Protection induced by external Ca +2 application on proline accumulation, ion balance, photosynthetic pigments, protein and ABA concentration of mustard seedlings (Sinapis alba L.) under salinity stress
ABSTRACT The effect of external Ca 2+ application of different concentration to salinity-treated (100 mM NaCl) mustard plant (Sinapis alba L.) was investigated in relation to ion uptake, proline, chlorophyll a&b, protein and ABA concentrations. Salinity treatment (100 mM NaCl) led to significant decreases in Ca 2+ & K + uptake and Chl. a&b contents, accompanied by significant increases in Na + uptake, proline and ABA concentrations. Salinity treatment also induced the appearance of new protein bands. The most effective concentrations of CaCl 2 treatment in protecting mustard plants against the adverse effect of NaCl salinity were 5, 10, and 15 mM CaCl 2 . This could be attributed to the effect of CaCl 2 in decreasing ABA concentration, the synthesis of new polypeptides and increasing K + and Ca 2+ uptake
