Abstract
The threshold of tolerance for nitrate of the parasitic weed Striga hermonthica (Del.) Benth and the host plant Sorghum bicolor L. was determined by estimating the impact of increasing nitrate loads on plant growth and various parameters of C and N assimilation. Nitrate supply improved chlorophyll (Chl) content and photosystem II (PSII) photochemistry of infected S. bicolor that, in comparison to S. hermonthica, displayed a low imbalance between C and N assimilation when nitrate was supplied up to 1500 mg N per plant. Indeed, nitrate supplies increased strongly the leaf N:C ratio of the parasite. The higher nitrate load induced strong accumulation of nitrate, nitrite and ammonium, and consequently the death of S. hermonthica. Nevertheless, lower nitrate loads (up to 500 mg N per S. bicolor in this study) promoted leaf expansion, PSII photochemistry and N metabolism of S. hermonthica mature (M) plants, as attested by the significant rise in soluble protein and free amino-acid contents. Following these N supplies, the nitrate tolerance of S. hermonthica was correlated with an increase in PSII activity and a high incorporation of N excess into asparagine. This confirmed the central role of asparagine in the N metabolism of S. hermonthica, although this detoxification pathway was insufficient to limit ammonium accumulation under higher nitrate loads.
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Claims 12
Claim · model-written summary
Nitrate improved chlorophyll content of infected Sorghum bicolor.
- Taxon
- Sorghum bicolor L.
Sorghum bicolort0 - Treatment
- nitratee0
- Interactor
- Striga hermonthica
Striga hermonthicat0parasite - Outcome
- chlorophyll (Chl) contente0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Striga hermonthica (Del.) Benth (Scrophulariaceae) and its host Sorghum bicolor L.”
e0“Nitrate supply improved chlorophyll (Chl) content and photosystem II (PSII) photochemistry of infected S. bicolor”
Claim · model-written summary
Nitrate improved photosystem II photochemistry of infected Sorghum bicolor.
- Taxon
- Sorghum bicolor L.Sorghum bicolort0
- Treatment
- nitratee0
- Interactor
- Striga hermonthicaStriga hermonthicat0parasite
- Outcome
- photosystem II (PSII) photochemistrye0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Striga hermonthica (Del.) Benth (Scrophulariaceae) and its host Sorghum bicolor L.”
e0“Nitrate supply improved chlorophyll (Chl) content and photosystem II (PSII) photochemistry of infected S. bicolor”
Claim · model-written summary
Nitrate strongly increased the leaf nitrogen to carbon ratio of Striga hermonthica.
- Taxon
- Striga hermonthica (Del.) Benth (Scrophulariaceae)Striga hermonthicat0
- Treatment
- nitratee0
- Interactor
- Sorghum bicolor L.Sorghum bicolort0host
- Outcome
- leaf N:C ratioe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Striga hermonthica (Del.) Benth (Scrophulariaceae) and its host Sorghum bicolor L.”
e0“nitrate supplies increased strongly the leaf N:C ratio of the parasite”
Claim · model-written summary
Higher nitrate load caused nitrate accumulation in Striga hermonthica.
- Taxon
- Striga hermonthica (Del.) Benth (Scrophulariaceae)Striga hermonthicat0
- Treatment
- nitratee0
- Interactor
- Sorghum bicolor L.Sorghum bicolort0host
- Outcome
- nitratee0
- Direction
- accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Striga hermonthica (Del.) Benth (Scrophulariaceae) and its host Sorghum bicolor L.”
e0“higher nitrate load induced strong accumulation of nitrate, nitrite and ammonium”
Claim · model-written summary
Higher nitrate load caused nitrite accumulation in Striga hermonthica.
- Taxon
- Striga hermonthica (Del.) Benth (Scrophulariaceae)Striga hermonthicat0
- Treatment
- nitratee0
- Interactor
- Sorghum bicolor L.Sorghum bicolort0host
- Outcome
- nitritee0
- Direction
- accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Striga hermonthica (Del.) Benth (Scrophulariaceae) and its host Sorghum bicolor L.”
e0“higher nitrate load induced strong accumulation of nitrate, nitrite and ammonium”
Claim · model-written summary
Higher nitrate load caused ammonium accumulation in Striga hermonthica.
- Taxon
- Striga hermonthica (Del.) Benth (Scrophulariaceae)Striga hermonthicat0
- Treatment
- nitratee0
- Interactor
- Sorghum bicolor L.Sorghum bicolort0host
- Outcome
- ammoniume0
- Direction
- accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Striga hermonthica (Del.) Benth (Scrophulariaceae) and its host Sorghum bicolor L.”
e0“higher nitrate load induced strong accumulation of nitrate, nitrite and ammonium”
Claim · model-written summary
Higher nitrate load caused death of Striga hermonthica.
- Taxon
- Striga hermonthica (Del.) Benth (Scrophulariaceae)Striga hermonthicat0
- Treatment
- nitratee0
- Interactor
- Sorghum bicolor L.Sorghum bicolort0host
- Outcome
- death of S. hermonthicae0
- Direction
- accumulatione0
- Qualifier
- higher nitrate loade0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Striga hermonthica (Del.) Benth (Scrophulariaceae) and its host Sorghum bicolor L.”
e0“higher nitrate load induced strong accumulation of nitrate, nitrite and ammonium, and consequently the death of S. hermonthica”
Claim · model-written summary
Lower nitrate loads promoted leaf expansion in mature Striga hermonthica.
- Taxon
- Striga hermonthica (Del.) Benth (Scrophulariaceae)Striga hermonthicat0
- Treatment
- nitratee0
- Interactor
- Sorghum bicolor L.Sorghum bicolort0host
- Outcome
- leaf expansione0
- Direction
- promotede0
- Qualifier
- lower nitrate loads (up to 500 mg N per S. bicolor in this study)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Striga hermonthica (Del.) Benth (Scrophulariaceae) and its host Sorghum bicolor L.”
e0“lower nitrate loads (up to 500 mg N per S. bicolor in this study) promoted leaf expansion, PSII photochemistry and N metabolism of S. hermonthica mature (M) plants”
Claim · model-written summary
Lower nitrate loads promoted PSII photochemistry in mature Striga hermonthica.
- Taxon
- Striga hermonthica (Del.) Benth (Scrophulariaceae)Striga hermonthicat0
- Treatment
- nitratee0
- Interactor
- Sorghum bicolor L.Sorghum bicolort0host
- Outcome
- PSII photochemistrye0
- Direction
- promotede0
- Qualifier
- lower nitrate loads (up to 500 mg N per S. bicolor in this study)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Striga hermonthica (Del.) Benth (Scrophulariaceae) and its host Sorghum bicolor L.”
e0“lower nitrate loads (up to 500 mg N per S. bicolor in this study) promoted leaf expansion, PSII photochemistry and N metabolism of S. hermonthica mature (M) plants”
Claim · model-written summary
Lower nitrate loads promoted N metabolism in mature Striga hermonthica.
- Taxon
- Striga hermonthica (Del.) Benth (Scrophulariaceae)Striga hermonthicat0
- Treatment
- nitratee0
- Interactor
- Sorghum bicolor L.Sorghum bicolort0host
- Outcome
- N metabolisme0
- Direction
- promotede0
- Qualifier
- lower nitrate loads (up to 500 mg N per S. bicolor in this study)e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Striga hermonthica (Del.) Benth (Scrophulariaceae) and its host Sorghum bicolor L.”
e0“lower nitrate loads (up to 500 mg N per S. bicolor in this study) promoted leaf expansion, PSII photochemistry and N metabolism of S. hermonthica mature (M) plants”
Claim · model-written summary
Lower nitrate loads significantly raised soluble protein in Striga hermonthica.
- Taxon
- Striga hermonthica (Del.) Benth (Scrophulariaceae)Striga hermonthicat0
- Treatment
- nitratee1
- Interactor
- Sorghum bicolor L.Sorghum bicolort0host
- Outcome
- soluble proteine0
- Direction
- risee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Striga hermonthica (Del.) Benth (Scrophulariaceae) and its host Sorghum bicolor L.”
e0“significant rise in soluble protein and free amino-acid contents”
e1“Nitrate supply improved chlorophyll (Chl) content and photosystem II (PSII) photochemistry of infected S. bicolor”
Claim · model-written summary
Lower nitrate loads significantly raised free amino-acid contents in Striga hermonthica.
- Taxon
- Striga hermonthica (Del.) Benth (Scrophulariaceae)Striga hermonthicat0
- Treatment
- nitratee1
- Interactor
- Sorghum bicolor L.Sorghum bicolort0host
- Outcome
- free amino-acid contentse0
- Direction
- risee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Striga hermonthica (Del.) Benth (Scrophulariaceae) and its host Sorghum bicolor L.”
e0“significant rise in soluble protein and free amino-acid contents”
e1“Nitrate supply improved chlorophyll (Chl) content and photosystem II (PSII) photochemistry of infected S. bicolor”
The same questions in other papers
nitrogen · Striga hermonthica · Sorghum bicolor (sorghum)Results agree
2 papers in the same direction as this paper
- 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.