Protection induced by external Ca2+ application on proline accumulation, ion balance, photosynthetic pigments, protein and ABA concentration of mustard seedlings (Sinapis alba L.) under salinity stress
AbstractThe effect of external Ca2+ 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 Ca2+& Kuptake 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 CaCl2 treatment in protecting mustard plants against the adverse effect of NaCl salinity were 5, 10, and 15 mM CaCl2. This could be attributed to the effect of CaCl2 in decreasing ABA concentration, the synthesis of new polypeptides and increasing K+ and Ca2+ uptake.
KEY WORDS: salinity, CaCl2, proline, protein, ABA.
Egyptian Journal of Biology Vol.4 2002: 14-22