Photosynthetica 2019, 57(2):438-445 | DOI: 10.32615/ps.2019.055

Seed priming with calcium chloride improves the photosynthesis performance of faba bean plants subjected to cadmium stress

I. NOUAIRI1,, K. JALALI1, F. ZRIBI2, F. BARHOUMI1, K. ZRIBI1, H. MHADHBI1
1 Laboratory of Legumes, Centre of Biotechnology of Borj Cedria, B. P. 901, 2050 Hammam-Lif, Tunisia
2 Laboratory of Extremophile Plants, Centre of Biotechnology of Borj Cedria, B. P. 901, 2050 Hammam-Lif, Tunisia

Faba bean (Vicia faba L.) seeds were treated with H2O [nonprimed (NP)] or 2% CaCl2 [primed (P)] before germination for 6 h. After seven days, seedlings were exposed to 0 or 50 µM CdCl2 concentrations for three weeks. Under Cd treatment, P plants showed an improvement of gas-exchange characteristics, chlorophyll (Chl) and carotenoids contents as compared to NP plants subjected to Cd stress. Additionally, the values of Chl fluorescence were relatively similar to those of control, implying that no photodamage occurred. Moreover, under 50 µM Cd, the P plants exhibited lesser accumulation of hydrogen peroxide and superoxide radicals in leaves as compared to NP plants. Likewise, results showed that CaCl2-seed pretreatment alleviated adverse effects of Cd on electrolyte leakage. In conclusion, CaCl2 improved photosynthesis attributes of faba bean plants subjected to Cd stress by mitigating the adverse effects of Cd toxicity through a reduced generation of reactive oxygen species.

Keywords: nonphotochemical quenching; photosynthetic apparatus; seed priming; water-use efficiency.

Received: April 18, 2018; Accepted: November 14, 2018; Prepublished online: March 4, 2019; Published: May 16, 2019Show citation

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NOUAIRI, I., JALALI, K., ZRIBI, F., BARHOUMI, F., ZRIBI, K., & MHADHBI, H. (2019). Seed priming with calcium chloride improves the photosynthesis performance of faba bean plants subjected to cadmium stress. Photosynthetica, 57(2), 438-445. doi: 10.32615/ps.2019.055.
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