Abstract
This study was carried out to determine the effect of different zinc concentrations on the ecophysiological response of Salix clones: four commercial clones ("1962", "1968", "Drago", and "Levante") selected for short rotation coppice, and one natural clone, "Sacco", obtained from a contaminated area. Gas exchanges, chlorophyll a fluorescence (JIP-test), relative chlorophyll content, and biometric parameters were measured in plants grown for fifteen days in soil containing Zn concentrations of 0, 300, 750, and 1,500 mg(ZnCl2) kg-1. Ecophysiological response to metal stress differed in dependence on the Zn concentration and clone. At the low Zn concentration (300 mg kg-1), the absence of any significant reductions in parameters investigated indicated an efficient plant homeostasis to maintain the metal content within phytotoxic limits. Stomatal limitation, observed at 750 and 1,500 mg kg-1, which was found in all clones after three days of the treatment, might be caused by indirect effects of metal on guard cells. Among commercial clones, "Drago" was more sensitive to Zn stress, showing inhibition of growth, while "1962" clone showed a downregulation of PSII photochemistry following the slowdown in the Calvin-Benson cycle. On the contrary, the natural Salix clone ("Sacco") performed better compared to the other clones due to activation of a photosynthetic compensatory mechanism.
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Claims 6
Claim · model-written summary
Salix ecophysiological responses differed by zinc concentration and clone.
SalixOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ecophysiological response to metal stress differed in dependence on the Zn concentration and clone”
t0“Salix”
Claim · model-written summary
At 300 mg kg-1 Zn, investigated parameters had no significant reductions.
- Treatment
- 300 mg kg-1e0
- Outcome
- parameters investigatede0
- Direction
- absence of any significant reductionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the low Zn concentration (300 mg kg-1), the absence of any significant reductions in parameters investigated indicated an efficient plant homeostasis to maintain the metal content within phytotoxic limits”
t0“Salix”
Claim · model-written summary
At 750 and 1,500 mg kg-1, all clones showed stomatal limitation after three days.
- Treatment
- 750 and 1,500 mg kg-1e0
- Outcome
- Stomatal limitatione0
- Qualifier
- after three days of the treatmente0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stomatal limitation, observed at 750 and 1,500 mg kg-1, which was found in all clones after three days of the treatment”
t0“Salix”
Claim · model-written summary
Drago was more sensitive to Zn stress and showed inhibited growth.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“"Drago" was more sensitive to Zn stress, showing inhibition of growth”
t0“Salix”
Claim · model-written summary
Clone 1962 showed downregulated PSII photochemistry following a slowdown of the Calvin-Benson cycle.
- Material
- 1962e0
- Outcome
- PSII photochemistrye0
- Direction
- downregulatione0
- Qualifier
- following the slowdown in the Calvin-Benson cyclee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“"1962" clone showed a downregulation of PSII photochemistry following the slowdown in the Calvin-Benson cycle”
t0“Salix”
Claim · model-written summary
Natural clone Sacco performed better than the other clones.
- Material
- Saccoe0
- Outcome
- performed bettere0
- Direction
- bettere0
- Qualifier
- activation of a photosynthetic compensatory mechanisme0
- Comparator
- the other clonese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the natural Salix clone ("Sacco") performed better compared to the other clones due to activation of a photosynthetic compensatory mechanism”
The same questions in other papers
heavy metal · growth · Salix (willows)Results agree
2 papers in the same direction as this paper
- negative
- negative
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.