Oxalic Acid/Oxalates in Plants:From Self-Defence to Phytoremediation

Prasad, Rajendra; Shivay, Yashbir Singh

doi:10.18520/cs/v112/i08/1665-1667

Cited by 52 publications

(37 citation statements)

References 42 publications

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“…Nagy et al [92] conclude that trees induce the formation of reaction zones that possess antimicrobial properties, such as elevated pH and cation content; pathogens lower substrate pH by secreting oxalic acid, with its conjugate base oxalate being a reducing agent t as well as a chelating agent for cations. On the other hand, Prasad and Shivay [110] showed that both oxalic acid and calcium oxalate possess plant properties against wood-consuming organisms-both insect pests and grazing animals. We are convinced that this mechanism is also involved in fungal resistance to invertebrates, as suggested by Binns [111] and White [112].…”

Section: Impact Of Biotic Interactionsmentioning

confidence: 99%

Why Does Phlebiopsis gigantea not Always Inhibit Root and Butt Rot in Conifers?

Żółciak

Sikora

Wrzosek

et al. 2020

Forests

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This review aims to identify possible causes of differing effectiveness of artificial biological control of Heterobasidion root rot by the saprotrophic fungus Phlebiopsis gigantea. We describe published information in terms of pathogen–competitor relationships and the impact of environmental and genetic factors. We also revisit data from original research performed in recent years at the Forest Research Institute in Poland. We hypothesized that, in many cases, competition in roots and stumps of coniferous trees between the necrotrophic Heterobasidion spp. and the introduced saprotroph, Phlebiopsis gigantea, is affected by growth characteristics and enzymatic activity of the fungi, the characteristics of the wood, and environmental conditions. We concluded that both wood traits and fungal enzymatic activity during wood decay in roots and stumps, and the richness of the fungal biota, may limit biological control of root rot. In addition, we identify the need for research on new formulations and isolates of the fungal competitor, Phlebiopsis gigantea, as well as on approaches for accurately identifying the infectious threat from pathogens.

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Section: Impact Of Biotic Interactionsmentioning

confidence: 99%

Why Does Phlebiopsis gigantea not Always Inhibit Root and Butt Rot in Conifers?

Żółciak

Sikora

Wrzosek

et al. 2020

Forests

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“…Calcium absorption and oxalic acid synthesis can play an important role in sweet potato ion balance and osmoregulation. This is achieved through the regulation of excess calcium ions by their precipitation with oxalic acid, in the form of druse CaOx crystals – i.e., spherical aggregate of individual crystals . These crystals commonly occur inside the vacuoles of specialized cells, i.e., crystal idioblasts, and can participate in the storage of calcium as CaOx .…”

Section: Discussionmentioning

confidence: 99%

“…The oxalic acid [(COOH) 2 ] can form insoluble salts when combined with calcium (Ca 2+ ) . The CaOx content can vary during the plant growth period, usually associated with plant genetics, nutrient assimilation, or drought …”

Section: Introductionmentioning

confidence: 99%

Changes in oxalate composition and other nutritive traits in root tubers and shoots of sweet potato (Ipomoea batatas L. [Lam.]) under water stress

et al. 2019

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BACKGROUND: The presence of insoluble calcium oxalate druse crystals (CaOx) in sweet potato (Ipomoea batatas) can negatively affect its nutritional quality. Photosynthesis, starch, and protein composition are linked with oxalate synthesis and tuber quality under water scarcity. Our main objective was the oxalate quantitation of sweet potato tubers and shoots and also to assess how drought changes their nutritional value. Eight sweet potato accessions from Madeira, the Canaries and Guinea-Bissau were analyzed for their response to drought stress. Tubers and shoots were analyzed for total (T-Ox), soluble (S-Ox) and insoluble (CaOx) oxalates, protein, chlorophyll content index (CCI), soluble starch, starch swelling power, and starch solubility in water. RESULTS: The S-Ox and CaOx content was higher in shoots. Six accessions were above maximum CaOx levels for raw consumption. Accessions with more favorable responses to drought had decreased CaOx with S-Ox increase content for osmoregulation.They also presented slightly decreased CCI and protein contents. These accessions also had an increased shoot starch content, for further tuber storage starch hydrolysis, and maintained the quality and functional properties of the tuber starch grain. Those with a less favorable response to drought had a higher T-Ox and CaOx content in both organs, hindering water absorption. They also had decreased protein and CCI, with a slight increase in tuber starch hydrolysis. CONCLUSION: Oxalate content was significantly related to carbohydrate metabolism, CCI, and protein synthesis. This study significantly contributed to the screening of the sweet potato stress response to drought, to adapt this crop to climatic change through breeding programs.

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“…Calcium oxalate occurs in the cells of many plants, from microscopic algae to giant gymnosperms, and in cyanophytes and fungi [ 47 , 48 , 49 ]. Formed from glucose by an enzymatic process, calcium oxalate may accumulate to form considerable quantities of crystals within individual cells, a phenomenon that may provide physical protection against predation [ 50 ]. Metabolically, calcium oxalate is a mechanism for regulating calcium levels in tissues and organs [ 51 , 52 ].…”

Section: Previous Workmentioning

confidence: 99%

Biogenic Weathering: Solubilization of Iron from Minerals by Epilithic Freshwater Algae and Cyanobacteria

Mustoe

2018

Microorganisms

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A sandstone outcrop exposed to freshwater seepage supports a diverse assemblage of photosynthetic microbes. Dominant taxa are two cyanophytes (Oscillatoria sp., Rivularia sp.) and a unicellular green alga (Palmellococcus sp.). Less abundant taxa include a filamentous green alga, Microspora, and the desmid Cosmarium. Biologic activity is evidenced by measured levels of chlorophyll and lipids. Bioassay methods confirm the ability of these microbes to dissolve and metabolize Fe from ferruginous minerals. Chromatographic analysis reveals citric acid as the likely chelating agent; this low molecular weight organic acid is detectable in interstitial fluid in the sandstone, measured as 0.0756 mg/mL. Bioassays using a model organism, Synechoccus elongates strain UTEX 650, show that Fe availability varies among different ferruginous minerals. In decreasing order of Fe availability: magnetite > limonite > biotite > siderite > hematite. Biotite was selected for detailed study because it is the most abundant iron-bearing mineral in the sandstone. SEM images support the microbiologic evidence, showing weathering of biotite compared to relatively undamaged grains of other silicate minerals.

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Oxalic Acid/Oxalates in Plants:From Self-Defence to Phytoremediation

Cited by 52 publications

References 42 publications

Why Does Phlebiopsis gigantea not Always Inhibit Root and Butt Rot in Conifers?

Why Does Phlebiopsis gigantea not Always Inhibit Root and Butt Rot in Conifers?

Changes in oxalate composition and other nutritive traits in root tubers and shoots of sweet potato (Ipomoea batatas L. [Lam.]) under water stress

Biogenic Weathering: Solubilization of Iron from Minerals by Epilithic Freshwater Algae and Cyanobacteria

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