EFFECTS OF SALT STRESS ON A TYPICAL HEDGE SHRUB: VIBURNUM ODORATISSIMUM
The aim of this research was to evaluate the effects of sodium chloride (NaCl) levels on plant development, water relations and photosynthesis performances in Viburnum odoratissimum, in order to assess its adaptability to salt stress. The plants were grown in pots filled with peat and pumice (1:1) in a greenhouse in central Italy during summer season. Treatments consisted of four irrigation solutions containing 0 mM, 20 mM, 40 mM and 60 mM NaCl. Studied parameters were biometric measurements, water relations (predawn, ΨPD, and midday leaf water potential, ΨMD, and leaf osmotic potential, Ψπ), gas exchange (net photosynthesis, transpiration, stomatal conductance and internal CO2 concentration) and chlorophyll a fluorescence. Ion concentrations (Na+, Cl-, K+ and NO3-) were determined at the end of the trial. Results showed that salt stress did not affect the ornamental quality of Viburnum, even at the highest concentrations of NaCl. Salt stress resulted in a significant lower plant growth, but did not produce necrosis. ΨPD, ΨΨMD and Ψπ decreased significantly after 90 days of exposure to 40 and 60 mM NaCl, while analysis of midday Ψπ showed that V. odoratissimum responds to saline stress by osmotic adjustment. Gas exchange parameters decreased progressively in all treatments. Chl a fluorescence did not show a significant difference among the treatments and no photodamage was observed. The concentration of Na+ and Cl- increased with increasing salinity, K+ decreased, while NO3- accumulation was not affected.
Cacini, S., Pacifici, S., Burchi, G. and Grassotti, A. (2013). EFFECTS OF SALT STRESS ON A TYPICAL HEDGE SHRUB: VIBURNUM ODORATISSIMUM . Acta Hortic. 990, 151-158
water relations, gas exchange, chlorophyll a fluorescence, ion concentrations