Abstract
Chlorophyll a fluorescence measurements were carried out on two barley (Hordeum vulgare L.) cultivars Arabi Abiad and Arabi Aswad at 8 and 14 days after emergence to identify their early tolerance mechanism for heavy metals (25 and 50μM of cadmium and lead). Transient fluorescence curves (OJIP curves) and energy flux models showed different specific reactions of photosystem II (PSII) of each cultivar to each type of stress. After 7 days of lead stress application plants of cv. A. Aswad showed weaker I and P peaks on the OJIP curve than control plants, and the appearance of a new K step; parameters of phenomenological energy fluxes for cv. A. Abiad were similar to those for control plants and only some silent reaction centers appeared. Generally, parameters of energy fluxes within PSII were directly shifted shortly (24 h) after the application of both heavy metals, especially in the case of plants grown under cadmium treatment. This suggests that these parameters could be good indicators for monitoring of these two pollutants in the environment at early stages of plant development.
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Claims 6
Claim · model-written summary
Chlorophyll fluorescence curves and energy flux models showed that each barley cultivar reacted differently in photosystem II to each heavy metal stress.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- cadmium and leade0
- Outcome
- specific reactions of photosystem II (PSII)e1
- Direction
- differente1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
t0“barley seedlings”
e0“cadmium and lead”
e1“showed different specific reactions of photosystem II (PSII) of each cultivar to each type of stress”
Claim · model-written summary
After 7 days of lead stress, cv. A. Aswad showed weaker I and P peaks on the OJIP curve than control plants.
- Taxon
- barleyHordeum vulgaret0
- Material
- cv. A. Aswade1
- Treatment
- lead stress applicatione0
- Outcome
- I and P peaks on the OJIP curvee1
- Direction
- weakere1
- Comparator
- control plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley seedlings”
e0“After 7 days of lead stress application”
e1“plants of cv. A. Aswad showed weaker I and P peaks on the OJIP curve than control plants”
Claim · model-written summary
A new K step appeared on the OJIP curve of cv. A. Aswad after 7 days of lead stress.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- lead stress applicatione0
- Outcome
- appearance of a new K stepe1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley seedlings”
e0“After 7 days of lead stress application”
e1“the appearance of a new K step”
Claim · model-written summary
In cv. A. Abiad, energy flux parameters after lead stress were similar to those of control plants and only some silent reaction centers appeared.
- Taxon
- barleyHordeum vulgaret0
- Material
- cv. A. Abiade1
- Treatment
- lead stress applicatione0
- Outcome
- parameters of phenomenological energy fluxese1
- Direction
- similare1
- Comparator
- control plantse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley seedlings”
e0“After 7 days of lead stress application”
e1“parameters of phenomenological energy fluxes for cv. A. Abiad were similar to those for control plants and only some silent reaction centers appeared”
Claim · model-written summary
Energy flux parameters within PSII shifted within 24 h after applying both heavy metals, especially under cadmium.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- both heavy metalse0
- Outcome
- parameters of energy fluxes within PSIIe0
- Direction
- shiftede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley seedlings”
e0“Generally, parameters of energy fluxes within PSII were directly shifted shortly (24 h) after the application of both heavy metals, especially in the case of plants grown under cadmium treatment”
Claim · model-written summary
The authors suggest the PSII energy flux parameters could be good indicators for monitoring cadmium and lead pollution at early plant stages.
- Taxon
- barleyHordeum vulgaret0
- Outcome
- good indicators for monitoring of these two pollutantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“barley seedlings”
e0“these parameters could be good indicators for monitoring of these two pollutants in the environment at early stages of plant development”
The same questions in other papers
heavy metal · physiology: photosynthesis · Hordeum vulgare (barley)Results agree
4 papers in the same direction as this paper
- negative
- negative
- negative
1 paper more in this group
See all 5 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.