Abstract
Wilting sugar beet plants (Beta vulgaris L.) were observed in fields in the Larissa area of central Greece during the summers of 1997 and 1998. Diseased plants, showing general yellowing and epinasty, were sporadically distributed in the fields. As symptoms progressed, the outer leaves wilted and became desiccated. Inner leaves showed marginal and interveinal yellowing. These areas later turned brown and became necrotic. Longitudinal sections of the roots of diseased plants displayed browning of vascular tissues. Fungal isolates obtained from discolored vascular tissues on potato dextrose agar (PDA) medium were identified as Verticillium dahliae based on morphological features (1). Cultures grew moderately fast on PDA at 23°C. Mycelia were hyaline and white to cream colored, becoming black with formation of microsclerotia. Conidiophores were hyaline and verticillately branched, with three to four phialides at each node. Conidia borne on phialides were ellipsoidal to short and cylindrical and mainly one-celled (2.5 to 8 × 1.4 to 3.2 µm). Microsclerotia began to form in 6- to 7-day-old cultures and were dark brown to black and varied in shape and size (25 × 50 to 100 µm diameter). Pathogenicity tests were carried out using the root-dip technique. Two-week-old seedlings (cv. Rizor) were inoculated by dipping roots in an aqueous suspension of 10 8 conidia per ml for 1 min. Inocula were obtained from 2-week-old cultures grown on PDA at 21°C by adding sterile water to the petri dish, gently shaking to detach conidia from the conidiophores, and filtering through a doublelayer of sterile cheesecloth. Roots of control plants were dipped in distilled water, and seedlings were transplanted to pots and placed in a growth chamber at 23°C with a 12-h photoperiod. Inoculated plants exhibited wilted leaves with interveinal yellowing ≈30 days after inoculation; symptoms were not observed on control plants. V. dahliae was reisolated from artificially inoculated plants. Measurements of yield parameters in healthy and diseased plants showed that the sugar content of diseased roots was significantly reduced, whereas root weight was not affected. Such results agree with a previous report on the effects of the disease on yield parameters (2). However, the disease is of minor importance in Greece mainly because of the low number of infected plants in the fields. This is the first report of Verticillium wilt of sugar beet in Greece. References: (1) Anonymous. 1971. Verticillium dahliae. No 256: Descriptions of Plant Pathogenic Fungi and Bacteria. Common w. Mycol. Inst., Kew, England. (2) J. O. Gaskill and W. A. Krentzer. Phytopathology 30:769, 1940.
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Claims 9
Claim · model-written summary
Wilting sugar beet occurred in Larissa fields in 1997 and 1998.
- Taxon
- sugar beet
Beta vulgaris subsp. vulgarise0 - Outcome
- Wiltinge0
- Qualifier
- during the summers of 1997 and 1998e0
- Setting
- Larissa area of central Greecee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wilting sugar beet plants (Beta vulgaris L.) were observed in fields in the Larissa area of central Greece during the summers of 1997 and 1998.”
Claim · model-written summary
Diseased sugar beet showed leaf yellowing, epinasty, wilting, desiccation and necrosis, with vascular browning in roots.
- Taxon
- Sugar BeetBeta vulgaris subsp. vulgarist0
- Organ / stage
- leavese0
- Outcome
- general yellowing and epinastye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Diseased plants, showing general yellowing and epinasty, were sporadically distributed in the fields. As symptoms progressed, the outer leaves wilted and became desiccated. Inner leaves showed marginal and interveinal yellowing. These areas later turned brown and became necrotic. Longitudinal sections of the roots of diseased plants displayed browning of vascular tissues.”
t0“Sugar Beet”
Claim · model-written summary
Fungal isolates from diseased sugar beet vascular tissue were identified as Verticillium dahliae.
- Taxon
- Sugar BeetBeta vulgaris subsp. vulgarist0
- Interactor
- Verticillium dahliae
Verticillium dahliaee0pathogen - Outcome
- identified as Verticillium dahliaee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Fungal isolates obtained from discolored vascular tissues on potato dextrose agar (PDA) medium were identified as Verticillium dahliae based on morphological features”
t0“Sugar Beet”
Claim · model-written summary
Inoculated sugar beet seedlings developed wilt and interveinal yellowing after about 30 days, while controls did not.
- Taxon
- Sugar BeetBeta vulgaris subsp. vulgarist0
- Material
- cv. Rizore1
- Treatment
- inoculatede1
- Outcome
- wilted leaves with interveinal yellowinge0
- Value
- ≈30 dayse0
- Comparator
- control plantse0
Not reportedInteractorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculated plants exhibited wilted leaves with interveinal yellowing ≈30 days after inoculation; symptoms were not observed on control plants.”
e1“Two-week-old seedlings (cv. Rizor) were inoculated”
t0“Sugar Beet”
Claim · model-written summary
V. dahliae was reisolated from inoculated sugar beet plants.
- Taxon
- Sugar BeetBeta vulgaris subsp. vulgarist0
- Interactor
- V. dahliaeVerticillium dahliaee0pathogen
- Outcome
- reis olatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“V. dahliae was reisolated from artificially inoculated plants.”
t0“Sugar Beet”
Claim · model-written summary
Diseased sugar beet roots had significantly reduced sugar content.
- Taxon
- Sugar BeetBeta vulgaris subsp. vulgarist0
- Organ / stage
- rootse0
- Outcome
- sugar contente0
- Direction
- reducede0
Not reportedInteractorComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the sugar content of diseased roots was significantly reduced, whereas root weight was not affected.”
t0“Sugar Beet”
Claim · model-written summary
Root weight was not affected in diseased sugar beet.
- Taxon
- Sugar BeetBeta vulgaris subsp. vulgarist0
- Organ / stage
- rootse0
- Outcome
- root weighte0
- Direction
- not affectede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the sugar content of diseased roots was significantly reduced, whereas root weight was not affected.”
t0“Sugar Beet”
Claim · model-written summary
The disease was considered of minor importance in Greece because few plants were infected.
- Taxon
- Sugar BeetBeta vulgaris subsp. vulgarist0
- Outcome
- low number of infected plantse0
- Setting
- Greecee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the disease is of minor importance in Greece mainly because of the low number of infected plants in the fields.”
t0“Sugar Beet”
Claim · model-written summary
This was reported as the first Verticillium wilt of sugar beet in Greece.
- Taxon
- sugar beetBeta vulgaris subsp. vulgarise0
- Interactor
- VerticilliumVerticilliume0pathogen
- Outcome
- first report of Verticillium wilte0
- Setting
- Greecee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This is the first report of Verticillium wilt of sugar beet in Greece.”
The same questions in other papers
inoculation · disease · Beta vulgaris (beet)Positive and negative results
16 papers in the same direction as this paper · 7 in the opposite direction
- positive
- positive
- positive
20 papers more in this group
See all 24 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.