Abstract
Soybean plants (Glycine max [L.] Merr var Amsoy 71) were grown in growth chambers with high-phosphorus (high-P) and low-phosphorus (low-P) culture solutions. Low-P treatment reduced shoot growth significantly 7 days after treatment began. Root growth was much less affected by low-P, there being no significant reduction in root growth rate until 17 days had elapsed. The results suggest that low-P treatment decreased soybean growth primarily through an effect on the expansion of the leaf surface which was diminished by 85%, the main effect of low-P being on the rate of expansion of individual leaves. Low-P had a lesser effect on photosynthesis; light saturated photosynthetic rates at ambient and saturating CO(2) levels were lowered by 55 and 45%, respectively, after 19 days of low-P treatment. Low-P treatment increased starch concentrations in mature leaves, expanding leaves and fibrous roots; sucrose concentrations, however, were reduced by low-P in leaves and increased in roots. Foliar F-2,6-BP levels were not affected by P treatment in the light but in darkness they increased with high-P and decreased with low-P. The increase in the starch/sucrose ratio in low-P leaves was correlated primarily with changes in the total activities of enzymes of starch and sucrose metabolism.
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Claims 12
Claim · model-written summary
Low phosphorus significantly reduced shoot growth after seven days.
- Taxon
- Glycine max
Glycine maxt0 - Treatment
- Low-P treatmente0
- Outcome
- shoot growthe0
- Direction
- reducede0
- Qualifier
- 7 days after treatment begane0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low-P treatment reduced shoot growth significantly 7 days after treatment began”
t0“Glycine max”
Claim · model-written summary
Root growth rate had no significant reduction until day 17.
- Taxon
- Glycine maxGlycine maxt0
- Treatment
- low-Pe1
- Outcome
- root growth ratee0
- Direction
- no significant reductione0
- Qualifier
- until 17 days had elapsede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant reduction in root growth rate until 17 days had elapsed”
t0“Glycine max”
e1“Low-P treatment reduced shoot growth significantly 7 days after treatment began”
Claim · model-written summary
Low phosphorus diminished leaf surface expansion by 85%.
- Taxon
- Glycine maxGlycine maxt0
- Treatment
- low-Pe1
- Outcome
- expansion of the leaf surfacee0
- Direction
- diminishede0
- Value
- 85%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the expansion of the leaf surface which was diminished by 85%”
t0“Glycine max”
e1“Low-P treatment reduced shoot growth significantly 7 days after treatment began”
Claim · model-written summary
Low phosphorus lowered light saturated photosynthesis at ambient CO2 by 55%.
- Taxon
- Glycine maxGlycine maxt0
- Treatment
- low-P treatmente0
- Outcome
- light saturated photosynthetic rates at ambiente0
- Direction
- lowerede0
- Value
- 55e0
- Qualifier
- after 19 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light saturated photosynthetic rates at ambient and saturating CO(2) levels were lowered by 55 and 45%, respectively, after 19 days of low-P treatment”
t0“Glycine max”
Claim · model-written summary
Low phosphorus lowered light saturated photosynthesis at saturating CO2 by 45%.
- Taxon
- Glycine maxGlycine maxt0
- Treatment
- low-P treatmente0
- Outcome
- light saturated photosynthetic rates at ambient and saturating CO(2) levelse0
- Direction
- lowerede0
- Value
- 45%e0
- Qualifier
- after 19 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“light saturated photosynthetic rates at ambient and saturating CO(2) levels were lowered by 55 and 45%, respectively, after 19 days of low-P treatment”
t0“Glycine max”
Claim · model-written summary
Low phosphorus increased starch in mature leaves, expanding leaves, and fibrous roots.
- Taxon
- Glycine maxGlycine maxt0
- Organ / stage
- mature leaves, expanding leaves and fibrous rootse0
- Treatment
- Low-P treatmente0
- Outcome
- starch concentrationse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low-P treatment increased starch concentrations in mature leaves, expanding leaves and fibrous roots”
t0“Glycine max”
Claim · model-written summary
Low phosphorus reduced sucrose in leaves.
- Taxon
- Glycine maxGlycine maxt0
- Organ / stage
- leavese0
- Treatment
- low-Pe0
- Outcome
- sucrose concentrationse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“sucrose concentrations, however, were reduced by low-P in leaves”
t0“Glycine max”
Claim · model-written summary
Low phosphorus increased sucrose in roots.
- Taxon
- Glycine maxGlycine maxt0
- Organ / stage
- rootse0
- Treatment
- low-Pe1
- Outcome
- sucrose concentrationse2
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased in roots”
t0“Glycine max”
e1“Low-P treatment reduced shoot growth significantly 7 days after treatment began”
e2“sucrose concentrations, however, were reduced by low-P in leaves”
Claim · model-written summary
Phosphorus treatment did not affect foliar F-2,6-BP in light.
- Taxon
- Glycine maxGlycine maxt0
- Treatment
- P treatmente0
- Outcome
- Foliar F-2,6-BP levelse0
- Direction
- not affectede0
- Qualifier
- in the lighte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Foliar F-2,6-BP levels were not affected by P treatment in the light”
t0“Glycine max”
Claim · model-written summary
In darkness, high phosphorus increased foliar F-2,6-BP.
- Taxon
- Glycine maxGlycine maxt0
- Treatment
- high-Pe0
- Outcome
- F-2,6-BP levelse1
- Direction
- increasede0
- Qualifier
- in darknesse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in darkness they increased with high-P”
t0“Glycine max”
e1“Foliar F-2,6-BP levels were not affected by P treatment in the light”
Claim · model-written summary
In darkness, low phosphorus decreased foliar F-2,6-BP.
- Taxon
- Glycine maxGlycine maxt0
- Treatment
- low-Pe0
- Outcome
- F-2,6-BP levelse1
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased with low-P”
t0“Glycine max”
e1“Foliar F-2,6-BP levels were not affected by P treatment in the light”
Claim · model-written summary
The starch to sucrose ratio in low phosphorus leaves correlated with starch and sucrose metabolism enzyme activities.
- Taxon
- Glycine maxGlycine maxt0
- Organ / stage
- leavese0
- Treatment
- low-Pe0
- Gene
- enzymes of starch and sucrose metabolisme0
- Outcome
- starch/sucrose ratioe0
- Direction
- increasee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The increase in the starch/sucrose ratio in low-P leaves was correlated primarily with changes in the total activities of enzymes of starch and sucrose metabolism”
t0“Glycine max”
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See all 146 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.