보리 유묘기 (幼苗期) 의 한해 (旱害) 와 염해반응

Drought resistance and salt resistance of seedlings were compared with the polyethylene glycol(P.E.G.) and NaCl solutions of the same osmotic potential(Ψπ=-10 bar). Plant height, seedling dry weight, chlorophyll content and leaf water potential decreased while the free proline content increased more in the P.E.G. than in the NaCl solution. Free amino acids increased 2.6 times in the P.E.G. solution and 3.6 times in the NaCl solution more than in the untreated(Hoagland`s solution). Free proline occupied 66% and 61% of the content of total amino acids under water stress and salt stress, respectively. Besides free proline, phenylalanine in the P.E.G. solution and phenylalanine, alanine and asparagine in the NaCl solution increased distinctly. In short, it was shown that water and salt stress responses in seedling stage were relatively similar.