Abstract
The changes caused by NaCl− and CaCl 2 ‐induced salinity on several leaf parameters have been measured in two cultivars of barley ( Hordeum vulgare L.) growing in a growth chamber in nutrient solution. Salinity was induced by adding to the nutrient solution equal weights of NaCl and CaCl 2 , to obtain conductivities of 2, 6, 12, 19 and 26 dS m −1 . Salinity induced decreases in the leaf water potential and in the osmotic potential. Salinity did not induce significant changes in the relative photosynthetic pigment composition of barley leaves, the photosynthetic pigment stoichiometry for neoxanthin:violaxanthin cycle pigments:lutein:β‐carotene:Chl b :Chl a being close to 3:6:14:12:25:100 (mol:mol). Salinity per se did not induce interconversions in the carotenoids within the violaxanthin cycle in most barley leaves. The PSII photochemistry of most barley leaves was unchanged by salinity. However, some apparently healthy leaves growing in high salinity exhibited sudden decreases in PSII photochemistry and increases in zeaxanthin (at the expense of violaxanthin), that preceded rapid leaf drying. Salinity induced significant changes in the slow part of the chlorophyll fluorescence induction curve from barley leaves.
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Claims 8
Claim · model-written summary
Salinity decreased barley leaf water and osmotic potentials.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- Salinitye0
- Outcome
- leaf water potential and in the osmotic potentiale0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Salinity induced decreases in the leaf water potential and in the osmotic potential.”
t0“barley”
Claim · model-written summary
Salinity did not significantly change relative photosynthetic pigment composition.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- Salinitye0
- Outcome
- relative photosynthetic pigment compositione0
- Direction
- did not induce significant changese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity did not induce significant changes in the relative photosynthetic pigment composition of barley leaves”
Claim · model-written summary
The pigment stoichiometry was near 3:6:14:12:25:100.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- photosynthetic pigment stoichiometrye0
- Value
- 3:6:14:12:25:100 (mol:mol)e0
- Qualifier
- neoxanthin:violaxanthin cycle pigments:lutein:β‐carotene:Chl b :Chl ae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the photosynthetic pigment stoichiometry for neoxanthin:violaxanthin cycle pigments:lutein:β‐carotene:Chl b :Chl a being close to 3:6:14:12:25:100 (mol:mol)”
t0“barley”
Claim · model-written summary
Salinity did not cause violaxanthin-cycle carotenoid interconversion in most leaves.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- Salinitye0
- Outcome
- interconversions in the carotenoids within the violaxanthin cyclee0
- Direction
- did not inducee0
- Qualifier
- most barley leavese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity per se did not induce interconversions in the carotenoids within the violaxanthin cycle in most barley leaves.”
Claim · model-written summary
PSII photochemistry in most leaves was unchanged under salinity.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- salinitye0
- Outcome
- PSII photochemistrye0
- Direction
- unchangede0
- Qualifier
- most barley leavese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The PSII photochemistry of most barley leaves was unchanged by salinity.”
Claim · model-written summary
Some apparently healthy leaves under high salinity showed sudden decreases in PSII photochemistry before rapid drying.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- high salinitye0
- Outcome
- PSII photochemistrye0
- Direction
- decreasese0
- Qualifier
- some apparently healthy leavese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“some apparently healthy leaves growing in high salinity exhibited sudden decreases in PSII photochemistry and increases in zeaxanthin (at the expense of violaxanthin), that preceded rapid leaf drying”
t0“barley”
Claim · model-written summary
Some apparently healthy high-salinity leaves showed increased zeaxanthin at the expense of violaxanthin before drying.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- high salinitye0
- Outcome
- zeaxanthine0
- Direction
- increasese0
- Qualifier
- at the expense of violaxanthine0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“some apparently healthy leaves growing in high salinity exhibited sudden decreases in PSII photochemistry and increases in zeaxanthin (at the expense of violaxanthin), that preceded rapid leaf drying”
t0“barley”
Claim · model-written summary
Salinity significantly changed the slow part of barley chlorophyll fluorescence induction.
- Taxon
- barleyHordeum vulgaree0
- Treatment
- Salinitye0
- Outcome
- slow part of the chlorophyll fluorescence induction curvee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity induced significant changes in the slow part of the chlorophyll fluorescence induction curve from barley leaves.”
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