Abstract
In tomato seedlings ( Lycopersicon esculentum Mill. cv. Lukullus), phosphate mobilizing enzymes (acid phosphatase, phytase and ribonuclease) responded to the absence of an exogenous phosphate source with a remarkable increase in their specific activities. The definite beginning of a stress response on the level of enzyme activity was revealed at day 10 after sowing. The increase was tightly controlled by the decline of the free cellular phosphate level. Thus, in phosphate‐deficient roots derived from 14‐d‐old seedlings, the enzyme activities were up to 32‐fold higher than in the control plants. Only 7% of the free cellular phosphate content of control roots was measured in this part of the plants. However, phosphate‐starved plants do not show visible deficiency symptoms at this stage. In addition, we found that phosphohydrolases reached their maximum specific activity early in germination, independent of the exogenous phosphate supply. Furthermore, acid phosphatase and ribonuclease isoforms exhibited different patterns depending on the nutrient supply, as well as on the developmental stage. The results of this work allow us to compare the responses of whole tomato plants following phosphate deprivation with those of a homologous suspension cell culture recently examined.
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Claims 7
Claim · model-written summary
Without exogenous phosphate, three phosphate mobilizing enzyme activities increased.
- Taxon
- tomato
Solanum lycopersicumt0 - Treatment
- absence of an exogenous phosphate sourcee0
- Gene
- acid phosphatase, phytase and ribonucleasee0
- Outcome
- specific activitiese0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phosphate mobilizing enzymes (acid phosphatase, phytase and ribonuclease) responded to the absence of an exogenous phosphate source with a remarkable increase in their specific activities”
t0“tomato seedlings”
Claim · model-written summary
The enzyme activity stress response began on day 10 after sowing.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- stress response on the level of enzyme activitye0
- Value
- day 10 after sowinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The definite beginning of a stress response on the level of enzyme activity was revealed at day 10 after sowing”
t0“tomato seedlings”
Claim · model-written summary
In phosphate deficient roots of 14 day seedlings, enzyme activities were up to 32 fold higher than controls.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- rootse0
- Treatment
- phosphate‐deficiente0
- Outcome
- enzyme activitiese0
- Direction
- highere0
- Value
- up to 32‐folde0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in phosphate‐deficient roots derived from 14‐d‐old seedlings, the enzyme activities were up to 32‐fold higher than in the control plants”
t0“tomato seedlings”
Claim · model-written summary
Free cellular phosphate in deficient roots was 7% of control roots.
- Taxon
- tomatoSolanum lycopersicumt0
- Outcome
- free cellular phosphate contente0
- Direction
- lowerinferrede0
- Value
- 7%e0
- Comparator
- control rootse0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Only 7% of the free cellular phosphate content of control roots was measured in this part of the plants”
t0“tomato seedlings”
Claim · model-written summary
Phosphate starved plants lacked visible deficiency symptoms at this stage.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- phosphate‐starvede0
- Outcome
- do not show visible deficiency symptomse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phosphate‐starved plants do not show visible deficiency symptoms at this stage”
t0“tomato seedlings”
Claim · model-written summary
Phosphohydrolases reached maximum specific activity early in germination regardless of phosphate supply.
- Taxon
- tomatoSolanum lycopersicumt0
- Organ / stage
- germinatione0
- Outcome
- maximum specific activitye0
- Direction
- maximume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“phosphohydrolases reached their maximum specific activity early in germination, independent of the exogenous phosphate supply”
t0“tomato seedlings”
Claim · model-written summary
Acid phosphatase and ribonuclease isoforms varied with nutrient supply and developmental stage.
- Taxon
- tomatoSolanum lycopersicumt0
- Treatment
- nutrient supplye0
- Gene
- acid phosphatase and ribonucleasee0
- Outcome
- different patternse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“acid phosphatase and ribonuclease isoforms exhibited different patterns depending on the nutrient supply, as well as on the developmental stage”
t0“tomato seedlings”
The same questions in other papers
phosphorus · soil: biology · Solanum lycopersicum (tomato)Positive and negative results
4 papers in the same direction as this paper · 3 in the opposite direction
- negative
- no effect
- negative
4 papers more in this group
See all 8 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.