Salt Stress Perception and Plant Growth Regulators in the Halophyte Mesembryanthemum crystallinum.
AUTOR(ES)
Thomas, J. C.
RESUMO
We selected indicators of four different metabolic processes (Crassulacean acid metabolism [CAM], amino acid and nitrogen mobilization metabolism, osmoprotection, and plant defense mechanisms) to study the relationship between salt-stress-mediated and plant growth regulator (PGR)-induced responses in Mesembryanthemum crystallinum (ice plant). Nacl and PGRs (cytokinin and abscisic acid [ABA]) are efficient elicitors of the well-studied Nacl stress responses: induction of the CAM form of phosphoenolpyruvate carboxylase, proline pinitol accumulation, and the increase of an osmotin-like protein. NaCl and cytokinin are more effective than ABA in stimulating accumulation of proline and an osmotin-like protein before the plants are committed to flowering. The results are consistent with a plant defense-induction model, in which environmental stress and PGRs are distinct signals whose subsequent effects lead to overlapping responses, the magnitude of which depends on plant developmental status.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=159119Documentos Relacionados
- A novel methyl transferase induced by osmotic stress in the facultative halophyte Mesembryanthemum crystallinum.
- Characterization of a salt-responsive 24-kilodalton glycoprotein in Mesembryanthemum crystallinum.
- Early salt stress effects on the differential expression of vacuolar H(+)-ATPase genes in roots and leaves of Mesembryanthemum crystallinum.
- Nucleotide sequence of a cDNA encoding rbcS from the desert plant Mesembryanthemum crystallinum.
- Time Course of mRNA Induction Elicited by Salt Stress in the Common Ice Plant (Mesembryanthemum crystallinum) 1