Photosynthetica, 2014 (vol. 52), issue 1

Photosynthetica 2014, 52(1):134-147 | DOI: 10.1007/s11099-014-0015-z

Growth, photosynthesis and ion balance of sesame (Sesamum indicum L.) genotypes in response to NaCl concentration in hydroponic solutions

A. H. Bazrafshan1, P. Ehsanzadeh1,*
1 College of Agriculture, Department of Agronomy and Plant Breeding, Isfahan University of Technology, Isfahan, Iran

A hydroponic, greenhouse experiment was conducted to assess the effects of NaCl on growth, gas-exchange parameters, chlorophyll (Chl) content, and ion distribution in seven sesame (Sesamum indicum L.) genotypes (Ardestan, Varamin, Naz-Takshakhe, Naz-Chandshakhe, Oltan, Yekta, Darab). The plants were grown in 4-L containers and subjected to varying levels of salinity (0, 30, and 60 mM NaCl). After 42 days, salt treatments induced decreases of plant fresh and dry mass, total leaf area, and plant height in all genotypes. Increasing NaCl concentration caused significant, genotypedependent decrease in the net photosynthetic rate, stomatal conductance, Chl content, and maximum quantum efficiency of photosystem II, while it increased the intercellular CO2 concentration. Based on the dry matter accumulation under salinity, the genotypes were categorized in two groups, i.e., salt-tolerant and salt-sensitive. The impact of salt on plant ion concentrations differed significantly among the sesame genotypes and between both two groups. The plant Na+ concentrations were significantly lower in Ardestan, Darab, and Varamin genotypes than those found in the remaining genotypes. The highest plant K+ and Ca2+ concentrations together with the lowest Na+/K+ and Na+/Ca2+ ratios were observed in Ardestan, Varamin, and Darab genotypes. Our results indicated the presence of differences in salt response among seven sesame genotypes. It suggested that growth and photosynthesis could depend on ion concentrations and ratios in sesame.

Keywords: chlorophyll fluorescence; gas exchange; potassium; salinity; sodium

Received: February 13, 2013; Accepted: October 18, 2013; Published: March 1, 2014Show citation

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Bazrafshan, A.H., & Ehsanzadeh, P. (2014). Growth, photosynthesis and ion balance of sesame (Sesamum indicum L.) genotypes in response to NaCl concentration in hydroponic solutions. Photosynthetica, 52(1), 134-147. doi: 10.1007/s11099-014-0015-z.
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