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1999 (1)
1985 (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 
2Author    Günter Döhler, Joachim ZinkRequires cookie*
 Title    and Amino Acid Pools of Bellerochea yucatanensis (v. Stosch) and Thalassiosira rotula (Meunier)  
 Abstract    The marine diatoms Bellerochea yucatanensis and Thalassiosira rotula were grown at different salinities (20/25, 35, and 40/45%o salinity (S), respectively) under normal air (0.035 vol.% C 0 2). No significant variations in the percentage of gross photosynthetic products (e.g. total amino acids, sugar phosphates) were found as a function of salinity during growth. The bulk of the soluble 14C-radioactivity was detected in amino acids. 14C-labelling of glutamine increased mark­ edly with salinity. Low salt — grown algae are characterized by enhanced amino acid pools, mainly of aspartic acid, asparagine and glutamine. It was found that the tested amino acids are not involved in osmoregulation. 
  Reference    Z. Naturforsch. 40c, 527—530 (1985); received March 16/April 24 1985 
  Published    1985 
  Keywords    14C 0 2 Fixation, Amino Acid Pools, Salinity, Marine Diatoms 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0527.pdf 
 Identifier    ZNC-1985-40c-0527 
 Volume    40