Abstract
Abstract The effects of potassium nitrate (KNO 3 ) application on Phytophthora stem rot disease reduction of Glycine max (L.) Merr. cvs. Chusei‐Hikarikuro and Sachiyutaka, and mycelium growth and zoospore release of a Phytophthora sojae isolate were investigated under laboratory conditions. The application of 4–30 m m KNO 3 prior to inoculation greatly reduced incidence of disease in the two soybean cultivars. Although a concentration of 20–30 m m KNO 3 led to a slight decrease in the growth rate of the PJ‐H30 isolate on PDA medium, no significant relationship was observed between inhibition of the growth rate and disease reduction on application of 0.4–10 m m KNO 3 . Disease suppression recorded in laboratory experiments using pathogen mycelium was due to the response of plant tissues rather than a direct inhibition of pathogen hyphal growth by the application of KNO 3 . The extent of disease reduction was related to increased potassium concentration in plants of the two cultivars (except for some cases involving cv. Sachiyutaka), suggesting that differences existed between the two cultivars in terms of the effect of KNO 3 application on disease suppression. Scanning electron microscopic observation with fresh samples indicated marked accumulation of potassium at the penetration‐stopping sites of P. sojae in the cortex layer of soybean plants treated with 30 m m KNO 3 , compared with the non‐treated control plants. The presence of 0.4–30 m m KNO 3 decreased the release of zoospores. These results suggest the possibility of applying a solution containing 20–30 m m of KNO 3 to decrease the incidence of disease in agricultural fields by the response of plant tissues to KNO 3 .
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Claims 8
Claim · model-written summary
Potassium nitrate before inoculation greatly reduced disease incidence in both cultivars.
- Taxon
- Glycine max (L.) Merr.
Glycine maxe1 - Treatment
- 4–30 m m KNO 3 prior to inoculatione0
- Interactor
- Phytophthora sojaePhytophthora sojaee2pathogen
- Outcome
- incidence of diseasee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The application of 4–30 m m KNO 3 prior to inoculation greatly reduced incidence of disease in the two soybean cultivars”
e1“Glycine max (L.) Merr. cvs. Chusei‐Hikarikuro and Sachiyutaka”
e2“Phytophthora sojae isolate”
Claim · model-written summary
At 20–30 m m, potassium nitrate slightly decreased pathogen isolate growth on PDA.
- Taxon
- Glycine max (L.) Merr.Glycine maxe1
- Treatment
- 20–30 m m KNO 3e0
- Interactor
- Phytophthora sojaePhytophthora sojaee2pathogen
- Outcome
- growth rate of the PJ‐H30 isolatee0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“20–30 m m KNO 3 led to a slight decrease in the growth rate of the PJ‐H30 isolate on PDA medium”
e1“Glycine max (L.) Merr.”
e2“Phytophthora sojae isolate”
Claim · model-written summary
Growth inhibition and disease reduction were not significantly related at 0.4–10 m m KNO 3.
- Taxon
- Glycine max (L.) Merr.Glycine maxe1
- Treatment
- 0.4–10 m m KNO 3e0
- Interactor
- Phytophthora sojaePhytophthora sojaee2pathogen
- Outcome
- relationship was observed between inhibition of the growth rate and disease reductione0
- Direction
- no significante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant relationship was observed between inhibition of the growth rate and disease reduction on application of 0.4–10 m m KNO 3”
e1“Glycine max (L.) Merr.”
e2“Phytophthora sojae isolate”
Claim · model-written summary
Disease suppression with pathogen mycelium was attributed to plant tissue response.
- Taxon
- Glycine max (L.) Merr.Glycine maxe1
- Treatment
- KNO 3e0
- Interactor
- Phytophthora sojaePhytophthora sojaee2pathogen
- Outcome
- Disease suppressione0
- Qualifier
- response of plant tissuese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Disease suppression recorded in laboratory experiments using pathogen mycelium was due to the response of plant tissues rather than a direct inhibition of pathogen hyphal growth by the application of KNO 3”
e1“Glycine max (L.) Merr.”
e2“Phytophthora sojae isolate”
Claim · model-written summary
Disease reduction was related to increased plant potassium concentration, with exceptions in Sachiyutaka.
- Taxon
- Glycine max (L.) Merr.Glycine maxe1
- Interactor
- Phytophthora sojaePhytophthora sojaee2pathogen
- Compound
- potassiume0
- Outcome
- disease reductione0
- Direction
- reductione0
- Qualifier
- except for some cases involving cv. Sachiyutakae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The extent of disease reduction was related to increased potassium concentration in plants of the two cultivars (except for some cases involving cv. Sachiyutaka)”
e1“Glycine max (L.) Merr.”
e2“Phytophthora sojae isolate”
Claim · model-written summary
Potassium accumulated at pathogen penetration-stopping sites in treated soybean cortex compared with controls.
- Taxon
- soybeanGlycine maxe0
- Organ / stage
- cortex layere0
- Treatment
- 30 m m KNO 3e0
- Interactor
- P. sojaePhytophthora sojaee0pathogen
- Outcome
- accumulation of potassiume0
- Direction
- accumulatione0
- Comparator
- non‐treated control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“marked accumulation of potassium at the penetration‐stopping sites of P. sojae in the cortex layer of soybean plants treated with 30 m m KNO 3 , compared with the non‐treated control plants”
Claim · model-written summary
Potassium nitrate decreased pathogen zoospore release.
- Taxon
- Glycine max (L.) Merr.Glycine maxe1
- Treatment
- 0.4–30 m m KNO 3e0
- Interactor
- Phytophthora sojaePhytophthora sojaee2pathogen
- Outcome
- release of zoosporese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The presence of 0.4–30 m m KNO 3 decreased the release of zoospores”
e1“Glycine max (L.) Merr.”
e2“Phytophthora sojae isolate”
Claim · model-written summary
The authors suggest 20–30 m m potassium nitrate solution to reduce field disease incidence.
- Taxon
- Glycine max (L.) Merr.Glycine maxe1
- Outcome
- applying a solution containing 20–30 m m of KNO 3 to decrease the incidence of diseasee0
- Setting
- agricultural fieldse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“applying a solution containing 20–30 m m of KNO 3 to decrease the incidence of disease in agricultural fields”
e1“Glycine max (L.) Merr.”
The same questions in other papers
inoculation · Phytophthora sojae · Glycine max (soybean)Positive and negative results
1 paper in the same direction as this paper · 5 in the opposite direction
- negative
- negative
- negative
3 papers more in this group
See all 7 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.