Abstract
This research was done to study the effects of lead and salicylic acid on content of photosynthetic pigments (chlorophylls a, b and a+b), and changes of soluble and insoluble sugars (starch) in roots and shoots of Brassica napus L.. One-week old seedlings of Brassica napus L. were grown in nutrient solution consisting Pb(NO3)2 (0.25, 0.5, 0.75, 1, 1.5 and 2 mmol) and salicylic acid (5 and 10 I¼mol) for 20 days. The fulfillments were in triplicate and data were statistically analyzed by using full randomize plots, SPSS and Duncan test. Based on the results by increasing the concentrations of Pb (NO3)2 in hydroponic cultures the plants could not tolerate high concentrations of lead (1.5 and 2 mmol). Other lead treated plants showed significant decrease in the amount of chlorophyll a, b and a+b and content of soluble and insoluble sugars in roots and shoot compared to control plants, in the meantime, the activities of catalase and peroxidase enzymes were significantly increased. Decreasing of the amount of chlorophyll a was higher than chlorophyll b in all treatments. There were considerable increases in chlorophyll a, soluble and insoluble sugars in both roots and shoot under lead and salicylic acid treatments. But application of salicylic acid did not show significant effect on the amount of chlorophyll b and a+b, whereas using of salicylic acid under lead treatments decreased activities of catalase and peroxidase enzymes, but salicylic acid did not have significant effect on average of catalase activities in root. On the other hand, an increase of soluble and insoluble sugars and oxidative enzymes could show the role of salicylic acid in increasing tolerance of plants under lead stress. Therefore, salicylic acid had a role in mitigation of damaged caused by oxidative stress.
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Claims 10
Claim · model-written summary
High lead concentrations were not tolerated by Brassica napus plants.
- Taxon
- Brassica napus L.
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- lead (1.5 and 2 mmol)e0
- Outcome
- could not tolerate high concentrations of leade0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“the plants could not tolerate high concentrations of lead (1.5 and 2 mmol)”
t0“Brassica napus L.”
Claim · model-written summary
Lead treatment significantly decreased chlorophyll a, b and a+b.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- leade0
- Outcome
- chlorophyll a, b and a+be0
- Direction
- decreasee0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Other lead treated plants showed significant decrease in the amount of chlorophyll a, b and a+b and content of soluble and insoluble sugars in roots and shoot compared to control plants”
t0“Brassica napus L.”
Claim · model-written summary
Lead treatment significantly decreased soluble and insoluble sugars in roots and shoots.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- leade0
- Outcome
- soluble and insoluble sugars in roots and shoote0
- Direction
- decreasee0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Other lead treated plants showed significant decrease in the amount of chlorophyll a, b and a+b and content of soluble and insoluble sugars in roots and shoot compared to control plants”
t0“Brassica napus L.”
Claim · model-written summary
Lead treatment significantly increased catalase and peroxidase activities.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- leadt0
- Outcome
- activities of catalase and peroxidase enzymese0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the activities of catalase and peroxidase enzymes were significantly increased”
t0“lead stress in Brassica napus L.”
Claim · model-written summary
Chlorophyll a declined more than chlorophyll b in all treatments.
- Taxon
- Brassica napus L.Brassica napust0
- Outcome
- amount of chlorophyll ae0
- Direction
- Decreasinge0
- Comparator
- chlorophyll be0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreasing of the amount of chlorophyll a was higher than chlorophyll b in all treatments”
t0“Brassica napus L.”
Claim · model-written summary
Salicylic acid with lead increased chlorophyll a.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- lead and salicylic acid treatmentse0
- Outcome
- chlorophyll ae0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were considerable increases in chlorophyll a, soluble and insoluble sugars in both roots and shoot under lead and salicylic acid treatments”
t0“Brassica napus L.”
Claim · model-written summary
Salicylic acid with lead increased soluble and insoluble sugars in roots and shoots.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- lead and salicylic acid treatmentse0
- Outcome
- soluble and insoluble sugars in both roots and shoote0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There were considerable increases in chlorophyll a, soluble and insoluble sugars in both roots and shoot under lead and salicylic acid treatments”
t0“Brassica napus L.”
Claim · model-written summary
Salicylic acid had no significant effect on chlorophyll b and a+b.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- salicylic acide0
- Outcome
- amount of chlorophyll b and a+be0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“application of salicylic acid did not show significant effect on the amount of chlorophyll b and a+b”
t0“Brassica napus L.”
Claim · model-written summary
Salicylic acid under lead decreased catalase and peroxidase activities.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- salicylic acid under lead treatmentse0
- Outcome
- activities of catalase and peroxidase enzymese0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“using of salicylic acid under lead treatments decreased activities of catalase and peroxidase enzymes”
t0“Brassica napus L.”
Claim · model-written summary
Salicylic acid had no significant effect on average root catalase activity.
- Taxon
- Brassica napus L.Brassica napust0
- Treatment
- salicylic acide0
- Outcome
- average of catalase activities in roote0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salicylic acid did not have significant effect on average of catalase activities in root”
t0“Brassica napus L.”
The same questions in other papers
salicylic acid · physiology: pigments · Brassica napus (oilseed rape)Results differ
5 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
3 papers more in this group
See all 7 papers →salicylic acid · physiology: antioxidant enzymes · Brassica napus (oilseed rape)Results differ
7 papers in the same direction as this paper
- positive
- positive
- positive
4 papers more in this group
See all 8 papers →lead atom · physiology: pigments · Brassica napus (oilseed rape)Positive and negative results
1 in the opposite direction
- negative
lead atom · nutrient: content · Brassica napus (oilseed rape)Results agree
2 papers in the same direction as this paper
- negative
- no effect
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.