Abstract
The effect of 10, 25 and 50 µ M Cd(NO 3 ) 2 on the salicylic acid (SA) metabolism was investigated in young maize seedlings ( Zea mays L., hybrid Norma). Cadmium (Cd) was translocated into the leaves and induced oxidative damage, as indicated by the reduced chlorophyll content, the decreased quantum efficiency of photosystem II and the enhanced malondialdehyde (MDA) content, especially after 7 days. The activity of glutathione reductase (EC 1.6.4.2) increased from the fourth day and that of guaiacol peroxidase (EC 1.11.1.7) after 7 days of Cd stress compared with the control leaves. These effects of Cd exhibited a correlation with the concentration. Under these conditions, Cd did not affect the MDA content or the antioxidant enzyme activities in the roots. After 7 days, Cd increased the levels of free and bound forms of benzoic acid (BA), O ‐coumaric acid ( O ‐hydroxy‐cinnamic) ( O‐ HCA) and SA in the leaves, but in the roots, only the 50 µ M rate of Cd caused changes in the free O ‐HCA acid and bound BA content.
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Claims 9
Claim · model-written summary
Cadmium accumulated in maize leaves.
Zea maysNot reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cadmium (Cd) was translocated into the leaves”
t0“maize (Zea mays) plants”
Claim · model-written summary
Cadmium reduced leaf chlorophyll content and photosystem II quantum efficiency.
- Treatment
- Cadmiumt0
- Outcome
- chlorophyll content, the decreased quantum efficiency of photosystem IIe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“induced oxidative damage, as indicated by the reduced chlorophyll content, the decreased quantum efficiency of photosystem II”
t0“Cadmium stimulates the accumulation of salicylic acid and its putative precursors in maize (Zea mays) plants”
Claim · model-written summary
Cadmium increased leaf malondialdehyde content, especially after seven days.
- Treatment
- Cadmiumt0
- Outcome
- malondialdehyde (MDA) contente0
- Direction
- enhancede0
- Qualifier
- especially after 7 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the enhanced malondialdehyde (MDA) content, especially after 7 days”
t0“Cadmium stimulates the accumulation of salicylic acid and its putative precursors in maize (Zea mays) plants”
Claim · model-written summary
Leaf glutathione reductase activity increased from day four under cadmium stress.
- Treatment
- Cadmiumt0
- Gene
- glutathione reductasee0
- Outcome
- activity of glutathione reductasee0
- Direction
- increasede0
- Qualifier
- from the fourth daye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The activity of glutathione reductase (EC 1.6.4.2) increased from the fourth day”
t0“Cadmium stimulates the accumulation of salicylic acid and its putative precursors in maize (Zea mays) plants”
Claim · model-written summary
Leaf guaiacol peroxidase activity increased after seven days of cadmium stress relative to controls.
- Treatment
- Cd stresse0
- Gene
- guaiacol peroxidasee0
- Outcome
- guaiacol peroxidasee0
- Direction
- increaseinferrede0
- Qualifier
- after 7 dayse0
- Comparator
- control leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“that of guaiacol peroxidase (EC 1.11.1.7) after 7 days of Cd stress compared with the control leaves”
t0“maize (Zea mays) plants”
Claim · model-written summary
The cadmium effects correlated with cadmium concentration.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These effects of Cd exhibited a correlation with the concentration”
t0“maize (Zea mays) plants”
Claim · model-written summary
Cadmium did not affect root MDA content or antioxidant enzyme activities under these conditions.
- Organ / stage
- rootse0
- Treatment
- Cde0
- Outcome
- MDA content or the antioxidant enzyme activitiese0
- Direction
- did not affecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cd did not affect the MDA content or the antioxidant enzyme activities in the roots”
t0“maize (Zea mays) plants”
Claim · model-written summary
After seven days, cadmium increased free and bound benzoic acid, O-coumaric acid and salicylic acid in leaves.
- Organ / stage
- leavese0
- Treatment
- Cde0
- Outcome
- levels of free and bound forms of benzoic acid (BA), O ‐coumaric acid ( O ‐hydroxy‐cinnamic) ( O‐ HCA) and SAe0
- Direction
- increasede0
- Qualifier
- After 7 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After 7 days, Cd increased the levels of free and bound forms of benzoic acid (BA), O ‐coumaric acid ( O ‐hydroxy‐cinnamic) ( O‐ HCA) and SA in the leaves”
t0“maize (Zea mays) plants”
Claim · model-written summary
In roots, only 50 µ M cadmium changed free O-HCA acid and bound BA content.
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the roots, only the 50 µ M rate of Cd caused changes in the free O ‐HCA acid and bound BA content”
t0“maize (Zea mays) plants”
The same questions in other papers
cadmium atom · physiology: oxidative · Zea mays (maize)Results differ
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- negative
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See all 33 papers →cadmium atom · physiology: photosynthesis · Zea mays (maize)Positive and negative results
27 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
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See all 29 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.