Articles
COMPLETE RESISTANCE BY CARNATION CULTIVARS TO FUSARIUM WILT INDUCED BY FUSARIUM OXYSPORUM F.SP. DIANTHI RACE 2
Article number
482_16
Pages
115 – 116
Language
Abstract
In the current study, the response of two carnation cultivars, Arbel and Scarlette, to Fusarium wilt induced by F. o. dianthi, race 2, was compared to wilt observed in carnation cultivars with known degree of resistance (partial resistance) to the pathogen.
Experiments were conducted in an infested field and using artificially inoculated plants grown in a net-house.
In six field experiments conducted from 1989/90 to 1995/96, and including more than 200 different cultivars, Arbel and Scarlette were the only ones that remained symptomless.
The response of the other cultivars varied markedly but even those which are known to be highly resistant, Eveline and Novada, were frequently diseased.
In the net-house tests, Arbel and Scarlette were compared with cultivars that ranged in their response to Fusarium wilt from highly resistant to highly susceptible.
Due to the conducive conditions for Fusarium wilt prevailing in these tests, disease progressed rapidly and by the end of the experiments all cultivars except Arbel and Scarlette were severely diseased (incidence of 81.2–100%); Arbel and Scarlette remained symptomless.
The pathogen did colonize the basal stem parts of all cultivars, including Arbel and Scarlette.
The number of colony forming units (CFU) recovered from the basal stem parts was 105 (CFU)/g stem in the other cultivars; 103 CFU/g in Scarlette; and 50 CFU/g in Arbel.
Results of our study suggest that Arbel and Scarlette exhibit a novel type of resistance (complete resistance) to Fusarium wilt induced by F. o. dianthi, race 2. Planting cultivars such as Arbel and Scarlette, which exhibit complete resistance to Fusarium wilt, may reduce necessity for soil fumigation.
Experiments were conducted in an infested field and using artificially inoculated plants grown in a net-house.
In six field experiments conducted from 1989/90 to 1995/96, and including more than 200 different cultivars, Arbel and Scarlette were the only ones that remained symptomless.
The response of the other cultivars varied markedly but even those which are known to be highly resistant, Eveline and Novada, were frequently diseased.
In the net-house tests, Arbel and Scarlette were compared with cultivars that ranged in their response to Fusarium wilt from highly resistant to highly susceptible.
Due to the conducive conditions for Fusarium wilt prevailing in these tests, disease progressed rapidly and by the end of the experiments all cultivars except Arbel and Scarlette were severely diseased (incidence of 81.2–100%); Arbel and Scarlette remained symptomless.
The pathogen did colonize the basal stem parts of all cultivars, including Arbel and Scarlette.
The number of colony forming units (CFU) recovered from the basal stem parts was 105 (CFU)/g stem in the other cultivars; 103 CFU/g in Scarlette; and 50 CFU/g in Arbel.
Results of our study suggest that Arbel and Scarlette exhibit a novel type of resistance (complete resistance) to Fusarium wilt induced by F. o. dianthi, race 2. Planting cultivars such as Arbel and Scarlette, which exhibit complete resistance to Fusarium wilt, may reduce necessity for soil fumigation.
Authors
Y. Ben-Yephet, M. Reuven, D. Shtienberg
Keywords
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