Abstract
Abstract A previous study demonstrated that cabbage was P efficient compared to carrot and potato. However, calculating plant P uptake by a mechanistic simulation model based on P transport by diffusion and mass flow, P uptake of roots according to the Michaelis‐Menten kinetics, and morphological root characteristics including root hairs, revealed that these parameters could explain only 2/5 of the total P uptake of cabbage, but 4/5 of that of carrot and potato ( Dechassa et al., 2003). Therefore, it was hypothesized that a higher root exudation of organic anions may enhance P mobilization and hence P uptake of cabbage. The objective of this research was to determine root exudation of organic anions by the three species, and to investigate the influence of plant age and dark/light period on organic‐anion exudation by cabbage. Experiments were conducted in a growth chamber in nutrient solution with or without P. Organic anions were determined in root exudates and in root tissue. With cabbage and potato, P deficiency induced exudation of citrate and succinate, respectively. Citrate‐exudation rate of P‐deficient cabbage plants was correlated with accumulation of citrate in root tissue. In contrast, high succinate‐exudation rates in potato were not correlated with an increased concentration in root tissue. For carrot, no change was observed in the exudation of any of the organic anions in response to P deficiency. The results also showed that succinate‐ and citrate‐exudation rates of cabbage roots increased with increased plant age. There was also a significant increase in exudation rates of organic anions of cabbage roots during the light period of the day. It was concluded that cabbage had the ability to exude large amounts of citrate in response to P deficiency by which it can additionally enhance its P‐uptake efficiency, whereas carrot and potato showed little evidence of possessing such a mechanism.
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Claims 9
Claim · model-written summary
Phosphorus deficiency induced citrate exudation in cabbage.
- Taxon
- cabbage
Brassica oleracea var. capitatae0 - Treatment
- P deficiencye0
- Outcome
- exudation of citratee0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With cabbage and potato, P deficiency induced exudation of citrate and succinate, respectively.”
Claim · model-written summary
Phosphorus deficiency induced succinate exudation in potato.
- Taxon
- potato
Solanum tuberosume0 - Treatment
- P deficiencye0
- Outcome
- exudation of citrate and succinatee0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With cabbage and potato, P deficiency induced exudation of citrate and succinate, respectively.”
Claim · model-written summary
Cabbage citrate exudation rate correlated with root tissue citrate accumulation.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Organ / stage
- root tissuee0
- Outcome
- Citrate‐exudation ratee0
- Qualifier
- P‐deficiente0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Citrate‐exudation rate of P‐deficient cabbage plants was correlated with accumulation of citrate in root tissue.”
Claim · model-written summary
Potato succinate exudation did not correlate with increased root tissue concentration.
- Taxon
- potatoSolanum tuberosume0
- Organ / stage
- root tissuee0
- Outcome
- succinate‐exudation ratese0
- Direction
- not correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high succinate‐exudation rates in potato were not correlated with an increased concentration in root tissue.”
Claim · model-written summary
Carrot organic-anion exudation did not change under phosphorus deficiency.
- Taxon
- carrot
Daucus carotae0 - Treatment
- P deficiencye0
- Outcome
- exudation of any of the organic anionse0
- Direction
- no changee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For carrot, no change was observed in the exudation of any of the organic anions in response to P deficiency.”
Claim · model-written summary
Cabbage succinate and citrate exudation rates increased with plant age.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Organ / stage
- cabbage rootse0
- Outcome
- succinate‐ and citrate‐exudation ratese0
- Direction
- increasede0
- Qualifier
- increased plant agee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“succinate‐ and citrate‐exudation rates of cabbage roots increased with increased plant age.”
Claim · model-written summary
Cabbage root organic-anion exudation increased during the light period.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Organ / stage
- rootse0
- Outcome
- exudation rates of organic anionse0
- Direction
- increasee0
- Qualifier
- light period of the daye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“significant increase in exudation rates of organic anions of cabbage roots during the light period of the day.”
Claim · model-written summary
Authors conclude cabbage citrate exudation under phosphorus deficiency can enhance phosphorus uptake efficiency.
- Taxon
- cabbageBrassica oleracea var. capitatae0
- Treatment
- P deficiencye0
- Outcome
- P‐uptake efficiencye0
- Qualifier
- exude large amounts of citratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cabbage had the ability to exude large amounts of citrate in response to P deficiency by which it can additionally enhance its P‐uptake efficiency”
Claim · model-written summary
Carrot and potato showed little evidence of that citrate-based uptake mechanism.
- Taxon
- carrotDaucus carotae0
- Outcome
- little evidence of possessing such a mechanisme0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“carrot and potato showed little evidence of possessing such a mechanism.”
The same questions in other papers
phosphorus · molecular: metabolites · Daucus carota (carrot)Positive and negative results
2 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- 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.