Abstract
AIMS: To investigate the effects of mannosylerythritol lipids (MELs) on the hydrophobicity of solid surfaces, their suppressive activity against the early infection behaviours of several phytopathogenic fungal conidia, and their suppressive activity against disease occurrences on fungal host plant leaves. METHODS AND RESULTS: The changes in the hydrophobicity of plastic film surfaces resulting from treatments with MEL solutions (MEL-A, MEL-B, MEL-C and isoMEL-B) and synthetic surfactant solutions were evaluated based on the changes in contact angles of water droplets placed on the surfaces. The droplet angles on surfaces treated with MELs were verified to decrease within 100 s after placement, with contact angles similar to those observed on Tween 20-treated surfaces, indicating decreases in surface hydrophobicity after MEL treatments. Next, conidial germination, germ tube elongation and the formation of appressorium of Blumeria graminis f. sp. tritici, Colletotrichum dematium, Glomerella cingulata and Magnaporthe grisea were evaluated on plastic surfaces that were pretreated with surfactant solutions. On the surfaces of MEL-treated plastic film, inhibition of conidial germination, germ tube elongation, and suppression of appressoria formation tended to be observed, although the level of effect was dependent on the combination of fungal species and type of MEL. Inoculation tests revealed that the powdery mildew symptom caused by B. graminis f. sp. tritici was significantly suppressed on wheat leaf segments treated with MELs. CONCLUSIONS: MELs exhibited superior abilities in reducing the hydrophobicity of solid surfaces, and have the potential to suppress powdery mildew in wheat plants, presumably due to the inhibition of conidial germination. SIGNIFICANCE AND IMPACT OF THE STUDY: This study provides significant evidence of the potential for MELs to be used as novel agricultural chemical pesticides.
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Claims 3
Claim · model-written summary
MELs decreased plastic surface hydrophobicity.
- Treatment
- MEL treatmentse0
- Outcome
- surface hydrophobicitye0
- Direction
- decreasese0
- Value
- within 100 se0
- Comparator
- Tween 20-treated surfacese0
Not reportedTaxon
Verbatim
e0“The droplet angles on surfaces treated with MELs were verified to decrease within 100 s after placement, with contact angles similar to those observed on Tween 20-treated surfaces, indicating decreases in surface hydrophobicity after MEL treatments.”
Claim · model-written summary
MEL-treated surfaces tended to inhibit conidial germination and germ tube elongation and suppress appressoria formation, depending on species and MEL type.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- MEL-treated plastic filme0
- Outcome
- conidial germination, germ tube elongation, and suppression of appressoria formatione0
- Direction
- inhibitione0
- Qualifier
- dependent on the combination of fungal species and type of MELe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On the surfaces of MEL-treated plastic film, inhibition of conidial germination, germ tube elongation, and suppression of appressoria formation tended to be observed, although the level of effect was dependent on the combination of fungal species and type of MEL.”
e1“Inoculation tests revealed that the powdery mildew symptom caused by B. graminis f. sp. tritici was significantly suppressed on wheat leaf segments treated with MELs.”
Claim · model-written summary
MEL treatment significantly suppressed powdery mildew symptoms on wheat leaf segments.
- Taxon
- wheatTriticum aestivume0
- Treatment
- MELse0
- Interactor
- B. graminis f. sp. tritici
Blumeria graminis f. sp. triticie0pathogen - Outcome
- powdery mildew symptome0
- Direction
- suppressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Inoculation tests revealed that the powdery mildew symptom caused by B. graminis f. sp. tritici was significantly suppressed on wheat leaf segments treated with MELs.”
The same questions in other papers
mulching · disease · Triticum aestivum (wheat)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
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.