Abstract
Little is known about the effects of nitrogen supply on plant productivity and defensive response to pathogen exposure. Here, tuber yield and resistance to the fungal pathogen Phytophthora infestans were investigated in potato plants supplied with four different nitrogen levels (N1: 45 kg-hm-2, N2: 90 kg-hm-2, N3: 135 kg-hm-2, and N4: 180 kg-hm-2). The N2 level of nitrogen promoted the highest tuber yield and largest tubers under pathogen-free conditions. However, N3 promoted the strongest pathogen resistance and highest potato production in response to P. infestans exposure. Also, the highest level of chlorophyll accumulation was observed with N3 relative to the other treatment groups under pathogen-infected but not pathogen-free conditions. Further study showed that, in response to pathogen infection, the N3 level of nitrogen induced the highest activity levels for the defensive enzymes polyphenol oxidase and phenylalanine ammonia-lyase (but not chitinase and β-1,3-glucanase) and the most abundant accumulation of phenolic and flavonoid compounds. Our data demonstrated that modest increases in the nitrogen supply provided potato plants with optimum growth and defensive capability in response to P. infestans exposure. Key words: Nitrogen, tuber yield, pathogen resistance, Phytophthora infestans, Solanum tuberosum.
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Claims 9
Claim · model-written summary
N2 gave the highest potato tuber yield without pathogen exposure.
- Taxon
- potato
Solanum tuberosumt0 - Treatment
- N2 level of nitrogene0
- Outcome
- tuber yielde0
- Direction
- higheste0
- Qualifier
- under pathogen-free conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N2 level of nitrogen promoted the highest tuber yield and largest tubers under pathogen-free conditions.”
t0“potato yield”
Claim · model-written summary
N2 gave the largest potato tubers without pathogen exposure.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- N2 level of nitrogene0
- Outcome
- tuberse0
- Direction
- largeste0
- Qualifier
- under pathogen-free conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The N2 level of nitrogen promoted the highest tuber yield and largest tubers under pathogen-free conditions.”
t0“potato yield”
Claim · model-written summary
N3 gave the strongest potato resistance to P. infestans.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- N3e0
- Interactor
- P. infestans
Phytophthora infestanse0pathogen - Outcome
- pathogen resistancee0
- Direction
- strongeste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N3 promoted the strongest pathogen resistance and highest potato production in response to P. infestans exposure.”
Claim · model-written summary
N3 gave the highest potato production under P. infestans exposure.
- Taxon
- potatoSolanum tuberosume0
- Treatment
- N3e0
- Interactor
- P. infestansPhytophthora infestanse0pathogen
- Outcome
- potato productione0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N3 promoted the strongest pathogen resistance and highest potato production in response to P. infestans exposure.”
Claim · model-written summary
N3 produced the highest chlorophyll accumulation under pathogen infection, but not in pathogen-free conditions.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- N3e0
- Outcome
- chlorophyll accumulatione0
- Direction
- higheste0
- Qualifier
- under pathogen-infected but not pathogen-free conditionse0
- Comparator
- other treatment groupse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest level of chlorophyll accumulation was observed with N3 relative to the other treatment groups under pathogen-infected but not pathogen-free conditions.”
t0“potato yield”
Claim · model-written summary
N3 produced the highest polyphenol oxidase and phenylalanine ammonia-lyase activities during pathogen infection.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- N3 level of nitrogene0
- Outcome
- activity levels for the defensive enzymes polyphenol oxidase and phenylalanine ammonia-lyasee0
- Direction
- higheste0
- Qualifier
- in response to pathogen infectione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in response to pathogen infection, the N3 level of nitrogen induced the highest activity levels for the defensive enzymes polyphenol oxidase and phenylalanine ammonia-lyase (but not chitinase and β-1,3-glucanase)”
t0“potato yield”
Claim · model-written summary
N3 did not produce the highest chitinase and β-1,3-glucanase activities during infection.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- N3 level of nitrogene0
- Outcome
- chitinase and β-1,3-glucanasee0
- Direction
- but note0
- Qualifier
- in response to pathogen infectione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in response to pathogen infection, the N3 level of nitrogen induced the highest activity levels for the defensive enzymes polyphenol oxidase and phenylalanine ammonia-lyase (but not chitinase and β-1,3-glucanase)”
t0“potato yield”
Claim · model-written summary
N3 gave the most abundant phenolic and flavonoid accumulation during pathogen infection.
- Taxon
- potatoSolanum tuberosumt0
- Treatment
- N3 level of nitrogene0
- Outcome
- accumulation of phenolic and flavonoid compoundse0
- Direction
- most abundante0
- Qualifier
- in response to pathogen infectione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in response to pathogen infection, the N3 level of nitrogen induced the highest activity levels for the defensive enzymes polyphenol oxidase and phenylalanine ammonia-lyase (but not chitinase and β-1,3-glucanase) and the most abundant accumulation of phenolic and flavonoid compounds.”
t0“potato yield”
Claim · model-written summary
The authors conclude modest nitrogen increases optimise potato growth and defensive capability under P. infestans exposure.
- Taxon
- potatoSolanum tuberosume0
- Interactor
- P. infestansPhytophthora infestanse0pathogen
- Outcome
- modest increases in the nitrogen supply provided potato plants with optimum growth and defensive capabilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“modest increases in the nitrogen supply provided potato plants with optimum growth and defensive capability in response to P. infestans exposure”
The same questions in other papers
nitrogen · yield · Solanum tuberosum (potato)Results differ
108 papers in the same direction as this paper · 20 in the opposite direction · 3 reporting no difference from an alternative
- no effect
- negative
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2 papers in the same direction as this paper · 2 in the opposite direction
- negative
- negative
- positive
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.