INFLUENCE OF AMINO ACIDS AND SUBSTANCES FROM FLAX ROOTS ON THE SOIL-BORNE PLANT PATHOGEN FUSARIUM OXYSPORUM F. LINI

1977 ◽  
Vol 57 (2) ◽  
pp. 407-411 ◽  
Author(s):  
E. A. PETERSON ◽  
M. I. TIMONIN
Keyword(s):  
Amino Acids ◽  
Fusarium Oxysporum ◽  
Plant Pathogen ◽  
Chlamydospore Formation ◽  
Soil Fungistasis ◽  
Flax Cultivar

Repeated subculturing of different isolates of Fusarium oxysporum f. lini on Czapek’s agar supplemented with specific amino acids caused extensive distortion of hyphal cells and conidia as well as a notable inhibition of chlamydospore formation. Certain amino acids also decreased the virulence of most of the isolates to a wilt-susceptible flax cultivar (Novelty) and affected the extent of counteraction of soil fungistasis brought about by substances from flax roots.

scholarly journals Developmentally Regulated Oscillations in the Expression of UV Repair Genes in a Soilborne Plant Pathogen Dictate UV Repair Efficiency and Survival

mBio ◽  
2019 ◽  
Vol 10 (6) ◽  
Author(s):  
Shira Milo-Cochavi ◽  
Sheera Adar ◽  
Shay Covo
Keyword(s):  
Gene Expression ◽  
Fusarium Oxysporum ◽  
Plant Pathogen ◽  
Uv Light ◽  
Sun Exposure ◽  
The Sun ◽  
Repair Gene ◽  
Repair Capacity ◽  
Content Type ◽  
Repair Genes

ABSTRACT The ability to withstand UV damage shapes the ecology of microbes. While mechanisms of UV tolerance were extensively investigated in microorganisms regularly exposed to the sun, far less is known about UV repair of soilborne microorganisms. Fusarium oxysporum is a soilborne fungal plant pathogen that is resistant to UV light. We hypothesized that its UV repair capacity is induced to deal with irregular sun exposure. Unlike the SOS paradigm, our analysis revealed only sporadic increases and even decreases in UV repair gene expression following UVC irradiation or exposure to visible light. Strikingly, a major factor determining the expression of UV repair genes was the developmental status of the fungus. At the early stages of germination, the expression of photolyase increased while the expression of UV endonuclease decreased, and then the trend was reversed. These gene expression oscillations were dependent on cell cycle progression. Consequently, the contribution of photoreactivation to UV repair and survival was stronger at the beginning of germination than later when a filament was established. F. oxysporum germinates following cues from the host. Early on in germination, it is most vulnerable to UV; when the filament is established, the pathogen is protected from the sun because it is already within the host tissue. IMPORTANCE Fusarium oxysporum infects plants through the roots and therefore is not exposed to the sun regularly. However, the ability to survive sun exposure expands the distribution of the population. UV from the sun is toxic and mutagenic, and to survive sun exposure, fungi encode several DNA repair mechanisms. We found that Fusarium oxysporum has a gene expression program that activates photolyase at the first hours of germination when the pathogen is not established in the plant tissue. Later on, the expression of photolyase decreases, and the expression of a light-independent UV repair mechanism increases. We suggest a novel point of view to a very fundamental question of how soilborne microorganisms defend themselves against sudden UV exposure.

Amino Acids and Fusaric Acid Production in Tissues of Cajanus cajan infected with Fusarium oxysporum f. udum

1974 ◽  
Vol 81 (4) ◽  
pp. 339-345 ◽  
Author(s):  
M. Prasad ◽  
S. K. Chaudhary
Keyword(s):  
Amino Acids ◽  
Fusarium Oxysporum ◽  
Cajanus Cajan ◽  
Acid Production ◽  
Fusaric Acid

scholarly journals GC-TOF/MS-based metabolomics analysis to investigate the changes driven by N-Acetylcysteine in the plant-pathogen Xanthomonas citri subsp. citri

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Simone Cristina Picchi ◽  
Mariana de Souza e Silva ◽  
Luiz Leonardo Saldanha ◽  
Henrique Ferreira ◽  
Marco Aurélio Takita ◽  
...  
Keyword(s):  
Amino Acids ◽  
Cell Proliferation ◽  
Plant Pathogen ◽  
Model Organism ◽  
Citrus Canker ◽  
Bacterial Cells ◽  
Xanthomonas Citri ◽  
Canker Disease ◽  
Potential Use

AbstractN-Acetylcysteine (NAC) is an antioxidant, anti-adhesive, and antimicrobial compound. Even though there is much information regarding the role of NAC as an antioxidant and anti-adhesive agent, little is known about its antimicrobial activity. In order to assess its mode of action in bacterial cells, we investigated the metabolic responses triggered by NAC at neutral pH. As a model organism, we chose the Gram-negative plant pathogen Xanthomonas citri subsp. citri (X. citri), the causal agent of citrus canker disease, due to the potential use of NAC as a sustainable molecule against phytopathogens dissemination in citrus cultivated areas. In presence of NAC, cell proliferation was affected after 4 h, but damages to the cell membrane were observed only after 24 h. Targeted metabolite profiling analysis using GC–MS/TOF unravelled that NAC seems to be metabolized by the cells affecting cysteine metabolism. Intriguingly, glutamine, a marker for nitrogen status, was not detected among the cells treated with NAC. The absence of glutamine was followed by a decrease in the levels of the majority of the proteinogenic amino acids, suggesting that the reduced availability of amino acids affect protein synthesis and consequently cell proliferation.

Alterations in the Composition of Free and Combined Amino Acids in Susceptible and Resistant Tomato Cultivars infected with Fusarium oxysporum f. lycopersici

1974 ◽  
Vol 79 (3) ◽  
pp. 258-280 ◽  
Author(s):  
V. Raggi ◽  
A. Zazzerini ◽  
B. Barberini ◽  
F. Ferranti ◽  
R. Draoli
Keyword(s):  
Amino Acids ◽  
Fusarium Oxysporum ◽  
Tomato Cultivars

scholarly journals Role of rock phosphate in alleviation of heavy metals stress on Fusarium oxysporum

2008 ◽  
Vol 53 (No. 1) ◽  
pp. 1-6 ◽  
Author(s):  
H.A.H. Hasan
Keyword(s):  
Heavy Metals ◽  
Amino Acids ◽  
Glycine Max ◽  
Fusarium Oxysporum ◽  
Endophytic Fungus ◽  
Rock Phosphate ◽  
Significant Growth ◽  
Adsorption Affinity

An endophytic fungus of soyabean (Glycine max) roots, Fusarium oxysporum, was used to study its activity under heavy metals (Cd<sup>2+</sup>, Mn<sup>2+</sup> and Zn<sup>2+</sup>) stress and the role of rock phosphate (RP) in alleviation of the stress. F.&nbsp;oxysporum growth, amino acids and protein were increased by increasing RP concentration (1&ndash;6 g/l) after 8 and 14 days. Heavy metals (HM) have a stressing effect on F. oxysporum &ndash; a significant decrease of amino acids, protein and accumulation of sugar at 1mM/l follows a descending order of Cd<sup>2+</sup> &gt; Mn<sup>2+</sup> &gt; Zn<sup>2+</sup>. RP is altering the stressing effects of metal on F. oxysporum by a significant growth improvement at 3 and 6 g/l RP, increase of amino acids, protein and decrease of sugar. The solubilization of RP increased under HM application, which may be attributed to an increase of the adsorption of HM by increasing RP concentration. RP has the highest adsorption affinity for Cd<sup>2+</sup> (81%) followed by Zn<sup>2+</sup> (71%) and Mn<sup>2+</sup>(55%).

Agricultural By-products as Substrates for Growth, Conidiation and Chlamydospore Formation by a Potential Mycoherbicide, Fusarium oxysporum Strain EN4

1996 ◽  
Vol 6 (2) ◽  
pp. 263-276 ◽  
Author(s):  
K. P. HEBBAR ◽  
J. A. LEWIS ◽  
S. M. POCH ◽  
R. D. LUMSDEN
Keyword(s):  
Fusarium Oxysporum ◽  
Chlamydospore Formation ◽  
By Products

Improved chlamydospore formation in Tricholoma bakamatsutake with addition of amino acids in vitro

Mycoscience ◽  
2019 ◽  
Vol 60 (6) ◽  
pp. 319-322 ◽  
Author(s):  
Takashi Yamanaka ◽  
Miki Konno ◽  
Masataka Kawai ◽  
Yuko Ota ◽  
Noritaka Nakamura ◽  
...  
Keyword(s):  
Amino Acids ◽  
Tricholoma Bakamatsutake ◽  
Chlamydospore Formation
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