The sensitivity of four radish (Raphanus sativus L.) cultivars, Baladey “B,” Cherry Belle “CB,” Prinz Rotin “PR,” and Scarlet Globe “SG” to 80 nL L⁻¹ ozone is assessed in fumigation chambers. O₃ visible injury symptoms appears as brown spots to chlorotic areas, but the response is cultivar-specific. O₃ induces higher content of H₂O₂ and lipid peroxidation (it is estimated as malondialdehyde (MDA) content), leading to drastic visible injury symptoms in B compared to the other cultivars. Root and shoot dry weights, Chlorophyll a, net photosynthetic rates, and chlorophyll fluorescence are reduced in B to a greater extent than the other cultivars. On the other hand, stomatal conductance increased in B and CB (+52 and +24%, respectively) due to O₃ -exposure, while it was decreased by 35% in PR and SG. Exposure to O₃ generates oxidative stress leading to stimulation of antioxidative defense systems. SG shows the highest induction of catalase (CAT), superoxide dismutase (SOD), and glutathione reductase (GR), while B had the lowest activities of these antioxidative enzymes, but had the highest H₂O₂ and MDA content. The higher accumulation of H₂O₂, poor induction of antioxidative enzymes, and increased stomatal conductance led to severe visible injury and drastic inhibition in photosynthetic rates and growth in B than other cultivars depicting its higher sensitivity toward O₃. Therefore, it can be used as a bioindicator for O₃ pollution worldwide.

Radish (Raphanus sativus L.) cultivar-specific response to O₃: pbtterns of Biochemical and plant growth characteristics

Cotrozzi L;
2018-01-01

Abstract

The sensitivity of four radish (Raphanus sativus L.) cultivars, Baladey “B,” Cherry Belle “CB,” Prinz Rotin “PR,” and Scarlet Globe “SG” to 80 nL L⁻¹ ozone is assessed in fumigation chambers. O₃ visible injury symptoms appears as brown spots to chlorotic areas, but the response is cultivar-specific. O₃ induces higher content of H₂O₂ and lipid peroxidation (it is estimated as malondialdehyde (MDA) content), leading to drastic visible injury symptoms in B compared to the other cultivars. Root and shoot dry weights, Chlorophyll a, net photosynthetic rates, and chlorophyll fluorescence are reduced in B to a greater extent than the other cultivars. On the other hand, stomatal conductance increased in B and CB (+52 and +24%, respectively) due to O₃ -exposure, while it was decreased by 35% in PR and SG. Exposure to O₃ generates oxidative stress leading to stimulation of antioxidative defense systems. SG shows the highest induction of catalase (CAT), superoxide dismutase (SOD), and glutathione reductase (GR), while B had the lowest activities of these antioxidative enzymes, but had the highest H₂O₂ and MDA content. The higher accumulation of H₂O₂, poor induction of antioxidative enzymes, and increased stomatal conductance led to severe visible injury and drastic inhibition in photosynthetic rates and growth in B than other cultivars depicting its higher sensitivity toward O₃. Therefore, it can be used as a bioindicator for O₃ pollution worldwide.
2018
Hassan, Ia; Bell, Nb; Ashmore, Mr; Cotrozzi, L; Haiba, Ns; Basahi, Jm; Summan, A; Almeelbi, T; Ismail, Im
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/1140607
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