Role of organic acids in enhancing the desorption and uptake of weathered p,p′-DDE by Cucurbita pepo

2003 ◽  
Vol 124 (1) ◽  
pp. 71-80 ◽  
Author(s):  
Jason C. White ◽  
MaryJane Incorvia Mattina ◽  
Wen-Yee Lee ◽  
Brian D. Eitzer ◽  
William Iannucci-Berger
Keyword(s):  
Organic Acids ◽  
Cucurbita Pepo

Leaf free space analysis and vein loading in Cucurbita pepo

1981 ◽  
Vol 59 (12) ◽  
pp. 2550-2557 ◽  
Author(s):  
Monica Madore ◽  
John A. Webb
Keyword(s):  
Amino Acids ◽  
Organic Acids ◽  
Free Space ◽  
Cucurbita Pepo ◽  
Appreciable Amount ◽  
Minor Vein ◽  
Rapid Accumulation ◽  
Ethanol Extracts ◽  
Symplastic Pathway

To determine the role of the apoplast in the loading of the minor veins of Cucurbita pepo L., leaves were examined either for the ability to release selectively the transport sugars, sucrose and stachyose, from the metabolic space (MS) to the free space (FS) or to accumulate selectively exogenously fed transport sugars from the FS into the minor veins. FS extracts collected by vacuum infiltration and centrifugation of specially trimmed leaves were found to contain all sugars also present in ethanol extracts of the MS of the same leaves, but in amounts two orders of magnitude lower. Similarly, 14C activity in FS extracts from 14CO2-labelled leaves, which was distributed between all sugars, amino acids, and organic acids also found labelled in the MS, was nearly three orders of magnitude lower than in MS ethanol extracts. No excess of the transport sugars was evident in FS extracts. When 14C-labelled sucrose, stachyose, or galactose (all 1–2 mM) were infiltrated into the FS a rapid accumulation of these sugars into the mesophyll was apparent, as all sugars were rapidly interconverted into the various sugars normally found labelled in the MS after exposure of leaves to 14CO2. However, while leaves exposed to 14CO2 translocated label predominantly in the form of [14C]stachyose, label in exogenously fed leaves was translocated predominantly as [14C]sucrose, irrespective of the nature of the fed sugar. Exogenously fed transport sugars did not therefore appear to be taken up directly into the minor veins from the FS.The absence of significant levels of transport sugars in the FS as well as the failure of C. pepo leaves to load any appreciable amount of exogenously supplied [14C]stachyose, the predominant transport sugar in this species, would tend to preclude both a selective release of transport sugars into the apoplast and a selective uptake of transport sugars from the apoplast into the minor veins. A completely symplastic pathway for minor vein loading in C. pepo leaves therefore remains a possibility.

After-Cooking Discoloration of Potatoes Role of the Organic Acids

1964 ◽  
Vol 29 (5) ◽  
pp. 555-564 ◽  
Author(s):  
E. G. HEISLER ◽  
JAMES SICILIANO ◽  
C. F. WOODWARD ◽  
W. L. PORTER
Keyword(s):  
Organic Acids

scholarly journals Role of Organic Acids on Phosphorus Fractions in Silty Clay Loam Soil

2018 ◽  
Vol 8 (2) ◽  
pp. 12-21
Author(s):  
Abdulmahdi S.ALansari ◽  
Muhammad M.Yassin ◽  
Mahdi W.Seheib
Keyword(s):  
Humic Acid ◽  
Organic Acids ◽  
Incubation Period ◽  
Total Phosphorus ◽  
Phosphate Fertilizer ◽  
Silty Clay ◽  
Clay Loam ◽  
Silty Clay Loam ◽  
Fertilized Soil

This study was conducted to evaluation the role of the organic acids in the phosphorus fractions in silty clay loam texture. The laboratoryexperiment was conducted by adding the organic acids (Humic acid ,Citric acid ,Oxalic acid , Malic acid ,Acetic acid and Lactic acid )to the fertilized soil with conc. super phosphate fertilizer with 100 kg h-1 level with concentrations (0,15,30,45 and60)mg L-1,except Humic acid (500,1000,1500 and 2000) mg L-1.The soil was incubated at 30 C for 14,28,42,56 and 70 days period and the keep of field capacity about of incubation period during the daily weight.Amount of available ,mineral ,organic and total phosphorus after each incubated period were measured. The results showed that theaddition of organic acids of Humic acid ,Citric acid ,Oxalic acid and Malic acid were caused to increaseamount of available ,mineral ,organic and constant of total phosphorus in fertilized soil with conc. super phosphate fertilizer and increased its amount with increasing of organic acid concentration and better of Humic acid 2000mg L-1 significanton all the treatments .The results of the study that theaddition of organic acids were caused to increase amount of available and mineral phosphorus with increasing of incubation period and constant amount of total phosphorus and decreasing of organic phosphorus amount and available for only soil and only fertilizer treatment during increasing of incubation period .The organic acids can be arranged according to its ability toincrease the availabilityof the phosphorus as follow :

scholarly journals Organic compounds in root exudates of Miscanthus × Giganteus greef et deu and limitation of microorganisms in its rhizosphere by nutrients

2010 ◽  
Vol 58 (5) ◽  
pp. 203-208 ◽  
Author(s):  
Hana Kaňová ◽  
Joffrey Carre ◽  
Valerie Vranová ◽  
Klement Rejšek ◽  
Pavel Formánek
Keyword(s):  
Organic Acids ◽  
Organic Compounds ◽  
Respiration Rate ◽  
Root Exudates ◽  
Plant Nutrients ◽  
Rhizospheric Soil ◽  
Polluted Soils ◽  
Rhizosphere Microorganisms ◽  
Miscanthus Giganteus

This study was conducted to determine the composition of sugars and organic acids in root exudates of Miscanthus × Giganteus and to find out if microorganisms of the rhizospheric soil are limited by mi­ne­ral nutrients. The following sugars and organic acids were determined in root exudates of this plant: glucose, saccharose, and acids such as succinic, propionic, citric, tartaric, malic, oxalic, ascorbic, acetic and fumaric. Respiration of soil from rhizosphere of Miscanthus × Giganteus was found to be limited by N, K and Ca. Respiration rate after application of mineral compounds increased in following orther: nitrate > calcium > potassium > ammonium, giving approx. 165, 99, 52 and 31 % increase compared to control. Further research is necessary to determine the role of plant nutrients from the point of their limitations for rhizosphere microorganisms, to broader very rare knowledges in this topic, especially for polluted soils to stimulate efficiency of phytoremediations.

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