Abstract
Cadmium (Cd) is a toxic element for higher plants and it has been suggested that sugarcane (Saccharum spp.) can be used as a phytoextractor for this metal. Nutrient management represents an alternative for coping with Cd toxicity, although the importance of mineral nutrition on Cd stress tolerance has been scarcely investigated. The present study examined the effect of two levels of Cd (0 and 1 mM), in a nutrient solution used for irrigation, on leaf nutrient concentrations in sugarcane cultivar CP 72-2086 grown hydroponically under greenhouse conditions. After 50 days of treatment with Cd supplied at intervals of five days, the concentrations of N, P, K, Ca, Mg, Fe, Zn, Mn, B and Cd in sugarcane leaves were determined. Only N concentrations were negatively affected by the addition of Cd in nutrient solution, and were 50.3% lower compared to that observed in control plants. In contrast, concentrations of P, Mg, Zn and B were significantly higher in leaves of Cd-treated plants by approximately 34, 29, 37 and 40%, respectively, in comparison to control plants. Cadmium treatment had no significant effects on leaf concentrations of K, Ca, Fe and Mn, and this heavy metal was only detected in Cd-treated plants, with an average leaf concentration of 7.97 mg kg -1 dry matter. The results indicate that cultivar CP 72-2086 is tolerant to Cd concentrations of 1 mM under the conditions tested, and with the exception of N, all other nutrients were not negatively affected by this metal. This, along with high biomass production and ease of cultivation, makes sugarcane one of the most interesting crops for metal phytoextraction purposes.
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Claims 10
Claim · model-written summary
Adding Cd to the nutrient solution lowered leaf N concentration in sugarcane by 50.3% compared with control plants.
Verbatim
t0“sugarcane”
e0“Only N concentrations were negatively affected by the addition of Cd in nutrient solution, and were 50.3% lower compared to that observed in control plants”
Claim · model-written summary
Leaf P concentration was significantly higher in Cd-treated sugarcane than in control plants (about 34%).
Verbatim
t0“sugarcane”
e0“concentrations of P, Mg, Zn and B were significantly higher in leaves of Cd-treated plants by approximately 34, 29, 37 and 40%, respectively, in comparison to control plants”
Claim · model-written summary
Leaf Mg concentration was significantly higher in Cd-treated sugarcane than in control plants (about 29%).
Verbatim
t0“sugarcane”
e0“concentrations of P, Mg, Zn and B were significantly higher in leaves of Cd-treated plants by approximately 34, 29, 37 and 40%, respectively, in comparison to control plants”
Claim · model-written summary
Leaf Zn concentration was significantly higher in Cd-treated sugarcane than in control plants (about 37%).
Verbatim
t0“sugarcane”
e0“concentrations of P, Mg, Zn and B were significantly higher in leaves of Cd-treated plants by approximately 34, 29, 37 and 40%, respectively, in comparison to control plants”
Claim · model-written summary
Leaf B concentration was significantly higher in Cd-treated sugarcane than in control plants (about 40%).
Verbatim
t0“sugarcane”
e0“concentrations of P, Mg, Zn and B were significantly higher in leaves of Cd-treated plants by approximately 34, 29, 37 and 40%, respectively, in comparison to control plants”
Claim · model-written summary
Cd treatment had no significant effect on leaf concentrations of K, Ca and Fe in sugarcane.
- Taxon
- sugarcanet0
- Treatment
- Cadmium treatmente0
- Outcome
- leaf concentrations of K, Ca, Fee0
- Direction
- no significant effectse0
Not reportedComparator
Verbatim
t0“sugarcane”
e0“Cadmium treatment had no significant effects on leaf concentrations of K, Ca, Fe and Mn”
Claim · model-written summary
Cd treatment had no significant effect on leaf Mn concentration in sugarcane.
Not reportedComparator
Verbatim
t0“sugarcane”
e0“Cadmium treatment had no significant effects on leaf concentrations of K, Ca, Fe and Mn”
Claim · model-written summary
Cd was detected only in leaves of Cd-treated plants, at an average of 7.97 mg kg -1 dry matter.
Verbatim
t0“sugarcane”
e0“this heavy metal was only detected in Cd-treated plants, with an average leaf concentration of 7.97 mg kg -1 dry matter”
Claim · model-written summary
The authors conclude that sugarcane cultivar CP 72-2086 is tolerant to 1 mM Cd under the conditions tested.
Verbatim
t0“sugarcane”
e0“cultivar CP 72-2086 is tolerant to Cd concentrations of 1 mM under the conditions tested”
Claim · model-written summary
The authors consider sugarcane one of the most interesting crops for metal phytoextraction.
Verbatim
t0“sugarcane”
e0“makes sugarcane one of the most interesting crops for metal phytoextraction purposes”
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