Microbial and hydrolase activity after release of indoleacetic acid and ethylene–polyamine precursors by a model root surface

2011 ◽  
Vol 47 (2) ◽  
pp. 106-110 ◽  
Author(s):  
Giancarlo Renella ◽  
Loretta Landi ◽  
Jose M. Garcia Mina ◽  
Laura Giagnoni ◽  
Paolo Nannipieri
Keyword(s):  
Indoleacetic Acid ◽  
Root Surface ◽  
Hydrolase Activity

Peroxidase associated with the root surface of Phaseolus vulgaris

1986 ◽  
Vol 64 (3) ◽  
pp. 573-578 ◽  
Author(s):  
F. G. Albert ◽  
L. W. Bennett ◽  
A. J. Anderson
Keyword(s):  
Hydrogen Peroxide ◽  
Superoxide Anion ◽  
Indoleacetic Acid ◽  
Root Surface ◽  
Acid Oxidase ◽  
Peroxide Formation ◽  
Optimal Activity ◽  
Indoleacetic Acid Oxidase ◽  
Hydrogen Peroxide Formation ◽  
Intact Roots

The surface of bean roots demonstrates an intense peroxidase activity which was detected by hydrogen peroxide dependent formation of chromogen from chloronaphthol or dianisidine. Other peroxidase functions, oxidation of indoleacetic acid and NADPH, were catalysed by intact roots and were stimulated by Mn2+ and p-coumarate. Oxidation of NADPH involved superoxide anion [Formula: see text] and hydrogen peroxide formation. Molecular sizing chromatography of root washes demonstrated NADPH oxidase and peroxidase to be associated with higher weight components than indoleacetic acid oxidase. Root surface and root wash peroxidase displayed optimal activity between pH 7 and 8, whereas both sources of indoleacetic acid oxidase were more active at acidic pH. Native poly aery lamide gel electrophoresis of sterile root washes displayed two fast-moving anodic bands, whereas homogenates of the plant roots had several slower moving bands in addition.

Effectiveness of complex inoculation of spring wheat with N[2] -fi xing bacteria Azospirillum brasilense and mold-antagonist Chaetomium cochliodes

2014 ◽  
Vol 1 (3) ◽  
pp. 57-61
Author(s):  
E. Kopylov
Keyword(s):  
Spring Wheat ◽  
Root Zone ◽  
Wheat Root ◽  
Root Surface ◽  
Atmospheric Nitrogen ◽  
Rhizospheric Soil ◽  
Chain Reaction ◽  
Wheat Roots ◽  
Chlorophyll A And B ◽  
Polymerase Chain

Aim. To study the specifi cities of complex inoculation of spring wheat roots with the bacteria of Azospirillum genus and Chaetomium cochliodes Palliser 3250, and the isolation of bacteria of Azospirillum genus, capable of fi xing atmospheric nitrogen, from the rhizospheric soil, washed-off roots and histoshere. Materials and meth- ods. The phenotypic features of the selected bacteria were identifi ed according to Bergi key. The molecular the polymerase chain reaction and genetic analysis was used for the identifi cation the bacteria. Results. It has been demonstrated that during the introduction into the root system of spring wheat the strain of A. brasilensе 102 actively colonizes rhizospheric soil, root surface and is capable of penetrating into the inner plant tissues. Conclusions. The soil ascomucete of C. cochliodes 3250 promotes better settling down of Azospirillum cells in spring wheat root zone, especially in plant histosphere which induces the increase in the content of chlorophyll a and b in the leaves and yield of the crop.

Gingival recession and periodontal therapy

2019 ◽  
Vol 31 (1) ◽  
pp. 31-36
Author(s):  
Monya N. Hassan ◽  
Maha A. Aziz
Keyword(s):  
Gingival Recession ◽  
Root Surface ◽  
Periodontal Therapy ◽  
Etiological Factors ◽  
Gingival Margin

Background: Gingival recession is defined as the apical migration of the gingival margin below the cementoenamel junction (CEJ), resulting in exposure of the root surface and it is one of the main esthetic complaints of patients. The management of gingival recession and its sequelae is based on a thorough assessment of the etiological factors and the degree of tissue involvement.

Diseases of the kumara crop

2009 ◽  
Vol 62 ◽  
pp. 402-402
Author(s):  
S.L. Lewthwaite ◽  
P.J. Wright
Keyword(s):  
Fungal Pathogens ◽  
Ipomoea Batatas ◽  
Mechanical Damage ◽  
Soft Rot ◽  
Economic Loss ◽  
Root Surface ◽  
Black Rot ◽  
Rhizopus Stolonifer ◽  
Ceratocystis Fimbriata ◽  
Pink Rot

The predominant diseases of the commercial kumara (Ipomoea batatas) or sweetpotato crop are caused by fungal pathogens The field disease pink rot results from infection by the fungus Sclerotinia sclerotiorum Lesions form on vines but may spread down stems to the roots The widespread nature of this disease in sweetpotato appears peculiar to New Zealand Scurf is a disease caused by Monilochaetes infuscans which occurs in the field but may proliferate amongst stored roots The disease causes a superficial discolouration of the root surface which is mainly cosmetic but can also increase root water loss in storage Infection by Ceratocystis fimbriata produces a disease known as black rot The disease can be transmitted amongst plants at propagation but is particularly rampant amongst roots in storage This disease is readily transmitted and can cause severe economic loss Fusarium oxysporum causes surface rots in stored roots characterised by light to dark brown lesions that tend to be firm dry and superficial The lesions may be circular and centred on wounds caused by insects or mechanical damage at harvest Soft rot caused by Rhizopus stolonifer generally occurs in roots after they are washed and prepared for the market Fungal infection occurs through wounds or bruised tissue producing distinctive tufts of white fungal strands and black spores

Nutrition characteristics in root surface and rhizosphere soils of direct-seeding rice in rice-duck eco-farming system

2010 ◽  
Vol 18 (6) ◽  
pp. 1151-1156 ◽  
Author(s):  
Jian-Kai SHEN ◽  
Huang HUANG ◽  
Zhi-Qiang FU ◽  
Yang-Zhu ZHANG ◽  
Pan LONG ◽  
...  
Keyword(s):  
Farming System ◽  
Root Surface ◽  
Direct Seeding ◽  
Rhizosphere Soils

scholarly journals Nostoc commune UTEX 584 gene expressing indole phosphate hydrolase activity in Escherichia coli.

1989 ◽  
Vol 171 (2) ◽  
pp. 708-713 ◽  
Author(s):  
W Q Xie ◽  
B A Whitton ◽  
J W Simon ◽  
K Jäger ◽  
D Reed ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Hydrolase Activity ◽  
Nostoc Commune ◽  
Gene Expressing

scholarly journals Phytase-Producing Rahnella aquatilis JZ-GX1 Promotes Seed Germination and Growth in Corn (Zea mays L.)

2021 ◽  
Vol 9 (8) ◽  
pp. 1647
Author(s):  
Gui-E Li ◽  
Wei-Liang Kong ◽  
Xiao-Qin Wu ◽  
Shi-Bo Ma
Keyword(s):  
Seed Germination ◽  
Plant Growth ◽  
Biomass Accumulation ◽  
Root Surface ◽  
Phosphorus Concentration ◽  
Maize Seedlings ◽  
Total Phosphorus Concentration ◽  
Rahnella Aquatilis ◽  
Maize Seeds

Phytase plays an important role in crop seed germination and plant growth. In order to fully understand the plant growth-promoting mechanism by Rahnella aquatilis JZ-GX1，the effect of this strain on germination of maize seeds was determined in vitro, and the colonization of maize root by R. aquatilis JZ-GX1 was observed by scanning electron microscope. Different inoculum concentrations and Phytate-related soil properties were applied to investigate the effect of R. aquatilis JZ-GX1 on the growth of maize seedlings. The results showed that R. aquatilis JZ-GX1 could effectively secrete indole acetic acid and had significantly promoted seed germination and root length of maize. A large number of R. aquatilis JZ-GX1 cells colonized on the root surface, root hair and the root interior of maize. When the inoculation concentration was 107 cfu/mL and the insoluble organophosphorus compound phytate existed in the soil, the net photosynthetic rate, chlorophyll content, phytase activity secreted by roots, total phosphorus concentration and biomass accumulation of maize seedlings were the highest. In contrast, no significant effect of inoculation was found when the total P content was low or when inorganic P was sufficient in the soil. R. aquatilis JZ-GX1 promotes the growth of maize directly by secreting IAA and indirectly by secreting phytase. This work provides beneficial information for the development and application of R. aquatilis JZ-GX1 as a microbial fertilizer in the future.

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