Abstract
Seedlings of Ricinus communis L. cultivated in quartz sand were supplied with a nutrient solution containing either 0.2 mol m−3NO3- or 4.0 mol m−3NO3- as the nitrogen source to obtain insufficiently (low supply, nitrogen-limited) or well-fed plants (high supply, control). During the period between 41 and 51 d after sowing, the flows of C, N and inorganic ions between root and shoot were modelled on the basis of empirical observation and expressed on a fresh weight basis. With a low nitrate supply the biomass production was decreased while the root/shoot ratio was drastically increased and the water content in the shoot was slightly reduced. Nitrogen was transported in the xylem mainly in the form of nitrate in both treatments. However, in nitrate-limited plants the ratio of nitrate to total nitrogen was lower, indicating a higher fraction of whole-plant nitrate reduction occurring in the root. The spectrum of amino acids in phloem sap was changed due to N-limitation. Nitrate and cation uptake, as well as photosynthesis was strongly decreased in nitrate-limited plants. The partitioning of C, N and ions was shifted in favour of the root compared to well-fed plants. Transport of C, N, and cations in the xylem was decreased. Flows of ions and elements in the phloem were increased relative to uptake and xylem transport. In contrast, the chloride flows were nearly the same in low- and well-fed plants, pointing to a role of chloride as a compensating ion for nitrate.
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Claims 13
Claim · model-written summary
Low nitrate supply decreased biomass production of Ricinus communis seedlings.
- Taxon
- Ricinus communis
Ricinus communise0 - Treatment
- low nitrate supplye2
- Outcome
- biomass productione2
- Direction
- decreasede2
- Comparator
- well-fed plantse1
- Setting
- quartz sande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Ricinus communis L. cultivated in quartz sand”
e1“or well-fed plants (high supply, control)”
e2“With a low nitrate supply the biomass production was decreased while the root/shoot ratio was drastically increased and the water content in the shoot was slightly reduced”
Claim · model-written summary
Low nitrate supply drastically increased the root/shoot ratio of Ricinus communis seedlings.
- Taxon
- Ricinus communisRicinus communise0
- Treatment
- low nitrate supplye2
- Outcome
- root/shoot ratioe2
- Direction
- increasede2
- Comparator
- well-fed plantse1
- Setting
- quartz sande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Ricinus communis L. cultivated in quartz sand”
e1“or well-fed plants (high supply, control)”
e2“With a low nitrate supply the biomass production was decreased while the root/shoot ratio was drastically increased and the water content in the shoot was slightly reduced”
Claim · model-written summary
Low nitrate supply slightly reduced the water content in the shoot of Ricinus communis seedlings.
- Taxon
- Ricinus communisRicinus communise0
- Treatment
- low nitrate supplye2
- Outcome
- water content in the shoote2
- Direction
- reducede2
- Comparator
- well-fed plantse1
- Setting
- quartz sande0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Ricinus communis L. cultivated in quartz sand”
e1“or well-fed plants (high supply, control)”
e2“With a low nitrate supply the biomass production was decreased while the root/shoot ratio was drastically increased and the water content in the shoot was slightly reduced”
Claim · model-written summary
Nitrogen was transported in the xylem mainly as nitrate in both nitrogen treatments.
- Taxon
- Ricinus communisRicinus communise0
- Outcome
- transported in the xyleme3
- Qualifier
- mainly in the form of nitratee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Ricinus communis L. cultivated in quartz sand”
e3“Nitrogen was transported in the xylem mainly in the form of nitrate in both treatments”
Claim · model-written summary
In nitrate-limited plants the ratio of nitrate to total nitrogen was lower.
- Taxon
- Ricinus communisRicinus communise0
- Treatment
- nitrate-limitede4
- Outcome
- ratio of nitrate to total nitrogene4
- Direction
- lowere4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Ricinus communis L. cultivated in quartz sand”
e4“However, in nitrate-limited plants the ratio of nitrate to total nitrogen was lower, indicating a higher fraction of whole-plant nitrate reduction occurring in the root”
Claim · model-written summary
The lower nitrate to total nitrogen ratio indicates a higher fraction of whole-plant nitrate reduction occurring in the root.
- Taxon
- Ricinus communisRicinus communise0
- Organ / stage
- roote4
- Outcome
- whole-plant nitrate reduction occurring in the roote4
- Qualifier
- higher fractione4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Ricinus communis L. cultivated in quartz sand”
e4“However, in nitrate-limited plants the ratio of nitrate to total nitrogen was lower, indicating a higher fraction of whole-plant nitrate reduction occurring in the root”
Claim · model-written summary
Nitrogen limitation changed the spectrum of amino acids in phloem sap of Ricinus communis.
- Taxon
- Ricinus communisRicinus communise0
- Treatment
- N-limitatione5
- Outcome
- spectrum of amino acids in phloem sape5
- Direction
- changede5
- Comparator
- well-fed plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Ricinus communis L. cultivated in quartz sand”
e1“or well-fed plants (high supply, control)”
e5“The spectrum of amino acids in phloem sap was changed due to N-limitation”
Claim · model-written summary
Nitrate and cation uptake and photosynthesis were strongly decreased in nitrate-limited plants.
- Taxon
- Ricinus communisRicinus communise0
- Treatment
- nitrate-limited plantse6
- Outcome
- Nitrate and cation uptake, as well as photosynthesise6
- Direction
- decreasede6
- Comparator
- well-fed plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Ricinus communis L. cultivated in quartz sand”
e1“or well-fed plants (high supply, control)”
e6“Nitrate and cation uptake, as well as photosynthesis was strongly decreased in nitrate-limited plants”
Claim · model-written summary
Nitrogen limitation shifted the partitioning of C, N and ions in favour of the root.
- Taxon
- Ricinus communisRicinus communise0
- Outcome
- partitioning of C, N and ionse7
- Direction
- shifted in favour of the roote7
- Comparator
- well-fed plantse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Ricinus communis L. cultivated in quartz sand”
e7“The partitioning of C, N and ions was shifted in favour of the root compared to well-fed plants”
Claim · model-written summary
Transport of C, N and cations in the xylem was decreased under nitrogen limitation.
- Taxon
- Ricinus communisRicinus communise0
- Organ / stage
- xyleme6
- Outcome
- Transport of C, N, and cations in the xyleme6
- Direction
- decreasede6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Ricinus communis L. cultivated in quartz sand”
e6“Transport of C, N, and cations in the xylem was decreased”
Claim · model-written summary
Flows of ions and elements in the phloem were increased relative to uptake and xylem transport.
- Taxon
- Ricinus communisRicinus communise0
- Organ / stage
- phloeme6
- Outcome
- Flows of ions and elements in the phloeme6
- Direction
- increasede6
- Comparator
- uptake and xylem transporte6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Ricinus communis L. cultivated in quartz sand”
e6“Flows of ions and elements in the phloem were increased relative to uptake and xylem transport”
Claim · model-written summary
Chloride flows were nearly the same in low- and well-fed Ricinus communis plants.
- Taxon
- Ricinus communisRicinus communise0
- Outcome
- chloride flowse6
- Direction
- nearly the samee6
- Comparator
- well-fed plantse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Ricinus communis L. cultivated in quartz sand”
e6“In contrast, the chloride flows were nearly the same in low- and well-fed plants, pointing to a role of chloride as a compensating ion for nitrate”
Claim · model-written summary
Chloride may act as a compensating ion for nitrate in Ricinus communis.
- Taxon
- Ricinus communisRicinus communise0
- Compound
- chloridee6
- Outcome
- a role of chloride as a compensating ion for nitratee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Seedlings of Ricinus communis L. cultivated in quartz sand”
e6“In contrast, the chloride flows were nearly the same in low- and well-fed plants, pointing to a role of chloride as a compensating ion for nitrate”
The same questions in other papers
nitrogen · yield · Ricinus communis (castor bean)Positive and negative results
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See all 34 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.