Abstract
ABSTRACT Under conditions of sulfur (S)-deficient soil, applied S fertilization had a significant repressive effect on fungal infections such as that of oilseed rape and grapes with light leaf spot (Pyrenopeziza brassicae) and powdery mildew (Uncinula necator), respectively. For potatoes (Solanum tuberosum L.) it has been shown in earlier literature that elemental sulfur fertilization increased yield of potato tubers and improved tuber quality and resistance against Streptomyces scabies; the bactericidal effect was attributed to a reduced soil pH. So far, however, no information is available about the influence of S supply on bacterial and fungal diseases in potatoes. It was the aim of the present investigation to quantify the influence of S form and dose on infections of potato tubers with Rhizoctonia solani and Streptomyces scabies as a contribution to plant nutrition strategies for healthier plants. Field experiments with potatoes were conducted in 2001 and 2002 in Poland in a split-plot design with different sulfur forms (elemental S and K2SO4) and rates (0, 25, and 50 kg ha− 1 S). The application of sulfur significantly increased tuber yield in both years of experimentation. Generally, with increasing sulfur dose a significant decrease of the infection rate with Rhizoctonia solani was found for elemental S as well as for K2SO4 applications. Infection rate and severity of the disease was improved only by elemental S application due to a reduction in soil pH in the case of Streptomyces scabies. Thus it can be concluded that the health-promoting effect of sulfur fertilization was related mainly to the S status of the plant in case of infections with Rhizoctonia solani, while for Streptomyces scabies no mechanisms of S-induced resistance were found. The identification of differences in the S metabolism of Rhizoctonia solani and Streptomyces scabies may therefore elucidate S-induced resistance mechanisms in plants. Keywords: sulfateelemental sulfurfertilizationsulfur metabolitessulfur-induced resistance (SIR) Notes 1small sclerotia; 2small and big sclerotia
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Claims 8
Claim · model-written summary
Sulfur application significantly increased potato tuber yield in both years.
- Taxon
- Potato
Solanum tuberosumt0 - Treatment
- application of sulfure0
- Outcome
- tuber yielde0
- Direction
- increasede0
- Qualifier
- both years of experimentatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of sulfur significantly increased tuber yield in both years of experimentation”
t0“Potato Tubers”
Claim · model-written summary
Increasing elemental sulfur dose significantly reduced Rhizoctonia solani infection rate.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- elemental Se0
- Interactor
- Rhizoctonia solani
Rhizoctonia solanie0pathogen - Outcome
- infection rate with Rhizoctonia solanie0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with increasing sulfur dose a significant decrease of the infection rate with Rhizoctonia solani was found for elemental S”
t0“Potato Tubers”
Claim · model-written summary
Increasing K2SO4 dose significantly reduced Rhizoctonia solani infection rate.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- K2SO4 applicationse0
- Interactor
- Rhizoctonia solaniRhizoctonia solanie0pathogen
- Outcome
- infection rate with Rhizoctonia solanie0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with increasing sulfur dose a significant decrease of the infection rate with Rhizoctonia solani was found for elemental S as well as for K2SO4 applications”
t0“Potato Tubers”
Claim · model-written summary
Elemental sulfur improved Streptomyces scabies infection rate.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- elemental S applicatione0
- Interactor
- Streptomyces scabiesStreptomyces scabieie0pathogen
- Outcome
- Infection ratee0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Infection rate and severity of the disease was improved only by elemental S application due to a reduction in soil pH in the case of Streptomyces scabies”
t0“Potato Tubers”
Claim · model-written summary
Elemental sulfur improved Streptomyces scabies disease severity.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- elemental S applicatione0
- Interactor
- Streptomyces scabiesStreptomyces scabieie0pathogen
- Outcome
- severity of the diseasee0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Infection rate and severity of the disease was improved only by elemental S application due to a reduction in soil pH in the case of Streptomyces scabies”
t0“Potato Tubers”
Claim · model-written summary
The authors attributed the Streptomyces scabies response to reduced soil pH.
- Taxon
- PotatoSolanum tuberosumt0
- Interactor
- Streptomyces scabiesStreptomyces scabieie0pathogen
- Outcome
- reduction in soil pHe0
- Qualifier
- soil pHe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“due to a reduction in soil pH in the case of Streptomyces scabies”
t0“Potato Tubers”
Claim · model-written summary
The authors associated the Rhizoctonia solani health effect with plant sulfur status.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- sulfur fertilizatione0
- Interactor
- Rhizoctonia solaniRhizoctonia solanie0pathogen
- Outcome
- health-promoting effecte0
- Qualifier
- S status of the plante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the health-promoting effect of sulfur fertilization was related mainly to the S status of the plant in case of infections with Rhizoctonia solani”
t0“Potato Tubers”
Claim · model-written summary
The authors found no sulfur-induced resistance mechanism for Streptomyces scabies.
- Taxon
- PotatoSolanum tuberosumt0
- Interactor
- Streptomyces scabiesStreptomyces scabieie0pathogen
- Outcome
- no mechanisms of S-induced resistance were founde0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“for Streptomyces scabies no mechanisms of S-induced resistance were found”
t0“Potato Tubers”
The same questions in other papers
sulfur atom · yield · Solanum tuberosum (potato)Positive and negative results
8 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- positive
6 papers more in this group
See all 10 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.