Abstract
Water stress is one of the main abiotic factors that reduces plant growth, mainly due to high evaporative demand and low water availability. In order to evaluate the effects of drought stress on certain morphological and physiological characteristics of two canola cultivars, we conducted a factorial experiment based on a completely randomized design. The findings show that drought stress exacerbations result in the plant's response to stress due to increased canola resistance caused by changes in plant pigments, proline, catalase, ascorbate peroxidase, peroxidase, superoxide dismutase and malondialdehyde, glucose, galactose, rhamnose and xylose. These in turn ultimately influence the morphological characteristics of canola. Drought stress reduces the concentration of carotenoids, chlorophyll a, chlorophyll b, total chlorophylls; however, glucose, galactose, rhamnose, xylose, proline, catalase, ascorbate peroxidase, peroxidase, superoxide dismutase, malondialdehyde (in leaves and roots) and the chlorophyll a and b ratios were increased. Reduction of plant height, stem height, root length, fresh and dry weight of canola treated with 300 g/l PEG compared to non-treatment were 0.264, 0.236, 0.394, 0.183 and 0.395, respectively. From the two canola cultivars, the morphological characteristics of the NIMA increased compared to the Ks7 cultivar. Interaction effects of cultivar and drought stress showed that NIMA cultivar without treatment had the highest number of morphological characteristics such as carotenoid concentration, chlorophyll a, chlorophyll b, total chlorophylls a and b, whereas the cultivar with 300 g/l PEG (drought stress) had the highest amount of proline, malondialdehyde, soluble sugars and enzymes in leaves and roots. Increasing activity of oxidative enzymes and soluble sugars in canola under drought stress could be a sign of their relative tolerance to drought stress.
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Claims 13
Claim · model-written summary
Drought stress lowered canola carotenoid and chlorophyll concentrations.
- Taxon
- canola
.jpg?width=60)
Brassica napus var. napuse1 - Treatment
- Drought stresse0
- Outcome
- concentration of carotenoids, chlorophyll a, chlorophyll b, total chlorophyllse0
- Direction
- reducese0
Not reportedComparatorValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Drought stress reduces the concentration of carotenoids, chlorophyll a, chlorophyll b, total chlorophylls;”
e1“fresh and dry weight of canola treated with 300 g/l PEG”
Claim · model-written summary
Drought stress increased sugars and proline in canola.
Not reportedTaxonComparatorValue
Verbatim
e0“however, glucose, galactose, rhamnose, xylose, proline, catalase, ascorbate peroxidase, peroxidase, superoxide dismutase, malondialdehyde (in leaves and roots) and the chlorophyll a and b ratios were increased.”
e2“Drought stress reduces the concentration of carotenoids”
Claim · model-written summary
Drought stress increased catalase, ascorbate peroxidase, and peroxidase in canola.
Not reportedTaxonComparatorValue
Verbatim
e0“catalase, ascorbate peroxidase, peroxidase, superoxide dismutase, malondialdehyde (in leaves and roots) and the chlorophyll a and b ratios were increased.”
e2“Drought stress reduces the concentration of carotenoids”
Claim · model-written summary
Drought stress increased superoxide dismutase and malondialdehyde in canola leaves and roots.
Not reportedTaxonComparatorValue
Verbatim
e0“superoxide dismutase, malondialdehyde (in leaves and roots) and the chlorophyll a and b ratios were increased.”
e2“Drought stress reduces the concentration of carotenoids”
Claim · model-written summary
Drought stress increased the chlorophyll a and b ratios.
Not reportedTaxonComparatorValue
Verbatim
e0“the chlorophyll a and b ratios were increased.”
e2“Drought stress reduces the concentration of carotenoids”
Claim · model-written summary
At 300 g/l PEG, plant height was reduced by 0.264 versus no treatment.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- 300 g/l PEGe0
- Outcome
- plant heighte0
- Direction
- Reductione0
- Value
- 0.264e0
- Comparator
- non-treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction of plant height, stem height, root length, fresh and dry weight of canola treated with 300 g/l PEG compared to non-treatment were 0.264, 0.236, 0.394, 0.183 and 0.395, respectively.”
Claim · model-written summary
At 300 g/l PEG, stem height was reduced by 0.236 versus no treatment.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- 300 g/l PEGe0
- Outcome
- stem heighte0
- Direction
- Reductione0
- Value
- 0.236e0
- Comparator
- non-treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction of plant height, stem height, root length, fresh and dry weight of canola treated with 300 g/l PEG compared to non-treatment were 0.264, 0.236, 0.394, 0.183 and 0.395, respectively.”
Claim · model-written summary
At 300 g/l PEG, root length was reduced by 0.394 versus no treatment.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- 300 g/l PEGe0
- Outcome
- root lengthe0
- Direction
- Reductione0
- Value
- 0.394e0
- Comparator
- non-treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction of plant height, stem height, root length, fresh and dry weight of canola treated with 300 g/l PEG compared to non-treatment were 0.264, 0.236, 0.394, 0.183 and 0.395, respectively.”
Claim · model-written summary
At 300 g/l PEG, fresh weight was reduced by 0.183 versus no treatment.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- 300 g/l PEGe0
- Outcome
- freshe0
- Direction
- Reductione0
- Value
- 0.183e0
- Comparator
- non-treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction of plant height, stem height, root length, fresh and dry weight of canola treated with 300 g/l PEG compared to non-treatment were 0.264, 0.236, 0.394, 0.183 and 0.395, respectively.”
Claim · model-written summary
At 300 g/l PEG, dry weight was reduced by 0.395 versus no treatment.
- Taxon
- canolaBrassica napus var. napuse0
- Treatment
- 300 g/l PEGe0
- Outcome
- dry weighte0
- Direction
- Reductione0
- Value
- 0.395e0
- Comparator
- non-treatmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Reduction of plant height, stem height, root length, fresh and dry weight of canola treated with 300 g/l PEG compared to non-treatment were 0.264, 0.236, 0.394, 0.183 and 0.395, respectively.”
Claim · model-written summary
NIMA had greater morphological characteristics than Ks7.
- Taxon
- canolaBrassica napus var. napuse0
- Material
- NIMAe0
- Outcome
- morphological characteristicse0
- Comparator
- Ks7e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“From the two canola cultivars, the morphological characteristics of the NIMA increased compared to the Ks7 cultivar.”
Claim · model-written summary
Untreated NIMA had the highest carotenoid and chlorophyll concentrations among cultivar-stress combinations.
- Material
- NIMAe0
- Outcome
- carotenoid concentration, chlorophyll a, chlorophyll b, total chlorophylls a and be0
Not reportedTaxon
Verbatim
e0“NIMA cultivar without treatment had the highest number of morphological characteristics such as carotenoid concentration, chlorophyll a, chlorophyll b, total chlorophylls a and b”
Claim · model-written summary
The cultivar under 300 g/l PEG had the highest proline, malondialdehyde, soluble sugar, and enzyme amounts in leaves and roots.
Not reportedTaxon
Verbatim
e0“the cultivar with 300 g/l PEG (drought stress) had the highest amount of proline, malondialdehyde, soluble sugars and enzymes in leaves and roots.”
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