The Effects of Salinity on Nitrogen Fixation and Trehalose Metabolism in Mycorrhizal Cajanus cajan (L.) Millsp. Plants

Garg, Neera; Chandel, Shikha

doi:10.1007/s00344-011-9211-2

Cited by 36 publications

(21 citation statements)

References 73 publications

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“…, Cland Cd 2? uptake as well as their translocation from roots to shoots is remarkably reduced in plants inoculated with AM fungus, F. mosseae even at highest stress levels (Garg and Chandel 2011). In the present study, AM fungus prevented transport of Na ?…”

Section: 05) As Determined By Dunnett's Multiple Comparison Testsupporting

confidence: 45%

“…Asterisk significant difference between exposed and control plants (p\0.05) as determined by Dunnett's multiple comparison test Plant Growth Regul values of this parameter were obtained in Sel 85N. It has been suggested that negative effect of salinity on plant growth could be a consequence of the decline in the nitrogen-fixation process and vice versa (Garg and Chandel 2011). The environmental stress-induced nodule senescence develops much more rapidly than developmental senescence and presents features of oxidative stress (Garg and Manchanda 2008;Mhadhbi et al 2011).…”

Section: Discussionmentioning

confidence: 95%

“…Moreover, symbiosis and nodule functions are very sensitive to oxidative stress induced by salt and Cd stresses, more so than the host legume or the free living rhizobia (Garg and Manchanda 2008;Melchiorre et al 2009;Jebara et al 2010;Garg and Chandel 2011;Garg and Bhandari 2012). Legumes usually exhibit considerable dependence on mycorrhiza for adequate supply of P, which further enable them to thrive under stressed environments.…”

Section: Introductionmentioning

confidence: 99%

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Role of arbuscular mycorrhiza in arresting reactive oxygen species (ROS) and strengthening antioxidant defense in Cajanus cajan (L.) Millsp. nodules under salinity (NaCl) and cadmium (Cd) stress

Garg

Chandel

2014

Plant Growth Regul

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Application of phosphate fertilizers and biosolids enhances Cd contamination in arid and semi-arid regions. Increased concentration of dissolved chloride (Cl -) in saline solution increases Cd solubility and bioavailability. Nodules are soft targets for NaCl and Cd stresses due to adverse effects on their functioning. Arbuscular mycorrhizal (AM) fungi enhance plant growth in contaminated sites. Greenhouse experiments were conducted to evaluate the efficacy of Funneliformis mosseae in arresting toxic ion transport and ROS generation in pigeonpea nodules and its role in improving membrane structure and antioxidant defense. Two genotypes (Sel 85N; tolerant and ICP 13997; sensitive) were subjected to NaCl (4, 6 dS m -1 ) and Cd (CdCl 2 -25, 50 mg Kg -1 dry soil) treatments. Results indicated higher phytotoxicity of Cd than NaCl which aggravated when NaCl was added along with Cd. Increment in toxic ions caused injury to nodular membranes and increased oxidative stress (H 2 O 2 and MDA), higher in ICP 13997 than Sel 85N. Significant increase in non-protein thiols (NP-SH) and PC levels was observed under Cd and NaCl ? Cd treatments. The rapid generation of ROS was counteracted by AM-induced enzymatic activities (SOD, POD, CAT and GR), nonenzymatic components (GSH-GSSG cycling, their ratio and total glutathione) and glutathione-mediated PC synthesis.

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Section: 05) As Determined By Dunnett's Multiple Comparison Testsupporting

confidence: 45%

Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Role of arbuscular mycorrhiza in arresting reactive oxygen species (ROS) and strengthening antioxidant defense in Cajanus cajan (L.) Millsp. nodules under salinity (NaCl) and cadmium (Cd) stress

Garg

Chandel

2014

Plant Growth Regul

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“…Besides antioxidant enzymes, soluble sugar are accumulated under different abiotic stress (Ashraf and Foolad, 2007;Garg and Chandel, 2011). The increased soluble sugar content was consistent with previous studies of Irigoyen et al (1992) for water stress in nodulated alfalfa plants.…”

Section: Figsupporting

confidence: 78%

Cross Adaptation Tolerance in Rice Seedlings Exposed to PEG Induced Salinity and Drought Stress

Ma¹,

Wang²,

Yingxue³

et al. 2016

IJAB

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The present study investigated the effects of polyethylene glycol (PEG) on rice (Oryza sative L.) seedlings for physiological and biochemical response exposed to subsequent salinity or polyethylene glycol and NaCl (as drought) stress. Salinity or drought induced stress decreased growth-significantly (p<0.05) reduced pigment content, stomatal conduction (gs), transpiration (E) and net photosynthetic rate (Pn), whereas no significant change in intercellular CO2 concentration (Ci) was recorded relative to controls. NaCl+PEG stress also reduced POD activity. MDA content and total soluble sugar content increased significantly (p<0.05) under NaCl or NaCl+PEG induced stress. Chlorophyll fluorescence decreased significantly in NaCl-treated plants. However, positive effects were observed in PEG pre-treated (PEG-NaCl, PEG-NaCl+PEG) rice seedlings than NaCl or NaCl+PEG-treated ones. PEG pre-treatment promoted rice seedlings growth and regulation capacity in rice seedlings tolerance to NaCl or drought stress by increase in plant biomass, chlorophyll contents, chlorophyll fluorescence, photosynthetic parameters and antioxidative enzymes activities. The positive effects to the pre-treatment of rice seedlings suggested that cross-adaptation of PEG pre-treatment mediated protection of salinity and drought stress.

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“…In contrast, in nodulated pigeonpea plants, salinity led to an increase in trehalose-6-P synthetase and trehalose-6-P phosphatase activities resulting in increased trehalose content in nodules, which was accompanied by inhibition of trehalase activity, the catabolizing enzyme. Arbuscular mycorrhizal pigeonpea plants had lower trehalase activity under both control and saline conditions (Garg and Chandel 2011 ) . More investigations are required for study of the accumulation of trehalose in extraradical hyphae and mycorrhizal roots in order to evaluate the potential of trehalose in protecting AM plants from salt stress.…”

Section: Soluble Sugarsmentioning

confidence: 99%

Role of Arbuscular Mycorrhiza in Amelioration of Salinity

Hajiboland

2013

Salt Stress in Plants

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Soil salinity is world wide problem because it negatively affect plant productivity and yield of plants particularly in arid and semi-arid regions of the world. Excessive salts decline soil water availability for plants, inhibit plants metabolism and nutrients uptake and is also responsible for osmotic imbalance. All of these changes contribute to stunted growth and less productivity of plants. Exploitation of soil microorganisms for utilizing salt affected soils is of considerable interest to plant and soil scientists. Arbuscular mycorrhizal fungi (AMF) are ubiquitous soil microorganisms inhabiting the rhizosphere and establish a symbiotic relationship with the roots of many plants. Arbuscular mycorrhizal fungi are from integral components of all natural ecosystems and are known to occur in saline soils. Symbiotic association of a plant with AMF results in higher ability for taking up the immobile nutrients in nutrient-poor soils as well as improvement of tolerance to salinity. The possible mechanisms for alleviation of salinity stress by AMF include: (1) improvement of plant nutrient uptake, particularly P, (2) elevation of K:Na ratio, (3) providing higher accumulation of osmosolutes, and (4) maintaining higher antioxidant enzymatic activities. In addition, some aquaporin genes are upregulated in mycorrhizal plants, causing signi fi cant increase in water absorption capacity of salt-affected plants. In contrast, expression of proline biosynthetic enzymes and LEA genes as stress indicators are maintained in mycorrhizal salt stressed plants suggesting that mycorrhizal plants are less susceptible to salinity because of salinity-avoidance mechanisms.

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The Effects of Salinity on Nitrogen Fixation and Trehalose Metabolism in Mycorrhizal Cajanus cajan (L.) Millsp. Plants

Cited by 36 publications

References 73 publications

Role of arbuscular mycorrhiza in arresting reactive oxygen species (ROS) and strengthening antioxidant defense in Cajanus cajan (L.) Millsp. nodules under salinity (NaCl) and cadmium (Cd) stress

Role of arbuscular mycorrhiza in arresting reactive oxygen species (ROS) and strengthening antioxidant defense in Cajanus cajan (L.) Millsp. nodules under salinity (NaCl) and cadmium (Cd) stress

Cross Adaptation Tolerance in Rice Seedlings Exposed to PEG Induced Salinity and Drought Stress

Role of Arbuscular Mycorrhiza in Amelioration of Salinity

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