Abstract
A new spiral nematode species, Scutellonema curcumae sp. n., was identified from the rhizosphere of turmeric (Curcuma longa L.) in the Western Highlands of Vietnam. Integrative taxonomical analysis, combining detailed morphology and molecular characterization (ITS, 28S D2–D3 rDNA, and COI mtDNA), confirmed its distinctiveness. Scutellonema curcumae sp. n. is characterized by a unique combination of a spiral body, a hemispherical lip region with four annuli, a robust stylet, and a rounded tail with a prominent scutellum, forming a highly divergent lineage within the genus. Beyond its description, this study reveals a significant inverse correlation between nematode population density and the phytochemical quality of the host. High infestation levels were associated with a marked decline in total curcuminoid content. Notably, lower nematode density favored a specific shift in the curcuminoid profile, with bisdemethoxycurcumin levels increasing by up to 250%. These phytochemical alterations directly influenced the therapeutic potential of the rhizomes: lower infestation levels resulted in significantly enhanced antioxidant capacity (lower SC50 values) and cytotoxic activity (lower IC50 against HepG2 and A549 cell lines). This work represents the first report of a Scutellonema species associated with turmeric in Vietnam and underscores its detrimental impact on the medicinal and nutraceutical value of the crop. Our findings suggest that effective nematode management is crucial not only for yield protection but as a strategic intervention in precision agriculture to optimize the secondary metabolite profiles of medicinal plants.
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Claims 7
Claim · model-written summary
A new spiral nematode species, Scutellonema curcumae sp. n., was identified from the rhizosphere of turmeric in the Western Highlands of Vietnam.
- Taxon
- turmeric
_W_IMG_2440.jpg?width=60)
Curcuma longae0 - Interactor
- Scutellonema curcumae sp. n.Scutellonema curcumaee0pest
- Outcome
- new spiral nematode speciese0
- Setting
- Western Highlands of Vietname0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_W_IMG_2440.jpg?width=500)
Verbatim
e0“A new spiral nematode species, Scutellonema curcumae sp. n., was identified from the rhizosphere of turmeric (Curcuma longa L.) in the Western Highlands of Vietnam”
Claim · model-written summary
This is the first report of a Scutellonema species associated with turmeric in Vietnam.
- Taxon
- turmericCurcuma longae0
- Interactor
- ScutellonemaScutellonemae0pest
- Outcome
- first report of a Scutellonema speciese0
- Setting
- Vietname0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This work represents the first report of a Scutellonema species associated with turmeric in Vietnam”
Claim · model-written summary
Nematode population density was significantly inversely correlated with the phytochemical quality of turmeric.
Verbatim
e0“a significant inverse correlation between nematode population density and the phytochemical quality of the host”
Claim · model-written summary
High nematode infestation was associated with a marked decline in total curcuminoid content.
Not reportedTaxon
Verbatim
e0“High infestation levels were associated with a marked decline in total curcuminoid content”
Claim · model-written summary
Lower nematode density was associated with bisdemethoxycurcumin levels increasing by up to 250%.
- Treatment
- lower nematode densitye0
- Outcome
- bisdemethoxycurcumin levelse0
- Direction
- increasinge0
- Value
- up to 250%e0
Not reportedTaxon
Verbatim
e0“lower nematode density favored a specific shift in the curcuminoid profile, with bisdemethoxycurcumin levels increasing by up to 250%”
Claim · model-written summary
Lower infestation levels resulted in significantly enhanced antioxidant capacity and cytotoxic activity of the rhizomes.
- Treatment
- lower infestation levelse0
- Outcome
- antioxidant capacity (lower SC50 values) and cytotoxic activitye0
- Direction
- enhancede0
Not reportedTaxon
Verbatim
e0“lower infestation levels resulted in significantly enhanced antioxidant capacity (lower SC50 values) and cytotoxic activity (lower IC50 against HepG2 and A549 cell lines)”
Claim · model-written summary
Effective nematode management is suggested to be crucial for yield protection and to optimize secondary metabolite profiles of medicinal plants.
Verbatim
e0“effective nematode management is crucial not only for yield protection but as a strategic intervention in precision agriculture to optimize the secondary metabolite profiles of medicinal plants”