Abstract
Remobilization of mineral nutrients from leaves to reproductive structures is a possible regulatory factor in leaf senescence. The relationship between P remobilization from leaves of soybean (Glycine max [L.] Merr. cv McCall) during reproductive development and leaf senescence was determined by utilizing soil P treatments that supplied deficient, optimum, and supraoptimum soil P levels. The soil P treatments simulated field conditions, being initiated at the time of planting with no subsequent addition or removal of P. It was hypothesized that P deficiency would accelerate leaf senescence and that supraoptimum P nutrition would delay the timing or rate of leaf senescence relative to plants grown with optimum P. Supraoptimum soil P led to a two- to fourfold increase in leaf P concentration compared with optimum P, and during senescence there was no net P remobilization from leaves for this treatment. Leaf P concentration was similar for plants grown at optimum or deficient soil P, and there was significant net P remobilization from leaves of both treatments in one of the two experiments. As indicated by changes in leaf N, carbon dioxide exchange rate, ribulose 1,5-bisphosphate carboxylase/oxygenase activity, and chlorophyll concentration, leaf senescence patterns were similar for all soil P treatments. Thus, it can be concluded that leaf senescence was not affected by either P deficiency or enhanced leaf P concentration resulting from supraoptimum soil P. The results suggest that P nutrition in general, and specifically P remobilization from leaves, does not exert any regulatory control on the process of leaf senescence.
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Claims 6
Claim · model-written summary
Supraoptimum soil P raised soybean leaf P concentration two- to fourfold versus optimum P.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- Supraoptimum soil Pe0
- Outcome
- leaf P concentratione0
- Direction
- increasee0
- Value
- two- to fourfolde0
- Comparator
- optimum Pe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Supraoptimum soil P led to a two- to fourfold increase in leaf P concentration compared with optimum P”
t0“Soybean”
Claim · model-written summary
Soybean leaves showed no net P remobilization during senescence under supraoptimum soil P.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- no net P remobilization from leavese0
- Qualifier
- during senescencee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“during senescence there was no net P remobilization from leaves for this treatment”
t0“Soybean”
Claim · model-written summary
Soybean leaf P concentration was similar under optimum and deficient soil P.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- deficient soil Pe0
- Outcome
- Leaf P concentratione0
- Direction
- similare0
- Comparator
- optimume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Leaf P concentration was similar for plants grown at optimum or deficient soil P”
t0“Soybean”
Claim · model-written summary
Net P remobilization occurred in soybean leaves under optimum and deficient soil P in one of two experiments.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- net P remobilization from leavese0
- Qualifier
- in one of the two experimentse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was significant net P remobilization from leaves of both treatments in one of the two experiments”
t0“Soybean”
Claim · model-written summary
Soybean leaf senescence patterns were similar across soil P treatments.
- Taxon
- SoybeanGlycine maxt0
- Treatment
- soil P treatmentse0
- Outcome
- leaf senescence patternse0
- Direction
- similare0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“leaf senescence patterns were similar for all soil P treatments”
t0“Soybean”
Claim · model-written summary
The authors concluded P nutrition and remobilization did not regulate soybean leaf senescence.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- leaf senescencee0
- Qualifier
- P remobilization from leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“P remobilization from leaves, does not exert any regulatory control on the process of leaf senescence”
t0“Soybean”
The same questions in other papers
phosphorus · quality: postharvest · Glycine max (soybean)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
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.