Abstract
Abstract Climate change, food insecurity, water scarcity, and population growth are some of today's world's frightening problems. Drought stress exerts a constant threat to field crops and is often seen as a major constraint on global agricultural productivity; its intensity and frequency are expected to increase in the near future. The present study investigated the effects of drought stress (15% w/v polyethylene glycol PEG‐6000) on physiological and biochemical changes in five Brassica napus cultivars (ZD630, ZD622, ZD619, GY605, and ZS11). For drought stress induction, 3‐week‐old rapeseed oil seedlings were treated with PEG‐6000 in full strength Hoagland nutrient solution for 7 days. PEG treatment significantly decreased the plant growth and photosynthetic efficiency, including primary photochemistry (Fv/Fm) of PSII, intercellular CO 2 , net photosynthesis, chlorophyll contents, and water‐use efficiency of all studied B. napus cultivars; however, pronounced growth retardations were observed in cultivar GY605. Drought‐stressed B. napus cultivars also experienced a sharp rise in H 2 O 2 generation and malondialdehyde (MDA) content. Additionally, the accumulation of ROS was accompanied by increased activity of enzymatic antioxidants (superoxide dismutase, peroxidase, catalase, ascorbate peroxidase, glutathione reductase, and monodehydroascorbate reductase), although the increase was more obvious in ZD622 and ZS11. Drought stress also caused an increased endogenous hormonal biosynthesis (abscisic acid, jasmonic acid, salicylic acid) and accumulation of total soluble proteins and proline content, but the extent varies in B. napus cultivars. These results suggest that B. napus cultivars have an efficient drought stress tolerance mechanism, as shown by improved antioxidant enzyme activities, photosynthetic and hormonal regulation.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
PEG drought decreased plant growth, especially in GY605.
- Taxon
- Brassica napus
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napuse2 - Material
- GY605e1
- Treatment
- PEG treatmente0
- Outcome
- plant growthe0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“PEG treatment significantly decreased the plant growth”
e1“pronounced growth retardations were observed in cultivar GY605”
e2“five Brassica napus cultivars”
Claim · model-written summary
PEG drought decreased photosynthetic efficiency and related photosynthetic measures.
- Taxon
- B. napusBrassica napuse0
- Treatment
- PEG treatmente0
- Outcome
- photosynthetic efficiencye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“PEG treatment significantly decreased the plant growth and photosynthetic efficiency, including primary photochemistry (Fv/Fm) of PSII, intercellular CO 2 , net photosynthesis, chlorophyll contents, and water‐use efficiency of all studied B. napus cultivars”
Claim · model-written summary
Drought raised H 2 O 2 generation and MDA content.
- Taxon
- B. napusBrassica napuse0
- Treatment
- Drought‐stressede0
- Outcome
- H 2 O 2 generation and malondialdehyde (MDA) contente0
- Direction
- sharp risee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought‐stressed B. napus cultivars also experienced a sharp rise in H 2 O 2 generation and malondialdehyde (MDA) content”
Claim · model-written summary
Drought increased antioxidant enzyme activity, especially in ZD622 and ZS11.
- Taxon
- B. napusBrassica napuse1
- Treatment
- Drought‐stressede1
- Outcome
- activity of enzymatic antioxidantse0
- Direction
- increasede0
- Qualifier
- more obvious in ZD622 and ZS11e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased activity of enzymatic antioxidants (superoxide dismutase, peroxidase, catalase, ascorbate peroxidase, glutathione reductase, and monodehydroascorbate reductase), although the increase was more obvious in ZD622 and ZS11”
e1“Drought‐stressed B. napus cultivars”
Claim · model-written summary
Drought increased endogenous hormone biosynthesis.
- Taxon
- B. napusBrassica napuse1
- Treatment
- Drought stresse0
- Outcome
- endogenous hormonal biosynthesise0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress also caused an increased endogenous hormonal biosynthesis (abscisic acid, jasmonic acid, salicylic acid)”
e1“extent varies in B. napus cultivars”
Claim · model-written summary
Drought increased total soluble protein and proline content with cultivar variation.
- Taxon
- B. napusBrassica napuse0
- Treatment
- Drought stresse1
- Outcome
- total soluble proteins and proline contente0
- Direction
- accumulatione0
- Qualifier
- the extent variese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“accumulation of total soluble proteins and proline content, but the extent varies in B. napus cultivars”
e1“Drought stress also caused an increased endogenous hormonal biosynthesis”
The same questions in other papers
drought · physiology: osmolytes · Brassica napus (oilseed rape)Results differ
7 papers in the same direction as this paper · 7 in the opposite direction
- negative
- negative
- negative
11 papers more in this group
See all 15 papers →drought · growth · Brassica napus (oilseed rape)Results differ
51 papers in the same direction as this paper · 11 in the opposite direction
- negative
- negative
- positive
59 papers more in this group
See all 63 papers →drought · molecular: metabolites · Brassica napus (oilseed rape)Positive and negative results
4 papers in the same direction as this paper · 9 in the opposite direction
- negative
- negative
- negative
10 papers more in this group
See all 14 papers →drought · physiology: photosynthesis · Brassica napus (oilseed rape)Positive and negative results
17 papers in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
16 papers more in this group
See all 20 papers →drought · physiology: oxidative · Brassica napus (oilseed rape)Positive and negative results
21 papers in the same direction as this paper · 5 in the opposite direction
- positive
- positive
- positive
23 papers more in this group
See all 27 papers →drought · physiology: enzyme activity · Brassica napus (oilseed rape)Results agree
1 paper in the same direction as this paper
- positive
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.