Plant growth, metabolism and adaptation in relation to stress conditions: Further studies supporting nullification of harmful effects of salinity in lettuce plants by urea treatment

M.N.A. Hasaneen, M.E. Younis and D.M.A. El-Bialy
Additional contact information
M.N.A. Hasaneen: Department of Botany, Faculty of Science, University of Mansoura, Mansoura, Egypt
M.E. Younis: Department of Botany, Faculty of Science, University of Mansoura, Mansoura, Egypt
D.M.A. El-Bialy: Department of Botany, Faculty of Science, University of Mansoura, Mansoura, Egypt

Plant, Soil and Environment, 2008, vol. 54, issue 3, 123-131

Abstract: Foliar application of urea to lettuce plants induced pronounced changes in the total amount and in the relative composition of the nitrogen pool. As compared with untreated lettuce plants, urease (UR), nitrate reductase (NR), asparaginase (AS) and glutamine synthetase (GS) activities were, in general, increased with an increase in the concentration of urea. On the other hand, salinization of lettuce plants with NaCl induced a significant decrease in the activities of UR, NR, AS and GS, at vegetative and adult growth stages. In general, treatment of lettuce plants with increasing concentrations of urea fertilizer in combination with each of the levels of salinity resulted in significant increases in all enzyme activities. Treatment with increasing concentrations of urea fertilizer induced significant decreases both in glycine and proline contents below control levels. On the other hand, salinization of lettuce plants with NaCl induced significant pronounced increases in the contents of the two amino acids. Further increments in glycine and proline contents were observed in differently salinized lettuce plants foliary sprayed with increasing concentrations of urea at vegetative and adult growth stages. Salinity solely enhanced the occurrence of novel proteins that were detected neither in the water control nor in the urea-treated plants. Protein banding patterns of lettuce plants treated with urea either alone or in combination with NaCl showed different de novo protein bands with different molecular weights, induced by urea and/or NaCl at vegetative and adult growth stages.

Keywords: Lactuca sativa L.; NaCl; urea; nitrogen content; amino acids; nitrogen enzymes; protein patterns (search for similar items in EconPapers)
Date: 2008
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://pse.agriculturejournals.cz/doi/10.17221/2775-PSE.html (text/html)
http://pse.agriculturejournals.cz/doi/10.17221/2775-PSE.pdf (application/pdf)
free of charge

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:54:y:2008:i:3:id:2775-pse

DOI: 10.17221/2775-PSE

Access Statistics for this article

Plant, Soil and Environment is currently edited by Kateřina Součková

More articles in Plant, Soil and Environment from Czech Academy of Agricultural Sciences
Bibliographic data for series maintained by Ivo Andrle ().