Abstract
Fourteen genotypes of barley were compared for response to salinity by monitoring the parameters gas exchange and chlorophyll fluorescence. We present relationships between stomatal conductance (gs) gas exchange chlorophyll fluorescence parameters and aboveground dry matter (AGDM). We found that genetic variability provided a continuum of data for gs across control and saline conditions. We used this continuum of gs values to test the overall relationships between gs and net photosynthesis (A), leaf internal CO2 concentration (Ci), actual quantum yield of PSII electron transport (PhiPSII), relative electron yield over net CO2 assimilation rate (ETR/A), and AGDM. The relationship between gs and A was highly significant (P < 0.0001) for both control and saline treatments, while correlations between gs and Ci, and Ci and A were significant only under control conditions. Unexpectedly, we found positive correlations between gs and PhiPSII (P < 0.0001) for both conditions. A comparison between relationships of gs and A, and gs and PhiPSII seemed to indicate a possible acclimation to salinity at the chloroplastic level. Finally, the relationships between gs and ETR/A were exceptionally strong for both growing conditions (P < 0.0001) indicating that, as gs values were negatively affected in barley by genetics and salinity as main or interactive effects, there was a progressive increase in photorespiration in barley. Overall, we found that stomatal conductance was a key parameter in the study of barley responses to limiting situations for photosynthesis. We also found a strong relationship between AGDM and gs regardless of growing conditions and genotypes. For breeding evaluations to select barley genotypes for salinity tolerance, it may be possible to replace all measurements of gas exchange and chlorophyll fluorescence by the simple use of a porometer.
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Claims 8
Claim · model-written summary
Stomatal conductance and net photosynthesis (A) were highly significantly related under both control and saline treatments in barley.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaree1 - Treatment
- saline treatmentse2
- Outcome
- gs and Ae2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e1“Fourteen genotypes of barley were compared for response to salinity”
e2“The relationship between gs and A was highly significant (P < 0.0001) for both control and saline treatments”
Claim · model-written summary
Stomatal conductance and intercellular CO2 concentration (Ci) were significantly correlated only under control conditions in barley.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- control conditionse3
- Outcome
- gs and Cie3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Fourteen genotypes of barley were compared for response to salinity”
e3“correlations between gs and Ci, and Ci and A were significant only under control conditions”
Claim · model-written summary
Stomatal conductance and PhiPSII were positively correlated under both conditions in barley.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- both conditionse4
- Outcome
- gs and PhiPSIIe4
- Direction
- positivee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Fourteen genotypes of barley were compared for response to salinity”
e4“we found positive correlations between gs and PhiPSII (P < 0.0001) for both conditions”
Claim · model-written summary
The relationship between stomatal conductance and ETR/A was exceptionally strong under both growing conditions in barley.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- both growing conditionse5
- Outcome
- gs and ETR/Ae5
- Direction
- exceptionally stronge5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Fourteen genotypes of barley were compared for response to salinity”
e5“the relationships between gs and ETR/A were exceptionally strong for both growing conditions (P < 0.0001)”
Claim · model-written summary
Aboveground dry matter (AGDM) had a strong relationship with stomatal conductance regardless of growing conditions and genotypes in barley.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- growing conditionse6
- Outcome
- AGDMe6
- Direction
- stronge6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Fourteen genotypes of barley were compared for response to salinity”
e6“We also found a strong relationship between AGDM and gs regardless of growing conditions and genotypes”
Claim · model-written summary
Salinity, together with genetics, negatively affected stomatal conductance in barley.
- Taxon
- barleyHordeum vulgaree1
- Treatment
- salinitye2
- Outcome
- gs valuese2
- Direction
- negatively affectede2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Fourteen genotypes of barley were compared for response to salinity”
e2“as gs values were negatively affected in barley by genetics and salinity as main or interactive effects”
Claim · model-written summary
Photorespiration increased progressively in barley.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- photorespiratione2
- Direction
- progressive increasee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Fourteen genotypes of barley were compared for response to salinity”
e2“there was a progressive increase in photorespiration in barley”
Claim · model-written summary
Replacing gas exchange and chlorophyll fluorescence measurements by a porometer may be possible for selecting barley genotypes for salinity tolerance.
- Taxon
- barleyHordeum vulgaree1
- Outcome
- gas exchange and chlorophyll fluorescencee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Fourteen genotypes of barley were compared for response to salinity”
e7“For breeding evaluations to select barley genotypes for salinity tolerance, it may be possible to replace all measurements of gas exchange and chlorophyll fluorescence by the simple use of a porometer”
The same questions in other papers
salinity · physiology: gas exchange · Hordeum vulgare (barley)Results agree
5 papers in the same direction as this paper
- negative
- negative
- negative
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.