Abstract
The uptake and partitioning of nitrogen (N) by maize infected with the parasitic angiosperm, Striga hermonthica was investigated in sand culture in a glasshouse. The purpose was to determine the effect of Striga on N uptake and partitioning in maize. Maize was grown at 22, 66 and 133 mg N per plant and sampled five times. There was no significant StrigaiN interaction in any measured response. Leaf dry matter of Striga-infected maize, averaged over all N treatments, was 92 % that of uninfected maize at the four-leaf stage but by the 18-leaf stage it had decreased to 58 %. Similarly, stem dry matter of infected maize which was 91 % that of uninfected maize at the four-leaf stage was only 42 % at the 18-leaf stage. Root dry matter was similar for infected and uninfected maize. N concentration in the leaf, stem and root declined asymptotically from the first to the last sampling date for both infected and uninfected maize. The asymptotic value of N concentration in Striga-infected maize was 16 % greater in the leaf, 55 % in the stem, and 21 % in the root than in uninfected maize. The concentration of N in Striga was higher than in maize at the 16-and 18-leaf stages. Uptake of N was similar for infected and uninfected plants at the four-eight leaf stage but at the eight-12 leaf stage, N uptake by infected maize was 52 % that of uninfected maize. However, the proportion of total plant nitrogen partitioned to the root was greater (P 0n001) for Striga-infected maize. These results showed that the extent to which S. hermonthica reduced maize growth and N uptake, but increased the proportion of N partitioned to the roots, did not depend on the rate of N fertilizer applied.
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Claims 13
Claim · model-written summary
Leaf dry matter of Striga-infected maize decreased to 58 % of uninfected maize by the 18-leaf stage.
- Organ / stage
- Leafe2
- Treatment
- Striga-infectede2
- Interactor
- Striga hermonthica
Striga hermonthicae1parasite - Outcome
- Leaf dry mattere2
- Direction
- decreasede2
- Value
- 58 %e2
- Qualifier
- by the 18-leaf stagee2
- Comparator
- uninfected maizee2
- Setting
- sand culture in a glasshousee0
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“investigated in sand culture in a glasshouse”
e1“maize infected with the parasitic angiosperm, Striga hermonthica”
e2“Leaf dry matter of Striga-infected maize, averaged over all N treatments, was 92 % that of uninfected maize at the four-leaf stage but by the 18-leaf stage it had decreased to 58 %”
Claim · model-written summary
Stem dry matter of infected maize decreased to 42 % of uninfected maize at the 18-leaf stage.
- Organ / stage
- steme3
- Treatment
- infectede3
- Interactor
- Striga hermonthicaStriga hermonthicae1parasite
- Outcome
- stem dry mattere3
- Direction
- decreaseinferrede3
- Value
- 42 %e3
- Qualifier
- at the 18-leaf stagee3
- Comparator
- uninfected maizee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“maize infected with the parasitic angiosperm, Striga hermonthica”
e3“stem dry matter of infected maize which was 91 % that of uninfected maize at the four-leaf stage was only 42 % at the 18-leaf stage”
Claim · model-written summary
Root dry matter of infected maize was similar to that of uninfected maize.
- Treatment
- infectede4
- Interactor
- Striga hermonthicaStriga hermonthicae1parasite
- Outcome
- Root dry mattere4
- Direction
- similare4
- Comparator
- uninfected maizee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“maize infected with the parasitic angiosperm, Striga hermonthica”
e4“Root dry matter was similar for infected and uninfected maize”
Claim · model-written summary
N concentration in the leaf of Striga-infected maize was 16 % greater than in uninfected maize (asymptotic value).
- Organ / stage
- leafe5
- Treatment
- Striga-infectede5
- Interactor
- Striga hermonthicaStriga hermonthicae1parasite
- Outcome
- N concentratione5
- Direction
- greatere5
- Value
- 16 %e5
- Qualifier
- asymptotic valuee5
- Comparator
- uninfected maizee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“maize infected with the parasitic angiosperm, Striga hermonthica”
e5“The asymptotic value of N concentration in Striga-infected maize was 16 % greater in the leaf, 55 % in the stem, and 21 % in the root than in uninfected maize”
Claim · model-written summary
N concentration in the stem of Striga-infected maize was 55 % greater than in uninfected maize (asymptotic value).
- Organ / stage
- steme5
- Treatment
- Striga-infectede5
- Interactor
- Striga hermonthicaStriga hermonthicae1parasite
- Outcome
- N concentratione5
- Direction
- greatere5
- Value
- 55 %e5
- Qualifier
- asymptotic valuee5
- Comparator
- uninfected maizee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“maize infected with the parasitic angiosperm, Striga hermonthica”
e5“The asymptotic value of N concentration in Striga-infected maize was 16 % greater in the leaf, 55 % in the stem, and 21 % in the root than in uninfected maize”
Claim · model-written summary
N concentration in the root of Striga-infected maize was 21 % greater than in uninfected maize (asymptotic value).
- Organ / stage
- roote5
- Treatment
- Striga-infectede5
- Interactor
- Striga hermonthicaStriga hermonthicae1parasite
- Outcome
- N concentratione5
- Direction
- greatere5
- Value
- 21 %e5
- Qualifier
- asymptotic valuee5
- Comparator
- uninfected maizee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“maize infected with the parasitic angiosperm, Striga hermonthica”
e5“The asymptotic value of N concentration in Striga-infected maize was 16 % greater in the leaf, 55 % in the stem, and 21 % in the root than in uninfected maize”
Claim · model-written summary
N concentration in Striga was higher than in maize at the 16- and 18-leaf stages.
- Outcome
- concentration of N in Strigae6
- Direction
- highere6
- Qualifier
- 16-and 18-leaf stagese6
- Comparator
- maizee6
StrigaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“maize infected with the parasitic angiosperm, Striga hermonthica”
e6“The concentration of N in Striga was higher than in maize at the 16-and 18-leaf stages”
Claim · model-written summary
N uptake was similar in infected and uninfected plants at the four- to eight-leaf stage.
- Treatment
- infectede7
- Interactor
- Striga hermonthicaStriga hermonthicae1parasite
- Outcome
- Uptake of Ne7
- Direction
- similare7
- Qualifier
- at the four-eight leaf stagee7
- Comparator
- uninfected plantse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“maize infected with the parasitic angiosperm, Striga hermonthica”
e7“Uptake of N was similar for infected and uninfected plants at the four-eight leaf stage”
Claim · model-written summary
N uptake by infected maize decreased to 52 % of uninfected maize at the eight- to 12-leaf stage.
- Treatment
- infectede2
- Interactor
- Striga hermonthicaStriga hermonthicae1parasite
- Outcome
- N uptakee2
- Direction
- decreaseinferrede2
- Value
- 52 %e2
- Qualifier
- at the eight-12 leaf stagee2
- Comparator
- uninfected maizee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“maize infected with the parasitic angiosperm, Striga hermonthica”
e2“at the eight-12 leaf stage, N uptake by infected maize was 52 % that of uninfected maize”
Claim · model-written summary
Striga-infected maize partitioned a greater proportion of total plant nitrogen to the root.
- Treatment
- Striga-infectede2
- Interactor
- Striga hermonthicaStriga hermonthicae1parasite
- Outcome
- the proportion of total plant nitrogen partitioned to the roote2
- Direction
- greatere2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“maize infected with the parasitic angiosperm, Striga hermonthica”
e2“the proportion of total plant nitrogen partitioned to the root was greater (P 0n001) for Striga-infected maize”
Claim · model-written summary
The extent to which S. hermonthica reduced maize growth and N uptake did not depend on the rate of N fertilizer applied.
- Treatment
- rate of N fertilizere2
- Interactor
- S. hermonthicaStriga hermonthicae2parasite
- Outcome
- the extent to which S. hermonthica reduced maize growth and N uptakee2
- Direction
- did not depende2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“maize infected with the parasitic angiosperm, Striga hermonthica”
e2“the extent to which S. hermonthica reduced maize growth and N uptake, but increased the proportion of N partitioned to the roots, did not depend on the rate of N fertilizer applied”
Claim · model-written summary
There was no significant Striga-by-N interaction in any measured response in maize.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“maize infected with the parasitic angiosperm, Striga hermonthica”
e2“There was no significant StrigaiN interaction in any measured response”
Claim · model-written summary
N concentration in the leaf, stem and root declined asymptotically over sampling dates in both infected and uninfected maize.
- Organ / stage
- leaf, stem and roote2
- Outcome
- N concentratione2
- Direction
- declinede2
- Qualifier
- asymptotically from the first to the last sampling datee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“maize infected with the parasitic angiosperm, Striga hermonthica”
e2“N concentration in the leaf, stem and root declined asymptotically from the first to the last sampling date for both infected and uninfected maize”
The same questions in other papers
Striga · growth · Zea mays (maize)Results agree
7 papers in the same direction as this paper
- negative
- no effect
- negative
4 papers more in this group
See all 8 papers →infection · Striga hermonthica · Zea mays (maize)Positive and negative results
4 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- negative
2 papers more in this group
See all 6 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.