Photosynthetica 2016, 54(2):267-274 | DOI: 10.1007/s11099-016-0078-0

Zinc soil application enhances photosynthetic capacity and antioxidant enzyme activities in almond seedlings affected by salinity stress

A. Amiri1, B. Baninasab1, C. Ghobadi1, A. H. Khoshgoftarmanesh2
1 Department of Horticulture, College of Agriculture, Isfahan University of Technology, Isfahan, Iran
2 Department of Soil Science, College of Agriculture, Isfahan University of Technology, Isfahan, Iran

Zinc is a critical mineral nutrient that protects plant cells from salt-induced cell damage. We tested whether the application of Zn at various concentrations [0, 5, 10, or 20 mg kg-1(soil)] would protect almond (Prunus amygdalus) seedlings subjected to salt stress (0, 30, 60, or 90 mM NaCl). All concentrations of Zn, particularly the application of 10 and 20 mg kg-1, increased the net photosynthetic rate, stomatal conductance, the maximal efficiency of PSII photochemistry, and a proline content in almond seedlings grown under salt stress; 20 mg(Zn) kg-1 was the most effective concentration. The activity of superoxide dismutase showed a significant increase under salinity stress and Zn application. The catalase activity decreased in the salt-treated seedlings, but recovered after the Zn treatment. Our results proved the positive effects of Zn on antioxidant enzyme activity scavenging the reactive oxygen species produced under salt stress.

Additional key words: abiotic stress; gas exchange; net assimilation rate; reactive oxygen species

Received: April 13, 2015; Accepted: October 6, 2015; Published: June 1, 2016  Show citation

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Amiri, A., Baninasab, B., Ghobadi, C., & Khoshgoftarmanesh, A.H. (2016). Zinc soil application enhances photosynthetic capacity and antioxidant enzyme activities in almond seedlings affected by salinity stress. Photosynthetica, 54(2), 267-274. doi: 10.1007/s11099-016-0078-0
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