Abstract
Chapin, F. S. Ill and Wardlaw, I. F. 1988. Effect of phosphorus deficiency on source-sink interactions between the flag leaf and developing grain in barley.—J. exp. Bot. 39: 165-177. Photosynthetic rate and stomatal conductance of P-deficient barley plants were increased by manipulations that increased plant demand for carbohydrates (shading of the ear or removal of other leaves). This was associated with retarded senescence of the flag leaf. Similarly, small flag leaves (i.e. those having large sinks relative to their own size) had high rates of photosynthesis. These relationships were most pronounced under conditions of P deficiency. Distribution of 32P and 14C from the flag leaf was determined by the carbohydrate demand of a plant part and was unaffected by altering the sink strength for P. Thus, ear shading increased accumulation by developing grains of 32P and 14C applied to the flag leaf, grain removal reduced accumulation by grain of both radioisotopes, and removal of lower leaves increased movement of both radioisotopes to vegetative plant parts; in contrast, P addition to the ear had no effect upon 32P or 14C distribution. P deficiency reduced the amount of tillering and, therefore, the movement of 32P and 14C to developing tillers and increased retention of 14C and 32P in the sheath of the flag leaf but otherwise had no major effect on patterns of carbon and phosphorus distribution. We conclude that the major effects of P deficiency upon source-sink interactions are (1) to reduce the number or activity of sinks in the shoot (grains and daughter tillers) and (2) to increase the sensitivity with which photosynthesis responds to demand for carbohydrate. The strengthened source-sink interaction under conditions of P deficiency provides a regulatory mechanism for reducing carbohydrate accumulation under conditions where carbohydrates do not strongly limit growth.
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Claims 12
Claim · model-written summary
Increasing carbohydrate demand by ear shading increased photosynthesis and stomatal conductance in P-deficient barley.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree0 - Treatment
- shading of the eare0
- Outcome
- Photosynthetic rate and stomatal conductancee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Photosynthetic rate and stomatal conductance of P-deficient barley plants were increased by manipulations that increased plant demand for carbohydrates (shading of the ear or removal of other leaves)”
Claim · model-written summary
Removing other leaves increased photosynthesis and stomatal conductance in P-deficient barley.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- removal of other leavese0
- Outcome
- Photosynthetic rate and stomatal conductancee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosynthetic rate and stomatal conductance of P-deficient barley plants were increased by manipulations that increased plant demand for carbohydrates (shading of the ear or removal of other leaves)”
Claim · model-written summary
Higher carbohydrate demand was associated with delayed flag-leaf senescence.
- Taxon
- BarleyHordeum vulgaret0
- Organ / stage
- flag leafe0
- Outcome
- senescence of the flag leafe0
- Direction
- retardede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This was associated with retarded senescence of the flag leaf”
t0“Barley”
Claim · model-written summary
Small flag leaves had high photosynthetic rates.
- Taxon
- BarleyHordeum vulgaret0
- Organ / stage
- small flag leavese0
- Outcome
- rates of photosynthesise0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“small flag leaves (i.e. those having large sinks relative to their own size) had high rates of photosynthesis”
t0“Barley”
Claim · model-written summary
Source-sink relationships were most pronounced under phosphorus deficiency.
- Taxon
- BarleyHordeum vulgaret0
- Outcome
- These relationshipse0
- Direction
- most pronouncede0
- Qualifier
- P deficiencye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These relationships were most pronounced under conditions of P deficiency”
t0“Barley”
Claim · model-written summary
Ear shading increased grain accumulation of 32P and 14C from the flag leaf.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- ear shadinge0
- Outcome
- accumulation by developing grains of 32P and 14Ce0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“ear shading increased accumulation by developing grains of 32P and 14C applied to the flag leaf”
t0“Barley”
Claim · model-written summary
Grain removal reduced grain accumulation of both radioisotopes.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- grain removale0
- Outcome
- accumulation by grain of both radioisotopese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“grain removal reduced accumulation by grain of both radioisotopes”
t0“Barley”
Claim · model-written summary
Removing lower leaves increased radioisotope movement to vegetative parts.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- removal of lower leavese0
- Outcome
- movement of both radioisotopes to vegetative plant partse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“removal of lower leaves increased movement of both radioisotopes to vegetative plant parts”
t0“Barley”
Claim · model-written summary
Adding phosphorus to the ear did not change 32P or 14C distribution.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- P addition to the eare0
- Outcome
- 32P or 14C distributione0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P addition to the ear had no effect upon 32P or 14C distribution”
t0“Barley”
Claim · model-written summary
Phosphorus deficiency reduced tillering in barley.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- P deficiencye0
- Outcome
- amount of tilleringe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P deficiency reduced the amount of tillering”
t0“Barley”
Claim · model-written summary
Phosphorus deficiency reduced radioisotope movement to developing tillers.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- P deficiencye0
- Outcome
- movement of 32P and 14C to developing tillerse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P deficiency reduced the amount of tillering and, therefore, the movement of 32P and 14C to developing tillers”
t0“Barley”
Claim · model-written summary
Phosphorus deficiency increased retention of 14C and 32P in the flag-leaf sheath.
- Taxon
- BarleyHordeum vulgaret0
- Treatment
- P deficiencye1
- Outcome
- retention of 14C and 32Pe0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased retention of 14C and 32P in the sheath of the flag leaf”
t0“Effect of Phosphorus Deficiency on Source-Sink Interactions Between the Flag Leaf and Developing Grain in Barley”
e1“These relationships were most pronounced under conditions of P deficiency”
The same questions in other papers
shade · physiology: photosynthesis · Hordeum vulgare (barley)Positive and negative results
3 in the opposite direction
- no effect
- negative
- negative
phosphorus · growth · Hordeum vulgare (barley)Positive and negative results
30 papers in the same direction as this paper · 13 in the opposite direction
This paper is about lacking the nutrient, so it counts the other way round here.
- no effect
- negative
- negative
40 papers more in this group
See all 44 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.