Abstract
As the most severe forestry quarantine disease in several countries, pine wilt disease (PWD) causes substantial economic losses and poses a significant threat to the forest ecosystem. It is necessary to find a rapid and sensitive method for the early diagnosis of the disease to control the development of the disease effectively. This paper investigated the effect of Bursaphelenchus xylophilus (the pinewood nematode; PWN) on the chlorophyll fluorescence kinetic curve (OJIP curve) and the parameters of needles using four-year-old Pinus thunbergii as experimental materials and chlorophyll fluorescence analysis as a technical tool. It was shown by the results in the OJIP curve that the fluorescence intensity of the inoculated plants was significantly increased at points O and I. Additionally, the relative variable fluorescence intensity at points K and J was comparable to that of the control plants. Several chlorophyll fluorescence parameters of the treatment significantly increased or decreased with disease progression. At the same time, the control group had no significant changes in each parameter. Therefore, chlorophyll fluorescence parameters can be used as indicators for the early diagnosis of PWD, among which the DIo/RC parameter was the best. In summary, PWN invasion will produce fluorescence on the PSII of P. thunbergii, and its chlorophyll fluorescence parameters are expected to achieve early PWD diagnosis.
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Claims 5
Claim · model-written summary
Nematode inoculation significantly increased pine fluorescence at O and I.
- Taxon
- Pinus thunbergii
Pinus thunbergiit0 - Organ / stage
- points O and Ie0
- Treatment
- inoculatede0
- Interactor
- Bursaphelenchus xylophilus
Bursaphelenchus xylophiluse1pathogen - Outcome
- fluorescence intensitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the fluorescence intensity of the inoculated plants was significantly increased at points O and I”
t0“Pinus thunbergii Based on Chlorophyll Fluorescence Parameters”
e1“Bursaphelenchus xylophilus (the pinewood nematode; PWN)”
Claim · model-written summary
Relative fluorescence at K and J was comparable to controls.
- Taxon
- Pinus thunbergiiPinus thunbergiit0
- Treatment
- Bursaphelenchus xylophiluse1
- Interactor
- Bursaphelenchus xylophilusBursaphelenchus xylophiluse1pathogen
- Outcome
- relative variable fluorescence intensity at points K and Je0
- Direction
- comparablee0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the relative variable fluorescence intensity at points K and J was comparable to that of the control plants”
t0“Pinus thunbergii Based on Chlorophyll Fluorescence Parameters”
e1“Bursaphelenchus xylophilus (the pinewood nematode; PWN)”
Claim · model-written summary
Several fluorescence parameters changed significantly as disease progressed.
- Taxon
- Pinus thunbergiiPinus thunbergiit0
- Treatment
- disease progressione0
- Interactor
- Bursaphelenchus xylophilusBursaphelenchus xylophiluse1pathogen
- Outcome
- chlorophyll fluorescence parameterse0
- Direction
- increased or decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Several chlorophyll fluorescence parameters of the treatment significantly increased or decreased with disease progression”
t0“Pinus thunbergii Based on Chlorophyll Fluorescence Parameters”
e1“Bursaphelenchus xylophilus (the pinewood nematode; PWN)”
Claim · model-written summary
Control fluorescence parameters did not change significantly.
- Taxon
- Pinus thunbergiiPinus thunbergiit0
- Outcome
- each parametere0
- Direction
- no significant changese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the control group had no significant changes in each parameter”
t0“Pinus thunbergii Based on Chlorophyll Fluorescence Parameters”
Claim · model-written summary
DIo/RC was the best fluorescence parameter for early diagnosis.
- Taxon
- Pinus thunbergiiPinus thunbergiit0
- Outcome
- early diagnosis of PWDe0
- Direction
- the beste0
- Qualifier
- DIo/RC parametere0
- Comparator
- chlorophyll fluorescence parameterse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chlorophyll fluorescence parameters can be used as indicators for the early diagnosis of PWD, among which the DIo/RC parameter was the best”
t0“Pinus thunbergii Based on Chlorophyll Fluorescence Parameters”
The same questions in other papers
inoculation · Bursaphelenchus xylophilus · Pinus thunbergii (Japanese black pine)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
1 paper more in this group
See all 5 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.