Abstract
Responses of leaf senescence to P supply could constitute adaptive mechanisms for plant growth under P-limiting conditions. The aim of this study was to evaluate the effects of soil P supply on leaf senescence of common bean (Phaseolus vulgaris L.). Eight P levels, ranging from 5 to 640 mg kg-1 P, were applied to pots containing four bean plants of cultivar Carioca in 10 kg of an Oxic Haplustult soil. Attached leaves were counted weekly, abscised leaves were collected every other day, and seeds were harvested at maturity. The number of live leaves increased until 48 days after emergence (DAE) and decreased afterwards, irrespective of applied P levels. At lower applied P levels, the initial increase and the final decrease of leaf number was weak, whereas at higher applied P levels the leaf number increased intensively at the beginning of the growth cycle and decreased strongly after 48 DAE. Dry matter and P accumulated in senesced leaves increased as soil P levels increased until 61 DAE, but differences between P treatments narrowed thereafter. The greatest amounts of dry mass and P deposited by senesced leaves were observed at 48-54 DAE for high P levels, at 62-68 DAE for intermediate P levels and at 69-76 DAE for low P levels. These results indicate that soil P supply did not affect the stage of maximal leaf number and the beginning of leaf senescence of common bean plants, but the stage of greatest deposition of senesced leaves occurred earlier in the growth cycle as the soil P supply was raised.
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Claims 10
Claim · model-written summary
Live leaf number rose until 48 DAE and then declined at all P levels.
Not reportedTaxonDirection
Verbatim
e0“The number of live leaves increased until 48 days after emergence (DAE) and decreased afterwards, irrespective of applied P levels”
Claim · model-written summary
At low P, the early rise and later fall in leaf number were weak.
Not reportedTaxon
Verbatim
e0“At lower applied P levels, the initial increase and the final decrease of leaf number was weak”
Claim · model-written summary
At high P, leaf number rose intensely early and fell strongly after 48 DAE.
Not reportedTaxonDirection
Verbatim
e0“at higher applied P levels the leaf number increased intensively at the beginning of the growth cycle and decreased strongly after 48 DAE”
Claim · model-written summary
Senesced-leaf dry matter increased with soil P until 61 DAE, then treatment differences narrowed.
Not reportedTaxon
Verbatim
e0“Dry matter and P accumulated in senesced leaves increased as soil P levels increased until 61 DAE, but differences between P treatments narrowed thereafter”
Claim · model-written summary
Senesced-leaf P accumulation increased with soil P until 61 DAE, then differences narrowed.
Not reportedTaxon
Verbatim
e0“Dry matter and P accumulated in senesced leaves increased as soil P levels increased until 61 DAE, but differences between P treatments narrowed thereafter”
Claim · model-written summary
Greatest senesced-leaf dry mass and P deposition occurred at 48-54 DAE under high P.
- Outcome
- dry mass and P deposited by senesced leavese0
- Direction
- greateste0
- Qualifier
- 48-54 DAE for high P levelse0
Not reportedTaxon
Verbatim
e0“The greatest amounts of dry mass and P deposited by senesced leaves were observed at 48-54 DAE for high P levels”
Claim · model-written summary
Greatest deposition occurred at 62-68 DAE under intermediate P.
Not reportedTaxon
Verbatim
e0“at 62-68 DAE for intermediate P levels”
Claim · model-written summary
Greatest deposition occurred at 69-76 DAE under low P.
Not reportedTaxon
Verbatim
e0“at 69-76 DAE for low P levels”
Claim · model-written summary
P supply did not shift the stage of maximum leaf number or senescence onset.
- Taxon
- common bean plants
Phaseolus vulgarise0 - Treatment
- soil P supplye0
- Outcome
- stage of maximal leaf number and the beginning of leaf senescencee0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“soil P supply did not affect the stage of maximal leaf number and the beginning of leaf senescence of common bean plants”
Claim · model-written summary
Higher soil P shifted greatest senesced-leaf deposition earlier.
Not reportedTaxon
Verbatim
e0“the stage of greatest deposition of senesced leaves occurred earlier in the growth cycle as the soil P supply was raised”
The same questions in other papers
phosphorus · quality: postharvest · Phaseolus vulgaris (common bean)Positive and negative results
2 in the opposite direction
- 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.