Observations on chlamydospore production by Fusarium in a two-salt solution

1970 ◽  
Vol 16 (1) ◽  
pp. 29-32 ◽  
Author(s):  
A. A. Qureshi ◽  
O. T. Page
Keyword(s):  
Magnesium Sulfate ◽  
Fusarium Oxysporum ◽  
Salt Solution ◽  
Potassium Phosphate ◽  
Magnesium Carbonate ◽  
Monobasic Potassium Phosphate ◽  
Chlamydospore Formation

An isolate of Fusarium oxysporum grown in a solution of monobasic potassium phosphate and magnesium sulfate rarely produced chlamydospores. However, when the salt solution was amended with 0.125 mg to 2.0 mg per liter of either glucose or magnesium carbonate, there was an abundant production of chlamydospores within 3 to 4 days after inoculation. While an organic or inorganic source of carbon stimulated chlamydospore formation, repression of chlamydospore production occurred with glucose and magnesium carbonate levels above 2.0 mg per liter. The addition of either an ammonium or nitrate source of nitrogen to the salt solution did not produce additional chlamydospores.

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

scholarly journals FoSTUA, Encoding a Basic Helix-Loop-Helix Protein, Differentially Regulates Development of Three Kinds of Asexual Spores, Macroconidia, Microconidia, and Chlamydospores, in the Fungal Plant Pathogen Fusarium oxysporum

2004 ◽  
Vol 3 (6) ◽  
pp. 1412-1422 ◽  
Author(s):  
Toshiaki Ohara ◽  
Takashi Tsuge
Keyword(s):  
Fusarium Oxysporum ◽  
Fluorescent Protein ◽  
Negative Regulator ◽  
Vascular Wilt ◽  
Wild Type ◽  
Low Frequencies ◽  
Basic Helix Loop Helix ◽  
Helix Loop Helix ◽  
Chlamydospore Formation ◽  
Green Fluorescent

ABSTRACT The soil-borne fungus Fusarium oxysporum causes vascular wilt of a wide variety of plant species. F. oxysporum produces three kinds of asexual spores, macroconidia, microconidia, and chlamydospores. Falcate macroconidia are formed generally from terminal phialides on conidiophores and rarely from intercalary phialides on hyphae. Ellipsoidal microconidia are formed from intercalary phialides on hyphae. Globose chlamydospores with thick walls are developed by the modification of hyphal and conidial cells. Here we describe FoSTUA of F. oxysporum, which differentially regulates the development of macroconidia, microconidia, and chlamydospores. FoSTUA encodes a basic helix-loop-helix protein with similarity to Aspergillus nidulans StuA, which has been identified as a transcriptional regulator controlling conidiation. Nuclear localization of FoStuA was verified by using strains expressing FoStuA-green fluorescent protein fusions. The FoSTUA-targeted mutants exhibited normal microconidium formation in cultures. However, the mutants lacked conidiophores and produced macroconidia at low frequencies only from intercalary phialides. Thus, FoSTUA appears to be necessary to induce conidiophore differentiation. In contrast, chlamydospore formation was dramatically promoted in the mutants. These data demonstrate that FoStuA is a positive regulator and a negative regulator for the development of macroconidia and chlamydospores, respectively, and is dispensable for microconidium formation in cultures. The disease-causing ability of F. oxysporum was not affected by mutations in FoSTUA. However, the mutants produced markedly fewer macroconidia and microconidia in infected plants than the wild type. These results suggest that FoSTUA also has an important role for microconidium formation specifically in infected plants.

scholarly journals Chlamydospore formation in hyphae of Fusarium oxysporum f. sp. raphani.

1983 ◽  
Vol 29 (3) ◽  
pp. 187-193
Author(s):  
HIDEYUKI NAGAO ◽  
TSUTOMU HATTORI
Keyword(s):  
Fusarium Oxysporum ◽  
Chlamydospore Formation

scholarly journals Chlamydospore Formation of Fusarium in a Mineral Salt Solution

1971 ◽  
Vol 37 (5) ◽  
pp. 326-332
Author(s):  
Hiroshi OKAZAKI
Keyword(s):  
Salt Solution ◽  
Mineral Salt ◽  
Chlamydospore Formation

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.

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