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Stress tolerance in plants.
Provisionally
India has supported 16% of global demand for food in the ground was less than 2% of the country, so agriculture has to increase the efficiency of this can only be understanding and engineering plant to survive in difficult conditions.
Plant growth. Not only to carbon dioxide and oxygen from the air. However, water and mineral nutrients from the soil. The soil was as the placenta "of" life, such as nutrients that are essential machine. All soil and plant samples in the field crop ecosystems. Throughout the history of mankind is the standard of living depends on the soil fertility and productivity.
Soil erosion and salinization caused by poor agricultural practices accelerated. Neglect and mismanagement of the can destroy the soil the land suitable for cultivation, a fragile resource and valuable. Harappan civilization in the West Indian. Amazon regions sufficient only Asian female Vice and Mayan culture in Central America collapsed because the ground. Effective treatment should be the objective of social
Most plants are salt sensitive or smart glycophytes () Halophytes, opposed to native plant environment of salt water. Halophytes have a capacity to accommodate more. Salinity due to the special adaptation, anatomy and physiology, Morphology and mechanisms of action or avoidance.
Approximately 330 species of plants vesicular (eg <0.15% of total) showed resistance to desiccation.
Most ads Moose 30 000 spp of Moscow. Liverwort is hornworts desiccation tolerance postulated at least a brief low of violence.
Halophytes.
Plant growth and the life cycle of the habit of high salt. Concentrations determined by the general. These are only halophytes plants under conditions Saline common near the coast with the concentration of salt (NaCl, MgSO4, MgCl2, etc.) are relatively high. But the plant in water or in areas with water saturated is very difficult to physiological processes. Halophytes residents dry, but wet body on the ground that it the details of the morphology, anatomy, physiology and adaptation during this cycle.
Morphological adaptation. .
ROOT A).
Halophytes 1.In addition to root normal columns or prop roots develop from the fields of air. Sample origin? Large mangrove leaves.
Many times second Some root buttresses from the base of Trunk develops
Examples? numularia Dischidia.
3.In order to compensate for the lack of soil air, they develop a special root geotropic deleted, pneumatophores. This pin structures mentioned. lenticels many causes inner surface.
B) STEM.
Many succulent stems of halophytes, which according to the accumulation of free Charge carriers in this organ. They both are hard or difficult or swelling. Or obese and are often covered with hair.
C) leaves.
Visit One of the halophytes are often small and thick, juicy size genrally glassy in nature.
2.Leaves the aerohalopytes. Densely covered with trichomes on their surface.
3.Leaves of halophytes Sea Soak some rocks with thick cuticle cutinized
D fruit) and seed
Fruits, seeds and pollen mostly mild fruit surface with sticky rice that prevents damage during transport. Central Water
Halophytes special mangrove planting in the area. Show viviparous germination tidal phenomena, which can be defined as the process of germination, while fruit Attached to mother plant.
Adaptation anatomy.
Cutinized 1.Epidermis much and covered. Epidermal outgrowths, such as hair, which prevents leakage and salt spray in the plant body. The dorsiventral leaf stomata and isobilateral answer and show lower
Show 2.Cortex mucosal cavities, tannin cell niche. Spicules, schlerides characteristic salt gland changes in the cortical regions in the plant, which Salt water environment is in order.
3.Vascular integration are not well developed and secured together with the line xylum Exarch.
4.stele liginified good.
5.Most Cells have a cell wall elasticity.
Cell is a 6.mesophyll differtiated palisade and spongy parenchyma.
7.Cholorophyll content. Very low in the cells. These halophytes.
Graph [], attached to the block. Down there.
Physiological adaptation
1.salinity reduced the rate of cell division to support the elongation of the cells.
2.The ion cell free updates. Bombast and increasing salinity.
3.The plants show high evaporation are useful Salt tolerance conditions. And maintain normal metabolism.
Show your property has dissolved 4.Halophytes exudation of salt.
Salt glands of halophytes 5.Some secreting Tissues and water.
6.The viviparous mangrove plant is one of the physiological adaptation of the most important for normal growth and development of new seedlings.
The genetic diversity. In tolerant plants.
Much genetic diversity exists for salt tolerance in plants. Texa spread to many researchers in recent Genus. Decade of halophytes and glycophytes tolerant with similar strategies, often using a process similar strategy. Toxic ions in saline environments. Normal sodium chloride ions and the ions. compartmentalized in the vacuole is a salt-and osmotic. The fact that the ion balance. Control of the cellular and molecular effects of the "General Affairs for the cut. Plant salt stress response.
Genetics of stress..
For propagation or genetic engineering plant stress tolerance is essential. to find genes that control these properties and to understand the functionality of these gene products are controlled.
Inducible gene products of some stress play a role in stress. Signals and stress tolerance.
As in the synthesis of the work. Osmolytes (Solute together) or directly with the Detoxification of free radicals, or reactions in the synthesis of antioxidant ion transport, ABA synthesis of other enzymes.
Gene product may be a certain role in order to prevent damage Trunk Most of these "lines of embryonic development. Many" (LEA), such as protein
In some cases, genes that physical stress related, that some important genes in the region. Chromatin can be regulated by stress. Although these genes may not be about something else.
Example: (UFC upstream from FLC (their flowers). Genes) is a repressor gene FLC flowers log level control through the maintenance of cold (vernalization) of interest. UFC is also controlled by vernalization. Are not used. FLC in sequence or function. They are the only neighbors of the gene. Chromosome same Recommend this place very influential in the chromosome of the induction of certain genes.
Broadcast.
Broadcast. Do you have many activities coordinated cell and its signal processing trasduction Some simple. But most People with many complex elements that occur in space and time depends on the associated style
The show is a general recognition of cells by specific molecules excited to begin. (S) or the sensor may be in the mode of their molecular identities. Perception and the signal is. subcellular localization.
In plant cells frequently. Activation requires receptor called in a secondary messenger outcome. It shows the cell signal outside the main signal is interpreted. Intracellular signals by the signal to another interpreted Other (s) and results in the activation. Way downstream, that could affect many
Transmission Chart [B] for the blog link below.
Signaling pathway concept for cold and drought stress in plants salt. Vice molecular causes of calcium receptor Ions (in feed back arrow described) is twice as fine elements. In the main control over the main track. Calcium ions can cross-signal or high molecular signal from the Send.
GPCR? G - protein coupled receptors.
RLK? Receptor - like kinase.
InsP? Phosphate textiles pol.
+. Ca2 Signals and ways to enable the transfer of excess salt. Sensitive (signal) SOS.
The third is linked genetically. Lo Arabidopsis (SOS1, SOS2 and SOS3), which contain signals that control stress path and balancing ion salt tolerance. Genetic analysis of Na + / Li + sensitivity in the SOS1 is epistatic to sos2. And this sos3 sos mutants also show absence of K + phenotype medium supplemented with? M [K + ext] and [Ca2 +] ext Na + and K + and the absence to suppress sos2 sos3, with mm [ext Ca2 +] SOS1 as hyperosmotic and shown sos2 sos3 with these results demonstrate that SOS control signals, walking and Na +. K + balance and Ca2 + activated SOS3 encodes Ca2 +-binding protein with sequence similarity to calcineurin B regulatory subunit (protein phosphatase 2B). And non-contact sensors + Ca2 nerve SOS3 with SOS2 and SOS2 kinase is activated. Ca2 + function independently in planta SOS3 a factor that depends on the salt tolerance. Binds Ca2 + and Nmyristoylation SOS2 serine / Trio of Nice. kinase (446 amino acids) is 267 amino acids. N - terminal catalytic domains are similar in that order. Yeast SNF1 (sugar nonfermenting) kinase and mammals. AMPK (protein kinase - AMP-use) of the SOS2 kinase activity, the work for tolerance to salt, of course. SOS2 regulation domain C - terminal Domain interaction, the kinase autoinhibition motif amino acids in the domain. Regulation 21 of the SOS2 interaction sites. SOS3 kinase autoinhibitory domain of the kinase and binding SOS3 autoinhibition of this motif. Blog Events SOS2 kinase. The negative result domain. autoinhibitory. In activation. Sam independent of SOS3 SOS2 addition to Thr168. ASP mutation in the Volume activation domain. Constitutively activated kinase showed SOS2.Genetic and biochemical evidence that composition of functions. SOS signaling pathway in hierarchical order. Ca2 + binding to SOS3, the interaction with SOS2 kinase leads and check out the path. SOS signal transport systems that a balanced ion plasma are located Na + / H + antiporter SOS1 is controlled by way SOS transcriptional level and post - transcriptional. Recently disturbed the work of the AtHKT1 significant anti-salt has shown. Phenotype sos3 - 1 shows that the SOS pathway controlled removal of Na influx. + SOS-signaling pathway also controls the expression of negative. AtNHX related family members as factors in response to salt stress. . [Ext Ca2 +] increases salt tolerance and salt stress. induces [Ca2 + added Temporary cyt], have either internal or external sources Come join us for insights into the adaptation of yeast has the activation provided. Salt stress in Ca2 + signals that control ion balance and composition. hyperosmotic tolerance to high salinity induces short-term (1 min) in the [Cyt Ca2 +] caused by large plasma flows through Cch1p Mid1p and Ca2 + transport system, a transient increase in [Ca2 + cyt] Phosphatase Calcineurin activates PP2B (mean salt in key signaling ion balance control). The fact that the decoding of LED ENA1, which encodes ATPase P - type of prime responsibility. Na + efflux into the plasma model proposed that hyperosmotically - the [local Ca2 +] cyt transient activates calmodulin bound to the Cch1p - MIDP calmodulin activates the signal via the opening path. Calcineurin, the salt tolerance and ion balance taught. Result of this paradigm shift in the salt Ca2 + signals and activation. The SOS way for the introduction of elements of the roadway. SOS and SOS3 or upstream elements may be involved in the reaction. osmotically channels in Ca2 + influx begins. Signaling across the path. These are the components of the signaling pathway Response. different inducers, but still contain plant salinity response. SOS transmission from the body. Positive interactions with effectors or competition for surface for the signaling required positive and negative attitude control signal such adjustment may be necessary to achieve the response of plants suitable for the stress adaptation and disease stability
Cell recovery mechanisms of salt stress survival and growth.
Both plants are dormant in the salt or it will be good. cellular environment tolerant of salt water chemical potential imbalance began their potential. Between apoplast and Symplast that for the reduction. Turgor is strong enough to reduce the growth of cell dehydration begins when the water potential of difference can compensate for the loss of cell response Tugores answer. Turgor, osmotic adjustment, which is in this area through the accumulation of osmolytes, but Na + and Cl - effectively diligently cytotoxicity.Compartmentalization osmolytes osmotic adjustment and compartmentalized in the vacuole reduction of Na + and Cl - facilitates osmotic adjustment. can occur very important for the development of the cell movement of ions into the vacuole directly from the apoplast in. vacuole Membrane vesicles by cytology or process mediated by plasma of a group of Na + and tonoplast Cl - from the apoplast to the vacuole ion transport through the plasma and tonoplast SOS signaller signaling pathway is an important ion transport system must be balanced
Osmolytes and OSMOPROTECTANTS.
Some osmolytes, together important. Elements such as K + ions, but in most cases. organic substances cateogory major osmotic solutes organic sugar, contains a simple example. Fructose and glucose: sugar alcohols such as glycerol, inositols: complex sugar raffinose as further comprise four amino acids such as glycine, proline. Alanine beta: amines and sulfonium compounds, such as higher education. Sulfonium dimethyl, . Propyronate.An Adaptation of biochemical functions. osmoprotectants oxygen species scavenging reaction products is hyper-osmotic and ionic stresses. Solute death.Compatible. Cell capacity. To maintain the enzyme activity in saline conditions. Osmolytes together in the diversion of substances frequently produced. cached. Biochemical reactions often unique. This diverts metabolic stress.
Balance I - transport factors and their regulation.
Balanced salt tolerance and intracellular Na + modulation by Ca + + and high concentrations of Na +, K +, the purchase Na + K + compete with absorption through joint transport system and is not effective since oncentration Na + in saline environments are often higher than the concentration outside the cell. K +, Ca + +, K + / Na + accumulation within a cell.
Molecules the mediation of the body within. Na + and K + balance is a function of Ca + + To control these transport systems. Stress SOS signaling pathway is identified. important regulator of ion balance and salt tolerant crops.
Ion transport balance: Na +.
(A) H + pump (proton pump inhibitors).
H + pump in plasma and tonoplast fecilitate memebrane transport must be resolved. compartmentalize. Toxic-ions from the cytoplasm and function of the ion determines the signal level
These pumps are driven. (H + electrochemical potential) secondary active transport and works to create a potential breeding. Membrane easier. electrophoretic River. Ion plasma loclised H +-ATPase of the type P and the primary responsibility pump large gradients in the membrane potential gradient. Type H +-ATPase vacuolar membrane a potential in tonoplast. H + pump activity by salt treatment and stimulation of gene expression increased.
To confirm plasma membrane H +-ATPase, that tolerant. Factor analysis of phenotypes of semidominant "aha4 - 1 mutations caused. aha4 mutation to show that root and shoot and root back. growth of the roots. root length reduction of the salt treatment "Aha4. - A plant" because of the length of the cell decreased. Is postulated that "leaves aha4 - 1 plant, accumulated much less Na +. K + than the wild type, may be said that "aha4. - A function to control the flow of Na. + About the endodermis.
(B) and Na + efflux in the plasma flow. Membrane
Transportation Systems, with more options for K + is thought that to facilitate the Na-leak. are Na + in the cells for absorption by the competing Plasma K + K + outside the edit box channels facilitate the flow of Na refined. + + Well, when expressed in heterologous systems as proof function. Na +, H + transport depends on K +.
Depending on the energy, transport Na + in plasma is mediated by secondary Na jobs. + / H + antiport.
(C) Na + compartmentalization vacuole.
Na + / H + antiport on the tonoplast. The foreclosure vacuolar way SOS negative ion control. transcriptional expression of these Na + / H + antiporter gene.
Plant tolerance to drought. (Xerophytes).
Plant grown in dry conditions on the ground. xeric and high temperatures, is called the low humidity. Xerophytes Xerophytic plants are characteristic of desert and semi-desert Area.
Some of these plant development, anatomy, physiology, structural adjustment in order to avoid as much water as possible and keep the water from his body absorb a reduction in time. Volatility
Effects on plants.
o reduction of growth (ex: Restrictions for expansion cards).
o lower decrease in leaf area and photosynthetic activity.
o reduce the water content increased concentration of dissolved Substance.
o The first results in the death of hair root is the root. Reduce the ability of roots to absorb water.
o the production of phytohormones such as cytokinins and acid gibberlic lower
o reduce the production of secondary metabolites. This led to a reduction mechanism to prevent insects and disease led some.
Morphological adaptation.
ROOT A).
Xerophytes well-developed root system, the king Sawai and can elobarate as the root of the imaging system. Xerophytes trees grow very deep into the ground floor. Water is available in abundance.
B) STEM.
1st Hard and woody plant succession Body with a thick layer of wax and silica, coated or covered his hair. (Sp Calotropis).
2 In some early xerophytes with thorns may be amended. Examples? Ulex sp.
Three origins extereme some editing to B and leaf structures called fat. Phylloclades example? Muehlenbeckia sp.
4 in a certain number of branches. axullary to edit a small needle. Structures, such as green leaves and search result. Cladodes example? Asparagus sp.
C) leaves.
1.In xerophytes some leaves fall early in the season. But most of the fallen leaves of plants in general. Scale example? equisitifolia Casuarina.
2nd Some have green leaves to form a needle. Examples? Son roxburghii.
3.In some leaves are succulent and swollen dramatically. And to a large quantity excess fat storage and rubber in them. Examples? spinossina Aloe Vera.
4.Leaves can be reduced and the spine to the coating of wax or Silica. Examples? Opumtia polardii.
5.Leaves leaves the thickness of the pipeline network. In some cases, stem green leaves are flat and full form. phyllodes Example? Acacia auriculiformis.
6.Many xerophytic plants show trichophylly. Mouthguard to protect the cells of the leaves. stong wind samples? numularis Zizyphus.
7.Leaves xerophytic grass. Some large capacity for turning and folding
D fruit) and seed
Flowers tend to develop in good condition and Propagation within a short time. Time of fruit and seed is protected by hard coverings, and it remains dormant for a long time
Adaptation Anatomy.
1.Epidermal. The cells are compact with thick cuticle and a single layer.
2.Wax instead. Resin, Cellulose as silver on the surface the epidermis is protected. Measure the intensity of light, high
3.Some epidermal cells is found in depression as a cell called expand more vehicles or hinge Cells. Congratulates rotation of the leaf of a vehicle during the dry season examples? Amnophilla.
4.The hypodermal cell wall thickness and the manufacturers and may contain tannin, and rubber.
Number per unit area 5.Stomatal down, and they are the answer. Cell wall and cell protection. Cutinized difficult and its subsidiaries have lignified stomata. Only reduces the evaporation.
is 6.In with reduced leaf photosynthetic activity up to Chlorenchymatous cortex samples? Capparis decidua.
7.In succulent stem tissue surface is filled with some walls. Parenchymal cells collected on quanitity plasma. Rubber samples? Agave americana.
8.The mesophyll cell very small space inside the cell decreased. Palisade tissue development. surrounded in several layers and in some cases the mesophyll by a sheath of sclerenchyma.
9.In Kiefer Mesophyll cells in a cell full of sp starlike
10.Both xylum and phloem tissues are well advised to develop. Xerophytes.
Chart [C] for the blog Link below.
Physiological adaptation
Xerophytes with a high osmotic pressure increased. Turgor of the cells are property exerts force on the cell wall. How do sear the cell.
2 per cuticle, stomata can answer my mouth to prevent leakage control.
3 xerophytes ability in survive the dry season, is not only structural properties. But even in the resistance of life in the cells of animals and plants in the heat and dehydration.
4 Some Enzymes such as catalase, peroxidases. Have the xerophytes low concentration of the enzyme using hydrolytic rate of protection than water. Consumption
5 change in chemical cells xerophytes Property such as polysaccharides. No water in the form of cellulose etc suberin as indicated.
6 In some xerophytes stomata are open at night and stay during the day closed. These features with abnormal metabolic activity of plants are associated
7 in these plants. Some polysaccharides are converted. Pentoses is the capacity building Water
8 of respiratory xerophytes carbon dioxide emissions in the night on the synthesis of organic acids led many useful. For facilities that in most conditions Draft survive.
Heat Shock Protein.
Heat. Shock proteins (HSP) is a group of proteins. With an increased expression on cells exposed to high temperatures or other stress. This increase in expression. This up-regulation of the drama warm transcriptionally controlled mainly protein heat caused by factors (HSF) is an important part of the response to heat shock.
HSPs have a molecular weight of. For example, Hsp60, Hsp70 and Hsp90 (HSP far. - Education) family of proteins related to heat up, small 60, 70 and 90 kD, or 8 marks ubiquitin, which kilodalton protein. For protein degradation are able to warm up proteins.
Molecular chaperones and heat-shock protein (HSP) are ubiquitous features of cell proteins. Cope with the stress. Denaturation of other proteins have most of Hsps live in a stress test phase in the laboratory and function of interest have been the molecular and cellular Hsps are to be understood better in this context. Strengthening the emerging Hsps focus of the model and a life not in the role of stress in nature. HSP stress physiology. multicellular eukaryotes, and all tissues and organs, and include the ecological and coded evolutionary relationships of the changes in HSM and the genes. Focus means. (Expression) of HSP may occur in nature. (B) all the HSP gene, but differ in their expression. (C) HSP expression may have a relationship. Are resistant to stress and (D) criteria for the type of expression. HSP correlated with the extent the burden they happen naturally. These conclusions better now and can be used. Confirmed a little more, important question is not about the two mechanisms stress tolerance. HSP - mediated mechanism, evolution and organismal level, diversity of genes HSP.
Upregulation. By stress.
Production of high protein-ups can be triggered by heat, open to different environmental stress conditions. Such as infection, inflammation, exercise, exposure to toxic substances in the cells. (Ethanol, arsenic, trace elements and UV light, among others. Other) diet, lack of oxygen (oxygen deficiency). Deprivation and nitrogen. (The plant) or the water warm, so protein is also known as stress proteins, and referred Sometimes described upregulation than usual. As part of the response to stress.
Impact of ABA in stress.
stress-response gene to control -. process and the ABA ABA - independent
Decoding the genetic control by the interaction of proteins with specific regulations in the promoter sequence of the genes that control different gene from the same pathway is controlled by signals.
Runs to activate these factors. only the transcription of the gene promoters of several stress can lead to sequence-specific regulatory genes associated with different strength. For example, the RD29 DNA sequence of genes. Can be used by the osmotic stress and cold. ABA.
Effects of ABA in the leaves closed Mouth, dry conditions.
Graph [D] for the blog link below.
Acidity, alkalinity and salinity of the soil are important Factors in production
Because the acidity of the soil, the physical availability of plant nutrients and some biological activity of the soil is more effective for the growth of plants in acid soils to the concentration of H + ions in water, soil dissolved neutral ground concentrations. H + ions around one million parts of water and acidic soil, a concentration of H + at 100 to 100 times higher than the base concentration. H + ions.
PH is not very not very suitable for the growth of plants, or most other soils. Such conditions also in the loss of air and nutrients in the soil, although some species in acidic or alkaline soils for most Plants grow best in neutral or slightly acidic to grow. Soil only quarter (26%).
The world's land suitable for cultivation classified as an acid in the tropics is greater as%. (43%), soil pH accounts for 68% of tropical America, 38% of tropical Asia and
27% of tropical Africa.
Chart [E] for the blog link below.
Improvement
crop). TO improve resistance to water deficit.
Drought resistance is the objective of improving the plant breeders.
Four basic methods. Drought tolerance are used. .
1.breed yield under optimal conditions, species such as the potential for productivity gains. - Assuming this is on condition benefit suboptimal.
2.breed for maximum yield in the target environment.
3.Select and include morphological and physiological mechanisms of drought tolerance in traditional breeding programs.
4.do not several criteria, but the body is no doubt that the drought resistant to receive compensation under the condition, and limited water and formed. Improvement of existing products.
Many molecular techniques for gene study it was found that provide resistance to water deficit. Some of the genes may be. Plants and plant, productivity improved by drought. First enzyme synthesis osmoprotectants. Small molecules that is expressed in the cytoplasm of plant drought stress accumulate.
Plants are genetically very drought resistant genes enzymes. Two genetic factors. Transcription. Set encoding. all the metabolic pathways that lead to the adaptation to drought, have been identified. The same gene combination can look forward to growing cereals and effectively to a lack of water and more. Any process of development.
) Better performance in the B-salt.
Salt tolerance is a complex gene, volume control. Several genes recently some genes that provide useful information in screening for salt tolerance and programs offer selected identified.
Four important to develop salt tolerant stratergies. Plant is.
1.gradually improve salt tolerance breeding and selection for general
As the development of salt tolerance in rice. (Pokkali rice) from Kerala, India, widely used to improve salt tolerance in other areas. What you need additional rice genes.
2.Introduce characteristics of the Salt tolerance from wild relatives to cross the plant process.
Example: tomato (Lycopersicon esculentum).
Barley (Hordeum vulgare) and wheat (Triticum aestivum).
3.Domesticate. This species lives in salt water environments. (Halophytes) by breeding and selection for improved agricultural properties.
4.Use molecular techniques to identify genes associated with salt tolerance and promotes expression in plants. Or the transmission of genes from plants, not the species. For example, in the molecules of the genes involved in salt sensing in the environment (Relay - signal) to initiate genes for transcription factors, the other battery of genes. These provide the cells resistant to higher flow rates, salt and genes that are part of the adaptation of plants for the salt are discussed. After a sample of the gene. encoded may apply to a plant vacuolar sodium pump genes in cells change quickly when exposed to the salt can transport salt from the cytoplasm to vacuole is by Cytoplasm toxic. Example: Lycopersicon esculentum, tomato ().
CONCULSION.
Standards and discipline. GM is, how to set and to expect that body to increase resistance and yield of crops. People have used a new generation of knowledge. And physiology of yield accumulation and physiological basis of genetic changes in salt-resistance and the type of design has the potential for increasing the efficiency of basic foodstuffs. Plants in an environment specifically different. Physiological knowledge and tools effectively.
Blog Address: http://stresstolerance.blogspot.com/.
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