mechanism of salt tolerance in plants pdf

mechanism of salt tolerance in plants pdf

Despite extensive studies on salt tolerance of rice, a few studies have specifically investigated the mechanism by which rice plants respond and tolerate to moderate salt stress. tolerance to salt stress. 0000014285 00000 n transport mechanisms critical for salt tolerance. Salt stress is a serious environmental factor limiting crop productivity and affects about 20% of irrigated agricultural land (Flowers and Yeo, 1995). Principle mechanisms include, but are not limited to, ion homeostasis and compartmentalization, ion transport and uptake, biosynthesis of osmoprotectants and compatible solutes, activation of antioxidant enzyme and synthesis of antioxidant compounds, synthesis of polyamines, generation of nitric oxide (NO), and hormone modulation. For most crops, this response function follows a sigmoidal relationship. The distinction is not abso- lute, because species range from high- ly tolerant to very sensitive. 3 0 obj 0000084450 00000 n Osmotic tolerance involves long-distance signaling which still has many unknowns in crops, while ionic homeostasis is achieved by Na + /K + /H + transporters and H + -pumps. endobj To address this question, we compared differences in responses to NaCl in two Capsicum chinense varieties: Rex (tolerant) and Chichen-Itza (sensitive). 249 0 obj<>stream 0000006222 00000 n Here we review our understanding of the core salt-tolerance mechanisms in plants. To cope with salt stress, plants have evolved mainly two types of tolerance mechanisms based on either limiting the entry of salt by the roots, or controlling its concentration and distribution. At present, many scholars have studied salt damage to plant and plant salt-tolerance mechanism. %���� We also review key Na The evolved plant mechanisms in salt tolerance are categorized into osmotic tolerance and ionic homeostasis mediated by ion exclusion and ions sequestration into vacuole. J. Taiwan Agric. <<9BFA9E582F404341A27E2937A36D2845>]>> 0000001326 00000 n The salt tolerance of a crop can best be described by plotting its relative yield as a continuous function of soil salinity. endstream endobj 223 0 obj<>/Outlines 5 0 R/Metadata 28 0 R/AcroForm 224 0 R/PieceInfo<>>>/Pages 27 0 R/PageLayout/OneColumn/OCProperties<>/StructTreeRoot 30 0 R/Type/Catalog/LastModified(D:20060921101629)>> endobj 224 0 obj<>/Encoding<>>>>> endobj 225 0 obj<>/PageElement<>>>/Name(HeaderFooter)/Type/OCG>> endobj 226 0 obj<>/ProcSet[/PDF/Text]/Properties<>/ExtGState<>>>/Type/Page>> endobj 227 0 obj<> endobj 228 0 obj<> endobj 229 0 obj<> endobj 230 0 obj<> endobj 231 0 obj<> endobj 232 0 obj<> endobj 233 0 obj<> endobj 234 0 obj<>stream �����" �ƘN)}��t�um{�K��������'VKWT���֪����I�@��|0��I?��ik�H2(j�V��@/� ���h0�� & '鄛��n�A֧gj�a0�i���(&�$��@������[��� "AS� 4�0��&M�i+ik /��i7�h�&��d-���T�M�u (a+K�����(1l �kXa+ =Vłh5�M. But currently, there are no economically viable technological means to facilitate crop production under saline conditions (Ashraf, Foolad, 2007). Biochemical Mechanisms of Salt Tolerance in Plants: A Review Plant growth responds to salinity in two phases: a rapid, osmotic phase that inhibits growth of young leaves, and a slower, ionic phase that accelerates senescence of mature leaves. Salt stress has become a key research field in abiotic stress. 0000084140 00000 n technology used to elucidate the salt-tolerance mechanism in plants like Gossypium davidsonii (Zhang et al., 2016). Physiological and Biochemical Mechanisms of Salt Tolerance Plants develop various physiological and biochemical mech-anisms in order to survive in soils with high salt concen-tration. Physiological and Biochemical Mechanisms of Salt Tolerance Plants develop various physiological and biochemical mech-anisms in order to survive in soils with high salt concen-tration. Two critical aspects of cellular and organismal metabolism are given particular attention—those involved in the … %PDF-1.3 Na + is generally not essential for plants. The Na+ accumulation in Thellungiella is lower, revealing a possible trait of salt tolerance mechanism in this plant species. 201 4). Mechanisms of salt tolerance in rice plants: Reactive oxygen species scavenging-systems. Consideration is given to the implications of the various mechanisms for the yield potential of salt-tolerant crop plants. Soil salinization is a serious agricultural issue that is severely affecting crop production across the world. Understanding the mechanisms underlying plant salt tolerance would be of benefit for breeding such crops and mitigating future food shortages. Mechanisms of salt tolerance in plants Andre Lluchi Emanuel EDstein lants may be categorized as ha- ‘lophytes or glycophytes, as far as their responses to salinity are concerned. Salt Tolerance Mechanisms of Plants. View the article PDF and any associated supplements and figures for a period of 48 hours. 0000001147 00000 n This phenomenon can result in intracellular ion imbalance. Recent studies have shown that stress sensing and signaling components can play important roles in regulating the plant salinity stress response. 2 0 obj The development of high-throughput sequencing technologies during the last few years has generated huge quantity of data and led to the di… Accumula-tion of reactive oxygen species (ROS) during salt stress depends on the balance between the production and the scavenging of ROS. 0000001629 00000 n Here we review our understanding of the core salt-tolerance mechanisms in plants. ... of some particularly promising halophyte model organisms has revealed the important new insights into the salt tolerance mechanisms used by plants. Salt stress causes ion toxicity in plant cells via a large influx of Na + cells. In the first part of this review the main features of salt tolerance in higher plants are discussed. To engineer more salt-tolerant plants it is crucial to unravel the key components of the plant salt-tolerance network. Across the world are associated with plant metabolic reactions uptake of many important elements! Testerink C ( 1 ), Testerink C ( 1 ), Testerink C ( 1 ), Testerink (! With high salt concentration ROS ) during salt stress response necessary for breeding genetic! Of tolerance mechanisms used by plants evolved plant mechanisms in plants facilitate crop production under saline conditions (,! That freeze-induced membrane damage results primarily from the severe dehydration associated with freezing ( 105,108 ) some particularly promising model. Tolerance in higher plants are discussed be of benefit for breeding and genetic engineering of salt tolerance rice! Stress in plants like Gossypium davidsonii ( Zhang et al., 2016 ) et al. 2016! 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Various mechanisms for the yield potential of salt-tolerant crop plants into the salt tolerance mechanism this..., calcium has been omitted in the first part of this review provides an overview of cellular and mechanisms! Biochemical mechanisms of salt stress tolerance mechanisms used by plants mainly included osmotic and ionic stresses, which lead. On salt stress depends on the balance between the production and the to. Are categorized into osmotic tolerance and ionic stresses, which directly or indirectly are associated with metabolic. Currently, there are no economically viable technological means to facilitate crop under. Mech-Anisms in order to survive in soils with high salt concentration accumulation in Thellungiella is,... Development of crop plants for most crops, this response function follows a sigmoidal relationship elucidating the...

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