Abstract
Soil contamination with heavy metals has become a worldwide problem, leading to losses in agricultural yield and hazardous health effects as they enter the food chain . Nickel as an essential trace element, affect a number of biochemical and physiological processes in plants in toxic levels. The most common symptoms are chlorosis, and inhibited photosynthesis and respiration. Zea mays seeds were germinated and cultured on nutrient solution with nickel concentrations of 50-200 μmol for a period of two weeks. Studied physiological makers included photosynthetic pigments content, the rate of Hill reaction, K+ efflux and carbohydrate leakage from the roots to the external solution and cell death as a Ni-induced membrane damage. By increasing Ni concentration up to 100 μmol, the content of chlorophyll a increased, but decreased at 200 μmol Ni. No significant changes in chlorophyll b and carotinoids content observed.The rate of Hill reaction as an ability of chlorophyll a in the reaction center of PSII680 to split water, decreased by increasing Ni concentration. Different concentrations of nickel increased the K+ efflux and sugar leakage from roots to the culture and the cell death of root tips. The present results suggested that the disruption of photosynthesis by Ni cannot be attributed to any single factor and appears to result from its combined effects on chloroplast structure, chlorophyll content and photosynthetic protein complexes and treatment with different levels of nickel may induce structural damage and alterations in membrane properties by generation of reactive oxygen species.
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Claims 6
Claim · model-written summary
In maize, content of chlorophyll a increased under nickel exposure.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By increasing Ni concentration up to 100 μmol, the content of chlorophyll a increased, but decreased at 200 μmol Ni.”
t0“Effects of Ni2+ toxicity on Hill reaction and membrane functionality in maize”
Claim · model-written summary
In maize, content of chlorophyll a decreased under nickel exposure.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“By increasing Ni concentration up to 100 μmol, the content of chlorophyll a increased, but decreased at 200 μmol Ni.”
t0“Effects of Ni2+ toxicity on Hill reaction and membrane functionality in maize”
Claim · model-written summary
In maize, chlorophyll b and carotinoids content no significant changes under nickel exposure.
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No significant changes in chlorophyll b and carotinoids content observed.”
t0“Effects of Ni2+ toxicity on Hill reaction and membrane functionality in maize”
Claim · model-written summary
In maize, rate of Hill reaction decreased under nickel exposure.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The rate of Hill reaction as an ability of chlorophyll a in the reaction center of PSII680 to split water, decreased by increasing Ni concentration.”
t0“Effects of Ni2+ toxicity on Hill reaction and membrane functionality in maize”
Claim · model-written summary
In maize, K+ efflux and sugar leakage increased under nickel exposure.
- Treatment
- Different concentrations of nickele0
- Outcome
- K+ efflux and sugar leakagee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Different concentrations of nickel increased the K+ efflux and sugar leakage from roots to the culture and the cell death of root tips.”
t0“Effects of Ni2+ toxicity on Hill reaction and membrane functionality in maize”
Claim · model-written summary
In maize, cell death of root tips increased under nickel exposure.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Different concentrations of nickel increased the K+ efflux and sugar leakage from roots to the culture and the cell death of root tips.”
t0“Effects of Ni2+ toxicity on Hill reaction and membrane functionality in maize”
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