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1999 (1)
1Author    Sunkar Ramanjulu3, Werner Kaiser3, Karl-Josef Dietz3-Requires cookie*
 Title    Salt and Drought Stress Differentially Affect the Accumulation of Extracellular Proteins in Barley  
 Abstract    Barley (Hordeum vulgare) was grown for eight days in the presence of a range of salt concentrations or subjected to repeated cycles of wilting and rehydration. Changes in apoplastic protein content, protein pattern, enzymic activities and ion composition were in­ vestigated under salinity and drought. The protein content of intercellular washing fluid (IW F) increased 2.5-to 3.0-fold when the NaCl concentration in the growth medium was increased from 0 to 100 mM. The elevated protein content was the result of a general increase in most polypeptides and a pronounced increase in the abundance of specific polypeptides of apparent molecular masses of 15, 21, 22, 26, 36, 40 and 62 kDa. Conversely, the IW F protein content decreased during wilting similar as after application of colchicin, cytochalasin B or cycloheximide suggesting that inihibition of protein synthesis or vesicle transport may be the cause for the decrease in apoplastic protein content and enzyme activities in dehydrat­ ing plant tissue. The changes in apoplastic protein content were accompanied by stress-spe-cific alterations in activities of apoplastic enzymes. The greater apoplastic protein content was the consequence of stimulated protein synthesis in the presence of NaCl, as evidenced by increased incorporation of [35S]-methionine into IW F protein. The results demonstrate that the leaf apoplast is a compartment which sensitively and differentially responds to drought and salinity with consequences for plant growth. 
  Reference    Z. Naturforsch. 54c, 337—347 (1999); received February 5/February 23 1999 
  Published    1999 
  Keywords    Apoplast, Barley, Drought, Hydrolytic Enzymes, Polypeptide, Salinity 
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 TEI-XML for    default:Reihe_C/54/ZNC-1999-54c-0337.pdf 
 Identifier    ZNC-1999-54c-0337 
 Volume    54