what is a plants typical response to water stress?

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Front end Institute Sci. 2014; v: 86.

Response of plants to h2o stress

Yuriko Osakabe

1Gene Discovery Inquiry Group, RIKEN Heart for Sustainable Resources Scientific discipline, Tsukuba, Japan

Keishi Osakabe

twoCenter for Collaboration among Agriculture, Industry and Commerce, The University of Tokushima, Tokushima, Japan

Kazuo Shinozaki

1Cistron Discovery Research Group, RIKEN Middle for Sustainable Resource Science, Tsukuba, Nippon

Lam-Son P. Tran

3Signaling Pathway Enquiry Unit, RIKEN Center for Sustainable Resource Scientific discipline, Yokohoma, Nippon

Abstract

Water stress adversely impacts many aspects of the physiology of plants, specially photosynthetic capacity. If the stress is prolonged, plant growth, and productivity are severely diminished. Plants take evolved complex physiological and biochemical adaptations to arrange and adapt to a variety of environmental stresses. The molecular and physiological mechanisms associated with water-stress tolerance and h2o-use efficiency have been extensively studied. The systems that regulate found adaptation to h2o stress through a sophisticated regulatory network are the discipline of the electric current review. Molecular mechanisms that plants use to increment stress tolerance, maintain appropriate hormone homeostasis and responses and prevent backlog low-cal damage, are also discussed. An understanding of how these systems are regulated and ameliorate the impact of water stress on constitute productivity volition provide the data needed to improve plant stress tolerance using biotechnology, while maintaining the yield and quality of crops.

Keywords: abiotic stress, biomass, drought stress, photosynthesis, reactive oxygen species, stomatal closure

INTRODUCTION

Institute growth and productivity are adversely affected by water stress. Therefore, the development of plants with increased survivability and growth during water stress is a major objective in the convenance crops. H2o use efficiency (WUE), a parameter of crop quality and functioning under water deficit is an of import selection trait. In fact, plants accept evolved various molecular mechanisms to reduce their consumption of resources and adjust their growth to adapt to adverse environmental atmospheric condition (Yamaguchi-Shinozaki and Shinozaki, 2006; Ahuja et al., 2010; Skirycz and Inze, 2010; Osakabe et al., 2011; Nishiyama et al., 2013; Ha et al., 2014).

Institute growth is anchored past photosynthesis; however, backlog light (EL) tin cause severe damage to plants. EL induces photooxidation, which results in the increased production of highly reactive oxygen intermediates that negatively touch on biological molecules and, if severe, a meaning decrease in found productivity (Li et al., 2009). H2o stress that induces a decrease in leaf water potential and in stomatal opening (Figure ane ), leading to the down-regulation of photosynthesis-related genes and reduced availability of CO2, has been known as i of the major factors in the EL stress (Osakabe and Osakabe, 2012).

An external file that holds a picture, illustration, etc.  Object name is fpls-05-00086-g001.jpg

Illustration of the response of plants to water stress. Stomatal response, ROS scavenging, metabolic changes, and photosynthesis are all affected when plants are subjected to water stress. These collective responses lead to an adjustment in the growth charge per unit of plants every bit an adaptive response for survival.

Various molecular networks, including bespeak transduction, are involved in stress responses (Osakabe et al., 2011, 2013b; Nishiyama et al., 2013). The elucidation of these networks is essential to improve the stress tolerance of crops. In this review, plant responses to water stress are summarized, revealing that they are controlled past circuitous regulatory events mediated by abscisic acid (ABA) signaling, ion send, and the activities of transcription factors (TFs) involved in the regulation of stomatal responses, all of which are integrated into orchestrated molecular networks, enabling plants to adjust and survive. Furthermore, contempo findings on molecular mechanisms involved in protecting photosynthesis in order to accommodate plant growth during h2o stress are discussed.

STOMATAL SIGNALING DURING H2o STRESS

MEMBRANE TRANSPORT AND ABA SIGNALING IN STOMATAL RESPONSES

Stomatal activity, which is affected by ecology stresses, can influence CO2 absorption and thus impact photosynthesis and plant growth. In response to a water deficit stress, ion- and water-transport systems across membranes function to control turgor force per unit area changes in guard cells and stimulate stomatal closure. Endogenous ABA is rapidly produced during drought, triggering a cascade of physiological responses, including stomatal closure, which is regulated by a signal transduction network. nine-cis-epoxycarotenoid dioxygenase iii (NCED3) in Arabidopsis catalyzes a key step in ABA biosynthesis, and NCED3 expression is rapidly induced by drought stress in a vascular tissue-specific manner (Iuchi et al., 2001; Endo et al., 2008; Behnam et al., 2013; Figure 2 ). Mutations in nced3 reduced, while the overexpression of NCED3 enhanced drought tolerance and/or increased WUE in several plant species (Iuchi et al., 2001; Tung et al., 2008). During drought stress, the accumulated ABA in the vascular tissue is transported to guard cells via passive diffusion in response to pH changes and by specific transporters. Two members of the membrane-localized ABC transporter family unit, ABCG25 and ABCG40, and one fellow member from a nitrate transporter family unit, AIT1/NRT1.2/NPF4.six, accept been independently isolated from Arabidopsis and reported as ABA transporters (Kang et al., 2010; Kuromori et al., 2010; Kanno et al., 2012; Figure two ). ABCG25 has a part in ABA consign, whereas ABCG40 and AIT1 are involved in the import of ABA. ABA-induced stomatal closure and gene expression are reduced in the atabcg40 mutation, resulting in reduced drought tolerance (Kang et al., 2010). These data indicate that the ABA ship system plays a significant role in water deficit tolerance and growth adjustment. Transcription of ABCG25 was induced by ABA and drought stress, and exhibited vascular tissue-specificity (Kuromori et al., 2010). In contrast, ABCG40 was expressed in baby-sit cells (Kang et al., 2010), suggesting the possibility that the ABA synthesized in the vasculature during drought stress can be imported into the guard cells via these transporters. The expression design of AIT1/NRT1.2/NPF4.6 was similar to ABCG25 and also showed vascular tissue-specificity (Kanno et al., 2012). This finding suggests that ABA import systems in vascular tissues may also play an important part in the regulation of h2o stress responses.

An external file that holds a picture, illustration, etc.  Object name is fpls-05-00086-g002.jpg

Model for the role of signaling factors in stomatal closure and retrograde signaling during water stress.

In response to drought stress, ABA stimulates a signaling pathway that triggers the production of reactive oxygen species (ROS), which in turn induces an increase in cytosolic Ca2 +. Subsequently, ii distinct types of anion channels, a boring-activating sustained (S-type), and a rapid-transient (R-type), are activated and the anion efflux results in a depolarization of the plasma membrane. This leads to a decrease in the inward K+ channels (KAT1/KAT2) and H+-ATPase, which are involved in stomatal opening, and the activation of outward Thousand+ channels, including GUARD CELL OUTWARD RECTIFYING 1000+ Aqueduct (GORK) that has a role in G+ efflux. The anion and Thou+ efflux from baby-sit cells results in a reduction of guard jail cell turgor which causes stomatal closure (Schroeder and Hagiwara, 1989; Pei et al., 1997; Kwak et al., 2003; Negi et al., 2008; Vahisalu et al., 2008). SLAC1 (Boring ANION Aqueduct-ASSOCIATED 1) functions as a major South-type anion channel in guard cells (Negi et al., 2008; Vahisalu et al., 2008), and is activated directly by a Snf1-related poly peptide kinase 2 (SRK2E/OST1/SnRK2.half dozen). This kinase is involved in the ABA-signaling circuitous of the ABA receptor, PYR family and PP2Cs (Geiger et al., 2009; Lee et al., 2009). S-type anion channels are too activated by the calcium-dependent protein kinases CPK3, CPK6, CPK21, and CPK23 (Geiger et al., 2010; Brandt et al., 2012). KAT1 has as well been shown to be a straight target of regulation by ABA, since its activity is directly inhibited via phosphorylation by an ABA-activated SRK2E (Sato et al., 2009). Recently, the action of KUP6, a KUP/HAK/KT family unit One thousand+ transporter, has likewise been shown to exist involved in the direct regulation during drought stress via phosphorylation by an ABA-activated SRK2E (Osakabe et al., 2013a). These results suggest that the complicated, but direct, command of ion transport systems by ABA may play an important role in stomatal responses that impact the tolerance of plants to water stress and influence plant growth (Figure 2 ).

TRANSCRIPTION FACTORS

The expression of various genes with functions in the water deficit responses, are specifically induced during the stress. Transcriptomic and proteomic analyses in various species have identified the involvement of general physiological processes associated with drought-responsive gene expression (Molina et al., 2008; Aprile et al., 2009; Walia et al., 2009; Abebe et al., 2010; Dugas et al., 2011; Jogaiah et al., 2012; Le et al., 2012; Utsumi et al., 2012). These studies have identified the conserved, as well as, species-specific regulatory and functional drought-responsive genes, including osmoprotectants and ABA biosynthesis, late embryogenesis abundant (LEA) and chaperone, ROS-related, ion homeostasis, and signaling genes. Additionally, key TFs regulating drought-responsive gene transcription have besides been identified, such equally MYB, MYC, DREB/CBF (drought-responsive cis-element bounden protein/C-repeat-binding factor), ABF/AREB, NAC, and WRKY TFs (Stockinger et al., 1997; Sakuma et al., 2006; Tran et al., 2007b; Nakashima et al., 2009; Ishida et al., 2012; Figure 2 ). Corresponding cis-motifs, DRE/CRT and ABRE (ABA-responsive cis-element), have also been discovered in the promoters of many stress-responsive genes (Yamaguchi-Shinozaki and Shinozaki, 2006).

ABA-responsive cis-element-mediated transcription via ABF/AREB is directly regulated by an ABA receptor complex involving SnRK2 that activate ABF/AREBs by phosphorylation (Umezawa et al., 2010). The action of SnRK2 represents one of the important mechanisms regulating the rapid, adaptive response of plants to drought. DREB and AREB activate the transcription of diverse genes that are expressed in diversity tissues. Additionally, novel types of TFs, with critical functions in stomatal responses, have also been identified. DST (drought and salt tolerance), a C2H2-type TF, controls the expression of genes involved in H2Oii homeostasis, and mediates ROS-induced stomatal closure and abiotic stress tolerance in rice (Huang et al., 2009). Drought-inducible nuclear TF, NFYA5, was reported to command stomatal discontinuity and play a office in drought tolerance in Arabidopsis (Li et al., 2008). SNAC1 (STRESS-RESPONSIVE NAC1) is expressed in rice guard cells, and overexpression of this cistron enhanced ABA sensitivity, stomatal closure, and both DST in rice (Hu et al., 2006). AtMYB60 and AtMYB61 are expressed mainly in guard cells, and important TFs regulating stomatal aperture and drought tolerance in plants (Cominelli et al., 2005). AtMYB60 is a negative regulator of stomatal closure (Cominelli et al., 2005; Liang et al., 2005). Further studies to determine the molecular targets and signaling systems associated with these TFs in stomatal responses will increment our understanding of the regulatory networks controlling plant drought responses and growth adjustment.

EARLY Water STRESS RESPONSE AND Signal TRANSDUCTION PATHWAYS

Receptor and sensor proteins localized to membranes play important roles in various signaling pathways, carrying data to their cytoplasmic target proteins via catalytic processes, such as phosphorylation. Plasma membrane signaling has been hypothesized to be involved in the initial process of water status perception exterior the cell (Maathuis, 2013). AHK1, an Arabidopsis histidine kinase (HK) localized to the plasma membrane mediates osmotic-stress signaling in prokaryotes and has been shown to part as an osmosensor. Overexpression of AHK1 enhanced drought tolerance in Arabidopsis (Urao et al., 1999; Tran et al., 2007a). ahk1 mutants exhibited decreased sensitivity to ABA and the downregulation of ABA- and/or stress-responsive genes, indicating that AHK1 acts as an osmosensor and functions as a positive regulator of osmotic-stress signaling (Tran et al., 2007a; Wohlbach et al., 2008). Downstream AHK1 cascades appear to exist controlled by AHPs and ARRs as office of a multiple His-Asp phosphorelay. However, the factors that receive signals from AHK1, and also the precise composition of the signaling cascades, remain to be determined. In dissimilarity, in Arabidopsis, the cytokinin (CK) receptor HKs, AHK2, AHK3, and AHK4, have been shown to negatively regulate ABA and drought signaling (Tran et al., 2007a, 2010). Multiple mutants of ahk2, ahk3, and ahk4 display increased sensitivity to ABA and enhanced tolerance to drought (Tran et al., 2007a; Jeon et al., 2010). These findings indicate the being of crosstalk amidst ABA, CK, and stress-signaling pathways(Nishiyama et al., 2011; Ha et al., 2012).

In Arabidopsis, the receptor-similar kinase (RLK) family includes more than 600 members, with the leucine rich-echo (LRR)-RLKs constituting the largest subgroup (Gish and Clark, 2011). Several RLKs localized to the plasma membrane are known to be involved in the early steps of osmotic-stress signaling in a diverseness of plant species (Osakabe et al., 2013b). These stress-related RLKs possess a number of different extracellular domains (eastward.g., LRR, an extensin-similar domain, or a cysteine-rich domain; Bai et al., 2009; de Lorenzo et al., 2009; Osakabe et al., 2010a; Yang et al., 2010; Tanaka et al., 2012), indicating that unlike ecology stimuli may activate RLK-mediated signaling pathways and convey the osmotic conditions outside of the cells. RLKs that bind to prison cell-walls, such as cell wall-associated kinases (WAKs), the proline-rich extensin-like receptor kinase (PERKs; Osakabe et al., 2013b), and the CrRLKs (Catharanthus roseus RLK1-like family; Schulze-Muth et al., 1996) have recently been predicted to be involved in the perception of turgor force per unit area (Steinwand and Kieber, 2010; Christmann et al., 2013). A potential link between the RLKs in cell-wall bounden, ABA biosynthesis and water stress response could be determined past analyzing their roles in signaling systems associated with specific mechanosensing pathways activated in response to water stress. This would shed light on the early signaling organisation controlling water stress tolerance and growth adjustment.

PROTECTING PHOTOSYNTHESIS DURING WATER STRESS

Water stress straight affects rates of photosynthesis due to the decreased CO2 availability resulted from stomatal closure (Flexas et al., 2006; Chaves et al., 2009), and/or from changes in photosynthetic metabolism (Lawlor, 2002). EL has a negative effect on photosynthesis when the rates of photosynthesis are reduced by water stress (Li et al., 2009; Osakabe and Osakabe, 2012). A strong interconnection between the responses to EL and drought stresses has been suggested, and around 70% genes induced by EL are also induced by drought (Kimura et al., 2002; Chan et al., 2010; Estavillo et al., 2011). EL too stimulates the production of ROS, such equally HtwoOtwo, superoxide (O2 -) and singlet oxygen (1Oii), past specific photochemical and biochemical processes, which also exerts deleterious effects on photosynthesis (Li et al., 2009). HtwoO2 induces the upwards-regulation of a diversity of genes that overlap with genes up-regulated by various chemical and environmental stresses, such as methyl viologen, heat, cold, and drought (Vandenabeele et al., 2004; Vanderauwera et al., 2005). The transcription of cytosolic ascorbate peroxidase encoding genes (APXs), which have important roles in the scavenging of cytosolic H2Otwo, responds positively to EL stress and the redox land of plastoquinone (PQ; Karpinski et al., 1997). APX loss-of-office mutants exhibited an accumulation of degraded chloroplast proteins, indicating that APXs play a protective role as ROS scavengers for chloroplast proteins under EL conditions (Davletova et al., 2005; Li et al., 2009). AtAPX2 was also induced by drought stress and ABA (Rossel et al., 2006), suggesting that APX mediates ROS scavenging in response to both EL and h2o stress. A gain-of-role mutant, contradistinct apx2 expression eight (alx8), which has constitutively higher levels of APX2 expression, exhibited improved WUE and drought tolerance (Rossel et al., 2006; Wilson et al., 2009; Estavillo et al., 2011). In Arabidopsis, the zinc-finger TFs, ZAT10 and ZAT12, are induced in plants acclimated to EL or ROS treatment. The overexpression of ZAT10 and ZAT12 highly induced expression of various stress-related genes, including APXs (Rizhsky et al., 2004; Davletova et al., 2005; Rossel et al., 2007). Several transgenic lines that overexpressed ZAT10 exhibited enhanced drought stress tolerance (Sakamoto et al., 2004). ZAT10 and ZAT12 regulate the responses to EL and drought stresses, which are mediated past ROS (Davletova et al., 2005; Mittler et al., 2006), suggesting their potential roles in protecting photosynthesis from the injury during h2o stress (Effigy 2 ).

Plants can monitor chloroplast status by plastid-to-nucleus signals, as plastid-to-nucleus retrograde signaling. This signaling organization tin can regulate the expression of genes that office in the chloroplast. The retrograde signaling plays an important role in regulating the chloroplastic processes and also in the adaptive responses to ecology stresses (Chan et al., 2010). Chlorophyll intermediates, such as Mg-protoporphyrin 9 (Mg-Proto), control the expression of nuclear genes in plants exposed to EL conditions, acting as a retrograde signal. The genomes uncoupled (gun) mutants, gun4 and gun5, exhibit impaired generation of Mg-Proto that has been shown to deed every bit a bespeak to repress LHCB gene expression in Arabidopsis (Mochizuki et al., 2001; Strand et al., 2003; Pontier et al., 2007). LHCB expression is also controlled by GUN1 and ABI4 (ABSCISIC Acrid-INSENSITIVE 4) that encodes a TF involved in ABA signaling (Koussevitzky et al., 2007). Collectively, these factors are thought to be involved in multiple retrograde signaling pathways. Moulin et al. (2008) re-examined the proposed office of Mg-Proto and other chlorophyll intermediates as signaling molecules and reported that none of the intermediates could be detected in ROS-induced plants nether conditions where nuclear gene expression was repressed. The authors hypothesized that Mg-Proto (which accumulates in a calorie-free-dependent manner) is extremely curt-lived and may generate 1Oii nether EL conditions; however, a much more complex ROS signal may be generated during chloroplast degradation. There is increasing evidence for the regulation of nuclear gene expression by 1O2 (op den Camp et al., 2003) and HiiO2 (Kimura et al., 2003). However, a clear role for these ROS molecules, either individually or in combination, requires further investigation.

Recently, several novel retrograde signaling pathways have been identified, including the three′-phosphoadenosine v′-phosphate (PAP) pathway, which is regulated past SAL1/ALX8/FRY1, and the methylerythritol cyclodiphosphate (MEcPP) pathway (Estavillo et al., 2011; Xiao et al., 2012). PAP has been described every bit a chloroplast to nuclear mobile signal that regulates factor expression. ALX8 encodes a phosphatase that converts PAP to AMP and regulates PAP levels (Wilson et al., 2009; Estavillo et al., 2011). alx8 mutant exhibited drought-tolerant phenotypes and constitutive upregulation of approximately 25% of the EL-regulated transcriptome, suggesting that SAL1/ALX8/FRY1 tin can act equally a component of both EL and drought signaling networks, and that the SAL1-PAP retrograde pathway can alter nuclear gene expression during EL and drought (Rossel et al., 2006; Wilson et al., 2009; Estavillo et al., 2011; Effigy 2 ). MEcPP is a precursor of isoprenoids generated past the methylerythritol phosphate (MEP) pathway, and tin induce expression of nuclear encoded stress-responsive genes (Xiao et al., 2012). MEcPP is induced by diverse abiotic stresses, such every bit high light and wounding, and has been proposed to human action as a retrograde indicate in response to these stresses (Xiao et al., 2012). Prove from the above studies suggests that metabolite signals, whose levels are influenced by environmental conditions, are used to establish an interaction between plastids and the nucleus and regulate chloroplast office to adjust constitute growth in response to various stresses, including drought.

CONCLUSION AND FUTURE PERSPECTIVE

Due to the sessile life bicycle, plants have evolved mechanisms to respond and accommodate to adverse environmental stresses during their development and growth. Constitute growth is impaired by severe drought stress due to a decrease in stomatal opening, which limits CO2 uptake and hence reduces photosynthetic activeness. In order to develop strategies to maintain constitute productivity, it is essential to understand the diverse regulatory mechanisms that control and enhance adaptive responses to stress in different institute species. In this review, we focused on the molecular mechanisms involved in the plant responses to water stress and the concomitant growth adjustment. These mechanisms include stomatal responses, ion ship, activation of stress signaling pathways, and responses to protect photosynthesis from injury. Agreement these key factors will enable usa to improve found productivity during water stress.

In parallel with the identification of the key molecular factors involved in these mechanisms, new technologies to bioengineer superior plants will likewise enable the development of plants with improved plant productivity. Although transgenic approaches have been effectively used to develop institute genotypes with improved stress tolerance under field conditions, interpretation of the desired furnishings and their stability over many generations is required. Mutagenesis has also been used in plant breeding for a long fourth dimension to create genetic variation; however, it takes considerable resources and try to generate genotypes with the desired phenotype due to the random nature of the introduction of mutations. Recently, genome editing applied science has fabricated remarkable advances in the ability to modify the genome in a site-specific style. Genome editing technology utilizes custom-designed restriction endonucleases, such as zinc finger nucleases (ZFN) or TAL-effector nucleases (TALEN; Shukla et al., 2009; Osakabe et al., 2010b; Zhang et al., 2010; Cermak et al., 2011), and more than recently, the CRISPR/CAS system (Li et al., 2013; Nekrasov et al., 2013; Shan et al., 2013). Utilization of this technology volition make it possible to modify the regulation of cardinal genes that will convey improved stress tolerance while maintaining productivity. Further studies using new molecular approaches, including the identification of gene variants associated with the meaning agronomic traits, will facilitate the molecular engineering science of plants with increased tolerance to severe environmental stresses.

Conflict of Interest Statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Acknowledgments

This piece of work was supported past the Programme for Promotion of Basic and Applied Researches for Innovations in the Bio-Oriented Industry of Japan (Yuriko Osakabe and Kazuo Shinozaki). Research in Lam-Son P. Tran's lab was supported by the Grant (No. AP24-1-0076) from RIKEN Strategic Research Programme for R & D.

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