of plants to Stress combination as well as the role of ROS in mediating rapid systemic signaling during Abiotic Stress. We conclude that as long as cells maintain high enough energy reserves to detoxify ROS, ROS is beneficial to plants during Abiotic Stress enabling them to adjust their metabolism and mount a proper acclimation response.
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reactive oxygen signaling and Abiotic Stress
Physiologia Plantarum, 2008Co-Authors: Gad Miller, Ron Mittler, Vladimir ShulaevAbstract:Reactive oxygen species (ROS) play a dual role in plant biology acting on the one hand as important signal transduction molecules and on the other as toxic by-products of aerobic metabolism that accumulate in cells during different Stress conditions. Because of their toxicity as well as their important signaling role, the level of ROS in cells is tightly controlled by a vast network of genes termed the 'ROS gene network'. Using mutants deficient in key ROS-scavenging enzymes, we have defined a signaling pathway that is activated in cells in response to ROS accumulation. Interestingly, many of the key players in this pathway, including different zinc finger proteins and WRKY transcription factors, are also central regulators of Abiotic Stress responses involved in temperature, salinity and osmotic Stresses. Here, we describe our recent findings and discuss how ROS integrate different signals originating from different cellular compartments during Abiotic Stress.
Jiankang Zhu - One of the best experts on this subject based on the ideXlab platform.
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Abiotic Stress signaling and responses in plants
Cell, 2016Co-Authors: Jiankang ZhuAbstract:As sessile organisms, plants must cope with Abiotic Stress such as soil salinity, drought, and extreme temperatures. Core Stress-signaling pathways involve protein kinases related to the yeast SNF1 and mammalian AMPK, suggesting that Stress signaling in plants evolved from energy sensing. Stress signaling regulates proteins critical for ion and water transport and for metabolic and gene-expression reprogramming to bring about ionic and water homeostasis and cellular stability under Stress conditions. Understanding Stress signaling and responses will increase our ability to improve Stress resistance in crops to achieve agricultural sustainability and food security for a growing world population.
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small rnas as big players in plant Abiotic Stress responses and nutrient deprivation
Trends in Plant Science, 2007Co-Authors: Ramanjulu Sunkar, Viswanathan Chinnusamy, Jianhua Zhu, Jiankang ZhuAbstract:Abiotic Stress is one of the primary causes of crop losses worldwide. Much progress has been made in unraveling the complex Stress response mechanisms, particularly in the identification of Stress responsive protein-coding genes. In addition to protein coding genes, recently discovered microRNAs (miRNAs) and endogenous small interfering RNAs (siRNAs) have emerged as important players in plant Stress responses. Initial clues suggesting that small RNAs are involved in plant Stress responses stem from studies showing Stress regulation of miRNAs and endogenous siRNAs, as well as from target predictions for some miRNAs. Subsequent studies have demonstrated an important functional role for these small RNAs in Abiotic Stress responses. This review focuses on recent advances, with emphasis on integration of small RNAs in Stress regulatory networks.
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Abiotic Stress signal transduction in plants molecular and genetic perspectives
Physiologia Plantarum, 2001Co-Authors: Liming Xiong, Jiankang ZhuAbstract:Low temperature, drought and salinity are major adverse environmental factors that limit plant productivity. Understanding the mechanisms by which plants perceive and transduce these Stress signals to initiate adaptive responses is essential for engineering Stress-tolerant crop plants. Molecular and biochemical studies suggest that Abiotic Stress signaling in plants involves receptor-coupled phosphorelay, phosphoinositol-induced Ca2+ changes, mitogen-activated protein kinase cascades and transcriptional activation of Stress-responsive genes. In addition, protein posttranslational modifications and adapter or scaffold-mediated protein-protein interactions are also important in Abiotic Stress signal transduction. Most of these signaling modules, however, have not been genetically established to function in plant Abiotic Stress signal transduction. To overcome the scarcity of Abiotic Stress-specific phenotypes for conventional genetic screens, molecular genetic analysis using Stress-responsive promoter-driven reporter is suggested as an alternative approach to genetically dissect Abiotic Stress signaling networks in plants.
Raimund Tenhaken - One of the best experts on this subject based on the ideXlab platform.
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cell wall remodeling under Abiotic Stress
Frontiers in Plant Science, 2015Co-Authors: Raimund TenhakenAbstract:Plants exposed to Abiotic Stress respond to the unfavorable conditions at multiple levels. One challenge under drought Stress is to reduce shoot growth while maintaining root growth, a process requiring differential cell wall synthesis and remodeling. Key players in this process are the formation of reactive oxygen species (ROS) and peroxidases, which initially cross-link phenolic compounds and glycoproteins of the cell walls causing stiffening. The function of ROS shifts after having converted all of the peroxidase substrates in the cell wall. If ROS-levels remain high during prolonged Stress, OH°-radicals are formed which lead to polymer cleavage. In concert with xyloglucan modifying enzymes and expansins, the resulting cell wall loosening allows further growth of Stressed organs.
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Cell wall remodeling under Abiotic Stress
Frontiers in Plant Science, 2015Co-Authors: Raimund TenhakenAbstract:Plants exposed to Abiotic Stress respond to unfavorable conditions on multiple levels. One challenge under drought Stress is to reduce shoot growth while maintaining root growth, a process requiring differential cell wall synthesis and remodeling. Key players in this process are the formation of reactive oxygen species (ROS) and peroxidases, which initially cross-link phenolic compounds and glycoproteins of the cell walls causing stiffening. The function of ROS shifts after having converted all the peroxidase substrates in the cell wall. If ROS-levels remain high during prolonged Stress, OH°-radicals are formed which lead to polymer cleavage. In concert with xyloglucan modifying enzymes and expansins, the resulting cell wall loosening allows further growth of Stressed organs.
