Abstract
Little is known about the photosynthetic physiology of guar (Cyamopsis tetragonoloba L. Taub), a legume crop, including how photosynthetic parameters intrinsically vary among germplasm and their recovery from water stress. To address this, two greenhouse studies were conducted: Study-1 to compare photosynthetic light response (AN–I) curves and related parameters in three contrasting guar genotypes under optimal and post-water deficit conditions; and Study-2 to quantify photosynthetic parameters in 44 guar genotypes and explore inter-relationships with plant growth parameters. In Study-1, the mean net photosynthetic rate (AN) statistically peaked with 1500 μmol (photons) m −2 s −1, though the maximum AN [33.29 μmol (CO2) m−2 s−1] was modeled to occur with 1950 μmol (photons) m −2 s −1. The light compensation point (Icomp), dark respiration rate (RD), and maximum quantum yield (Ф(I0)) were modeled to be 49.9 μmol (photons) m−2 s−1, 2.62 μmol (CO2) m−2 s−1, and 0.0526 μmol (CO2) μmol−1 (photons), respectively. Photosynthesis in guar was resilient to water stress. Despite reductions in growth, specific leaf area (SLA), and other growth parameters, persistently drought-stressed guar plants, on average, exhibited rapid and full recovery of photosynthetic functions when watered. Genotypes differed in their capacity to recover to some degree. In Study-2, AN differed only between two of the 44 genotypes tested, corresponding to the minimum and maximum AN values. There were no relationships between AN and most plant growth parameters. This finding suggested there is low potential to use point measurements of AN as a selection parameter for increased guar productivity.
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Claims 11
Claim · model-written summary
Mean net photosynthetic rate peaked statistically at 1500 μmol photons m−2 s−1.
- Taxon
- guar
Cyamopsis tetragonolobat0 - Outcome
- net photosynthetic ratee0
- Direction
- peakede0
- Value
- 1500 μmol (photons) m −2 s −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“guar”
e0“the mean net photosynthetic rate (AN) statistically peaked with 1500 μmol (photons) m −2 s −1”
Claim · model-written summary
Modeled maximum net photosynthetic rate was 33.29 μmol CO2 m−2 s−1 at 1950 μmol photons m−2 s−1.
- Taxon
- guarCyamopsis tetragonolobat0
- Outcome
- maximum ANe0
- Direction
- maximume0
- Value
- 33.29 μmol (CO2) m−2 s−1e0
- Qualifier
- 1950 μmol (photons) m −2 s −1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“guar”
e0“maximum AN [33.29 μmol (CO2) m−2 s−1] was modeled to occur with 1950 μmol (photons) m −2 s −1”
Claim · model-written summary
Modeled light compensation point was 49.9 μmol photons m−2 s−1.
- Taxon
- guarCyamopsis tetragonolobat0
- Outcome
- light compensation pointe0
- Value
- 49.9 μmol (photons) m−2 s−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“guar”
e0“The light compensation point (Icomp), dark respiration rate (RD), and maximum quantum yield (Ф(I0)) were modeled to be 49.9 μmol (photons) m−2 s−1, 2.62 μmol (CO2) m−2 s−1, and 0.0526 μmol (CO2) μmol−1 (photons), respectively.”
Claim · model-written summary
Modeled dark respiration rate was 2.62 μmol CO2 m−2 s−1.
- Taxon
- guarCyamopsis tetragonolobat0
- Outcome
- dark respiration ratee0
- Value
- 2.62 μmol (CO2) m−2 s−1e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“guar”
e0“The light compensation point (Icomp), dark respiration rate (RD), and maximum quantum yield (Ф(I0)) were modeled to be 49.9 μmol (photons) m−2 s−1, 2.62 μmol (CO2) m−2 s−1, and 0.0526 μmol (CO2) μmol−1 (photons), respectively.”
Claim · model-written summary
Modeled maximum quantum yield was 0.0526 μmol CO2 μmol−1 photons.
- Taxon
- guarCyamopsis tetragonolobat0
- Outcome
- maximum quantum yielde0
- Value
- 0.0526 μmol (CO2) μmol−1 (photons)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“guar”
e0“The light compensation point (Icomp), dark respiration rate (RD), and maximum quantum yield (Ф(I0)) were modeled to be 49.9 μmol (photons) m−2 s−1, 2.62 μmol (CO2) m−2 s−1, and 0.0526 μmol (CO2) μmol−1 (photons), respectively.”
Claim · model-written summary
Persistent drought stress reduced guar growth and specific leaf area.
- Taxon
- guarCyamopsis tetragonolobat0
- Treatment
- persistently drought-stressede0
- Outcome
- growth, specific leaf area (SLA), and other growth parameterse0
- Direction
- reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“guar”
e0“Despite reductions in growth, specific leaf area (SLA), and other growth parameters, persistently drought-stressed guar plants”
Claim · model-written summary
Persistently drought-stressed guar fully and rapidly recovered photosynthetic functions after watering.
- Taxon
- guarCyamopsis tetragonolobae0
- Treatment
- when waterede0
- Outcome
- photosynthetic functionse0
- Direction
- recoverye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“persistently drought-stressed guar plants, on average, exhibited rapid and full recovery of photosynthetic functions when watered”
Claim · model-written summary
Guar genotypes differed somewhat in recovery capacity.
- Taxon
- guarCyamopsis tetragonolobat0
- Material
- Genotypese0
- Outcome
- capacity to recovere0
- Direction
- differede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“guar”
e0“Genotypes differed in their capacity to recover to some degree.”
Claim · model-written summary
Net photosynthetic rate differed only between the minimum and maximum genotypes among 44 tested.
- Taxon
- guarCyamopsis tetragonolobat0
- Material
- 44 genotypese0
- Outcome
- ANe0
- Direction
- differede0
- Qualifier
- only between twoe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“guar”
e0“AN differed only between two of the 44 genotypes tested, corresponding to the minimum and maximum AN values.”
Claim · model-written summary
Net photosynthetic rate was unrelated to most plant growth parameters.
- Taxon
- guarCyamopsis tetragonolobat0
- Outcome
- ANe0
- Qualifier
- most plant growth parameterse0
- Comparator
- plant growth parameterse0
Not reportedMaterialOrgan / stageDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“guar”
e0“There were no relationships between AN and most plant growth parameters.”
Claim · model-written summary
The authors inferred that point measurements of net photosynthetic rate have low potential for selecting more productive guar.
- Taxon
- guarCyamopsis tetragonolobat0
- Outcome
- use point measurements of AN as a selection parameter for increased guar productivitye0
- Direction
- low potentiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“guar”
e0“low potential to use point measurements of AN as a selection parameter for increased guar productivity”
The same questions in other papers
drought · growth · Cyamopsis tetragonoloba (cluster bean)Positive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction
- negative
- positive
- positive
2 papers more in this group
See all 6 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.