Limits...
Effect of potassium deficiency on antioxidant status and cadmium toxicity in rice seedlings

View Article: PubMed Central

ABSTRACT

Background: Cadmium (Cd) is one of the most toxic heavy metals and inhibits physiological processes of plants. Potassium (K) is an essential macronutrient in plants. K deficiency and Cd stress represent two different abiotic stress conditions that occur in the field simultaneously. In this study, effects of K deficiency on antioxidant status and Cd toxicity in rice seedlings were investigated.

Results: K deficiency significantly decreased K concentration in shoots and roots. However, fresh weight and dry weight of rice seedlings were not affected by K deficiency. The activities of antioxidant enzymes (superoxide dismutase, ascorbate peroxidase, glutathione reductase, and catalase) in K-deficient leaves were higher than respective control leaves. However, K deficiency had no effect on the content of antioxidants (ascorbate and glutathione). Cd toxicity was judged by the decrease in biomass production, chlorosis, and induction of oxidative stress. Based on these criteria, we demonstrated that K deficiency protected rice seedling from Cd stress. Moreover, chlorophyll concentration was higher in K-deficient shoots and roots than their respective control shoots and roots.

Conclusions: Our results indicated that K deficiency protects rice seedlings from Cd toxicity. This protective effect of K deficiency is mainly due to enhanced antioxidant enzyme activities but not inhibition of Cd uptake.

Electronic supplementary material: The online version of this article (doi:10.1186/1999-3110-54-2) contains supplementary material, which is available to authorized users.

No MeSH data available.


Related in: MedlinePlus

The fresh weight (FW) (A, D), dry weight (DW) (B, E) and K concentration (C, F) in shoots and roots of rice seedlings. Rice seedlings were grown under K-sufficient (control) and -deficient (−K) conditions for 12 days. The shoots and roots were then used to determine FW, DW, and K concentration. Bars indicate standard errors (n = 4). Asterisks represent values that are significantly different between control and − K treatments at P < 0.05.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC5383923&req=5

Fig1: The fresh weight (FW) (A, D), dry weight (DW) (B, E) and K concentration (C, F) in shoots and roots of rice seedlings. Rice seedlings were grown under K-sufficient (control) and -deficient (−K) conditions for 12 days. The shoots and roots were then used to determine FW, DW, and K concentration. Bars indicate standard errors (n = 4). Asterisks represent values that are significantly different between control and − K treatments at P < 0.05.

Mentions: To examine the effect of K deficiency on growth response and K concentration, rice seedlings were grown under conditions of sufficient (control) and deficient K supply (−K) for 12 days. The FW and DW of both shoots and roots were not affected by K deficiency (Figure 1A, B, D, E). However, K deficiency resulted in a decrease in K concentration in shoots and roots (Figure 1C, F).Figure 1


Effect of potassium deficiency on antioxidant status and cadmium toxicity in rice seedlings
The fresh weight (FW) (A, D), dry weight (DW) (B, E) and K concentration (C, F) in shoots and roots of rice seedlings. Rice seedlings were grown under K-sufficient (control) and -deficient (−K) conditions for 12 days. The shoots and roots were then used to determine FW, DW, and K concentration. Bars indicate standard errors (n = 4). Asterisks represent values that are significantly different between control and − K treatments at P < 0.05.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5383923&req=5

Fig1: The fresh weight (FW) (A, D), dry weight (DW) (B, E) and K concentration (C, F) in shoots and roots of rice seedlings. Rice seedlings were grown under K-sufficient (control) and -deficient (−K) conditions for 12 days. The shoots and roots were then used to determine FW, DW, and K concentration. Bars indicate standard errors (n = 4). Asterisks represent values that are significantly different between control and − K treatments at P < 0.05.
Mentions: To examine the effect of K deficiency on growth response and K concentration, rice seedlings were grown under conditions of sufficient (control) and deficient K supply (−K) for 12 days. The FW and DW of both shoots and roots were not affected by K deficiency (Figure 1A, B, D, E). However, K deficiency resulted in a decrease in K concentration in shoots and roots (Figure 1C, F).Figure 1

View Article: PubMed Central

ABSTRACT

Background: Cadmium (Cd) is one of the most toxic heavy metals and inhibits physiological processes of plants. Potassium (K) is an essential macronutrient in plants. K deficiency and Cd stress represent two different abiotic stress conditions that occur in the field simultaneously. In this study, effects of K deficiency on antioxidant status and Cd toxicity in rice seedlings were investigated.

Results: K deficiency significantly decreased K concentration in shoots and roots. However, fresh weight and dry weight of rice seedlings were not affected by K deficiency. The activities of antioxidant enzymes (superoxide dismutase, ascorbate peroxidase, glutathione reductase, and catalase) in K-deficient leaves were higher than respective control leaves. However, K deficiency had no effect on the content of antioxidants (ascorbate and glutathione). Cd toxicity was judged by the decrease in biomass production, chlorosis, and induction of oxidative stress. Based on these criteria, we demonstrated that K deficiency protected rice seedling from Cd stress. Moreover, chlorophyll concentration was higher in K-deficient shoots and roots than their respective control shoots and roots.

Conclusions: Our results indicated that K deficiency protects rice seedlings from Cd toxicity. This protective effect of K deficiency is mainly due to enhanced antioxidant enzyme activities but not inhibition of Cd uptake.

Electronic supplementary material: The online version of this article (doi:10.1186/1999-3110-54-2) contains supplementary material, which is available to authorized users.

No MeSH data available.


Related in: MedlinePlus