Abstract
Possible involvement of systemic regulation of the photosynthetic properties of young leaves by the local environments and/or photosynthate production of the mature leaves were examined using Phaseolus vulgaris plants. When primary leaves (PLs) were treated with air containing 150 microL CO2 L(-1) with the other plant parts in ambient air at a photosynthetic photon flux density (PPFD) of 300 micromol photon m(-2) s(-1), decreases in the photosynthetic rate measured at 360 microL CO2 L(-1) and a PPFD of 300 micromol photon m(-2) s(-1) (A360) were markedly retarded in both PLs and the first trifoliate leaves (TLs) as compared to plants treated with 400 microL CO2 L(-1). Conversely, when PLs were treated with 1000 microL CO2 L(-1), decreases in A360 were accelerated in both PLs and TLs. Shading of PLs accelerated the decrease in PL A360, and delayed the decrease in TLs. In the CO2 treatments, changes in A360 in TLs were mainly attributed to the changes in ribulose bisphosphate (RuBP) carboxylation rate, while the shading of PLs caused increases in both the RuBP carboxylation and regeneration rates in TLs. The ribulose 1.5-bisphosphate carboxylase/oxygenase (Rubisco) activity on chlorophyll basis, an indicator of sun/shade acclimation, differed both among PLs and among TLs in accordance with the redox state of photosystem II (PSII) in PLs. Although carbohydrate contents of TLs were not affected by any manipulation of PLs, changes in the photosynthetic capacities of TLs acted to compensate for changes in PL photosynthesis. These results clearly indicate that the CO2 and shade treatments of PLs not only affect photosynthetic properties of the PLs themselves, but also systemically affected the photosynthetic properties of TLs. Possible roles of the redox state and photosynthate concentration in PLs in regulation of photosynthesis in PLs and TLs are discussed.
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Claims 9
Claim · model-written summary
Low CO2 treatment of primary leaves retarded the decline in photosynthetic rate in primary and first trifoliate leaves relative to 400 microL CO2 L(-1).
- Taxon
- Phaseolus vulgaris L.
Phaseolus vulgarist0 - Organ / stage
- primary leavese0
- Treatment
- 150 microL CO2 L(-1)e0
- Outcome
- photosynthetic ratee0
- Direction
- retardede0
- Comparator
- 400 microL CO2 L(-1)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“When primary leaves (PLs) were treated with air containing 150 microL CO2 L(-1) with the other plant parts in ambient air at a photosynthetic photon flux density (PPFD) of 300 micromol photon m(-2) s(-1), decreases in the photosynthetic rate measured at 360 microL CO2 L(-1) and a PPFD of 300 micromol photon m(-2) s(-1) (A360) were markedly retarded in both PLs and the first trifoliate leaves (TLs) as compared to plants treated with 400 microL CO2 L(-1).”
t0“bean (Phaseolus vulgaris L.)”
Claim · model-written summary
High CO2 treatment of primary leaves accelerated declines in photosynthetic rate in both primary and first trifoliate leaves.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- 1000 microL CO2 L(-1)e0
- Outcome
- A360e0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“when PLs were treated with 1000 microL CO2 L(-1), decreases in A360 were accelerated in both PLs and TLs”
t0“bean (Phaseolus vulgaris L.)”
Claim · model-written summary
Shading primary leaves accelerated the decline in their photosynthetic rate.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- Shading of PLse0
- Outcome
- PL A360e0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shading of PLs accelerated the decrease in PL A360”
t0“bean (Phaseolus vulgaris L.)”
Claim · model-written summary
Shading primary leaves delayed the decline in first trifoliate leaf photosynthetic rate.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- Shading of PLse0
- Outcome
- decrease in TLse0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Shading of PLs accelerated the decrease in PL A360, and delayed the decrease in TLs”
t0“bean (Phaseolus vulgaris L.)”
Claim · model-written summary
CO2-driven changes in trifoliate leaf photosynthetic rate were mainly attributed to changes in RuBP carboxylation rate.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- CO2 treatmentse0
- Outcome
- changes in A360 in TLse0
- Qualifier
- ribulose bisphosphate (RuBP) carboxylation ratee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the CO2 treatments, changes in A360 in TLs were mainly attributed to the changes in ribulose bisphosphate (RuBP) carboxylation rate”
t0“bean (Phaseolus vulgaris L.)”
Claim · model-written summary
Shading primary leaves increased both RuBP carboxylation and regeneration rates in trifoliate leaves.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- shading of PLse0
- Outcome
- RuBP carboxylation and regeneration rates in TLse0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the shading of PLs caused increases in both the RuBP carboxylation and regeneration rates in TLs”
t0“bean (Phaseolus vulgaris L.)”
Claim · model-written summary
Rubisco activity on a chlorophyll basis differed among primary and trifoliate leaves in accordance with primary-leaf PSII redox state.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Organ / stage
- PLs and among TLse0
- Outcome
- Rubisco) activity on chlorophyll basise0
- Direction
- differede0
- Qualifier
- redox state of photosystem II (PSII) in PLse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ribulose 1.5-bisphosphate carboxylase/oxygenase (Rubisco) activity on chlorophyll basis, an indicator of sun/shade acclimation, differed both among PLs and among TLs in accordance with the redox state of photosystem II (PSII) in PLs”
t0“bean (Phaseolus vulgaris L.)”
Claim · model-written summary
Primary-leaf manipulation did not affect carbohydrate contents of trifoliate leaves.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Treatment
- manipulation of PLse0
- Outcome
- carbohydrate contents of TLse0
- Direction
- not affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“carbohydrate contents of TLs were not affected by any manipulation of PLs”
t0“bean (Phaseolus vulgaris L.)”
Claim · model-written summary
Changes in trifoliate-leaf photosynthetic capacity compensated for changes in primary-leaf photosynthesis.
- Taxon
- Phaseolus vulgaris L.Phaseolus vulgarist0
- Organ / stage
- PLe0
- Outcome
- photosynthetic capacities of TLse0
- Qualifier
- compensate for changes in PL photosynthesise0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“changes in the photosynthetic capacities of TLs acted to compensate for changes in PL photosynthesis”
t0“bean (Phaseolus vulgaris L.)”
The same questions in other papers
shade · growth · Phaseolus vulgaris (common bean)Positive and negative results
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- negative
- negative
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See all 5 papers →co2 · physiology: photosynthesis · Phaseolus vulgaris (common bean)Positive and negative results
8 papers in the same direction as this paper · 6 in the opposite direction
- no effect
- no effect
- negative
11 papers more in this group
See all 15 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.