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Vegetative compatibility and heterokaryon stability in Fusarium oxysporum f.sp. radicis-lycopersici from Italy
Year:
2001
Source of publication :
Plant Pathology
Authors :
קטן, תלמה
;
.
Volume :
50
Co-Authors:

Di Primo, P., Dipartimento di Agrochimica e Agrobiologia, Università degli Studi di Reggio Calabria, 89061 Gallina (RC), Italy, Laboratory for Pest Management Research, Institute of Agricultural Engineering, Volcani Center, Bet Dagan 50250, Israel
Cartia, G., Dipartimento di Agrochimica e Agrobiologia, Università degli Studi di Reggio Calabria, 89061 Gallina (RC), Italy
Katan, T., Department of Plant Pathology, ARO, Volcani Center, Bet Dagan 50250, Israel

Facilitators :
From page:
371
To page:
382
(
Total pages:
12
)
Abstract:
Fusarium crown and root rot, caused by Fusarium exysporum f.sp. radicis-lycopersici (Forl), is one of the most destructive soilborne diseases of tomato in Italy. Chlorate-resistant, nitrate-nonutilizing (nit) mutants were used to determine vegetative compatibility among 191 isolates of Forl collected in five geographic regions (Calabria, Emilia-Romagna, Liguria, Sardinia, Sicily) in Italy. The isolates were assigned to five vegetative compatibility groups (VCGs): 65 isolates to VCG 0090; 99 to VCG 0091; 23 to VCG 0092; two to VCG 0093; and two to VCG 0096. The population structure of Forl in Italy is similar to that reported for Israel, and differs from that found in North Atlantic European countries, where VCG 0094 is predominant. The stability of prototrophic heterokaryons originating from hyphal anastomosis between compatible complementary nit mutants was assessed through conidial analysis and mycelial mass transfer. Most monoconidial cultures (84%) recovered from 117 prototrophic heterokaryons were nit mutants, indicating that heterokaryons generally do not proliferate well through conidiation; most of the 177 prototrophic heterokaryons examined were unstable, and only 9% sustained prototrophic growth through the tenth mycelial transfer upon subculturing. The prototrophic growth is proposed to be maintained through restoration of the heterokaryotic state by continual anastomosis between adjacent homokaryotic hyphae. Since heterokaryosis is a prerequisite for parasexual recombination, we speculate that this mechanism is unlikely to play a major role in generating the VCG diversity found among Forl or other strains of F. oxysperum.
Note:
Related Files :
Cell Proliferation
Fungal infection
Fusarium crown rot
Israel
Italy
Plant Disease
עוד תגיות
תוכן קשור
More details
DOI :
10.1046/j.1365-3059.2001.00561.x
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
26758
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:25
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Scientific Publication
Vegetative compatibility and heterokaryon stability in Fusarium oxysporum f.sp. radicis-lycopersici from Italy
50

Di Primo, P., Dipartimento di Agrochimica e Agrobiologia, Università degli Studi di Reggio Calabria, 89061 Gallina (RC), Italy, Laboratory for Pest Management Research, Institute of Agricultural Engineering, Volcani Center, Bet Dagan 50250, Israel
Cartia, G., Dipartimento di Agrochimica e Agrobiologia, Università degli Studi di Reggio Calabria, 89061 Gallina (RC), Italy
Katan, T., Department of Plant Pathology, ARO, Volcani Center, Bet Dagan 50250, Israel

Vegetative compatibility and heterokaryon stability in Fusarium oxysporum f.sp. radicis-lycopersici from Italy
Fusarium crown and root rot, caused by Fusarium exysporum f.sp. radicis-lycopersici (Forl), is one of the most destructive soilborne diseases of tomato in Italy. Chlorate-resistant, nitrate-nonutilizing (nit) mutants were used to determine vegetative compatibility among 191 isolates of Forl collected in five geographic regions (Calabria, Emilia-Romagna, Liguria, Sardinia, Sicily) in Italy. The isolates were assigned to five vegetative compatibility groups (VCGs): 65 isolates to VCG 0090; 99 to VCG 0091; 23 to VCG 0092; two to VCG 0093; and two to VCG 0096. The population structure of Forl in Italy is similar to that reported for Israel, and differs from that found in North Atlantic European countries, where VCG 0094 is predominant. The stability of prototrophic heterokaryons originating from hyphal anastomosis between compatible complementary nit mutants was assessed through conidial analysis and mycelial mass transfer. Most monoconidial cultures (84%) recovered from 117 prototrophic heterokaryons were nit mutants, indicating that heterokaryons generally do not proliferate well through conidiation; most of the 177 prototrophic heterokaryons examined were unstable, and only 9% sustained prototrophic growth through the tenth mycelial transfer upon subculturing. The prototrophic growth is proposed to be maintained through restoration of the heterokaryotic state by continual anastomosis between adjacent homokaryotic hyphae. Since heterokaryosis is a prerequisite for parasexual recombination, we speculate that this mechanism is unlikely to play a major role in generating the VCG diversity found among Forl or other strains of F. oxysperum.
Scientific Publication
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