THE SALINITY EFFECT ON MORPHOLOGY AND PIGMENTS CONTENT IN THREE PAULOWNIA CLONES GROWN EX VITRO
Keywords:
hydroponic, morphology, Paulownia, pigments, salinityAbstract
We evaluated the effect of salt stress on growth parameters, chlorophyll a, chlorophyll b and carotenoids content in Paulownia
clones (P. elongata x fortunei x elongata – T2, P. elongata x elongata – T4, P. elongata x kawakarnii – EK) grew as hydroponic
culture at three levels of salinity, 50 mmol.l–1, 100 mmol.l–1, 200 mmol.l–1 sodium chloride (NaCl) solution. The root
and stem length, as well as leaf number and total leaf area of T2 clone were reduced insignifi cantly in comparison with these
of T4 and EK clones during NaCl treatment. Control of T2 clone was characterized with approximately twice higher total dry
mass per plant than EK and T4 clones. The root dry mass to shoot dry mass ratios of three clones changed in a different manner
with increasing salinity levels and was highest in EK clone at 200 mmol.l–1 NaCl, followed by T4 and T2. The total leaf area
showed the capability of a plant in forming of photosynthetic surface and was reduced more in T4 and EK clones under salt
stress. Our results suggest that T2 clone was more tolerant to salt stress than EK and T4 clones.
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