Abstract
To evaluate the effects of drought and salinity stresses on some germination characteristics, contents of photosynthetic pigments and antioxidant enzymes (CAT, APX and GPX) in the leaves of safflower, a factorial experiment based on CRD was conducted during 2012 at both laboratory and greenhouse of Zabol University with four replications. To expose the plants to drought (0, -6 and -8 bars) and salinity stresses (5, 10 and 15 ds.m-1) PEG 6000 and NaCl were used respectively. The results indicated that the effects of factors on germination percentage and rate, chlorophyll a and b contents and antioxidants enzymes activities were significant. The result of laboratory study revealed a reduction in percentage and speed of germination when plants exposed to negative osmotic potential. Photosynthetic pigments of plant leaves grown in greenhouse significantly decreased by increasing drought and salinity stresses. Increasing drought stress along with soluble salts changed the activity of some antioxidant enzymes. Enzymes’ activity of both CAT and GPX were increased when the plants expose to PEG drought stress, but decreased against the levels of salt stress. APX activity also increased due to drought stress. Interactive effects of drought×salinity stresses indicated that under lower stress GPX enzymes increased salinity, and under severe stress APX was highly increased. It means the production and activity of plant defensive system like these enzymes in recent tensions and leads to protect or make plants tolerate against oxidative stress induced by drought and salinity.
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Claims 6
Claim · model-written summary
Negative osmotic potential reduced germination percentage and speed of safflower.
- Taxon
- SAFFLOWER
Carthamus tinctoriust0 - Treatment
- negative osmotic potentiale1
- Outcome
- percentage and speed of germinatione1
- Direction
- reductione1
- Setting
- laboratorye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SAFFLOWER”
e1“The result of laboratory study revealed a reduction in percentage and speed of germination when plants exposed to negative osmotic potential”
Claim · model-written summary
Increasing drought and salinity stress significantly decreased photosynthetic pigments in greenhouse-grown safflower leaves.
- Taxon
- SAFFLOWERCarthamus tinctoriust0
- Organ / stage
- leavese2
- Treatment
- increasing drought and salinity stressese2
- Outcome
- Photosynthetic pigmentse2
- Direction
- decreasede2
- Setting
- greenhousee2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SAFFLOWER”
e2“Photosynthetic pigments of plant leaves grown in greenhouse significantly decreased by increasing drought and salinity stresses”
Claim · model-written summary
PEG drought stress increased the activity of both CAT and GPX enzymes in safflower leaves.
- Taxon
- SAFFLOWERCarthamus tinctoriust0
- Treatment
- PEG drought stresse3
- Outcome
- activity of both CAT and GPXe3
- Direction
- increasede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SAFFLOWER”
e3“activity of both CAT and GPX were increased when the plants expose to PEG drought stress”
Claim · model-written summary
Salt stress decreased the activity of CAT and GPX enzymes in safflower.
- Taxon
- SAFFLOWERCarthamus tinctoriust0
- Treatment
- salt stresse4
- Outcome
- activity of both CAT and GPXe3
- Direction
- decreasede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SAFFLOWER”
e3“activity of both CAT and GPX were increased when the plants expose to PEG drought stress”
e4“but decreased against the levels of salt stress”
Claim · model-written summary
Drought stress increased APX activity in safflower.
- Taxon
- SAFFLOWERCarthamus tinctoriust0
- Treatment
- drought stresse5
- Outcome
- APX activitye5
- Direction
- increasede5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SAFFLOWER”
e5“APX activity also increased due to drought stress”
Claim · model-written summary
Under severe stress APX activity was highly increased in safflower.
- Taxon
- SAFFLOWERCarthamus tinctoriust0
- Treatment
- severe stresse6
- Outcome
- APXe6
- Direction
- highly increasede6
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“SAFFLOWER”
e6“under severe stress APX was highly increased”
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