Osmotin Gene Expression Is Posttranscriptionally Regulated

Salt Stress Perception and Plant Growth Regulators in the Halophyte Mesembryanthemum crystallinum

“…Osmotins are induced not only by salt stress but by other factors, including biotic stresses (Singh et al, 1987;Neal et al, 1990;LaRosa et al, 1992). We observed the induction of a 24-kD osmotin-like protein in leaves following salt stress or cytokinin treatment (Figs.…”

“…Several osmotin-like proteins, stress-reponsive and constitutively expressed isoforms, are present in the ice plant. Recently, transcriptional activation of the osmotin promoter by treatment with ABA has been reported ; however, ABA treatment did not lead to an increase in osmotin protein in the absence of NaCI (LaRosa et al, 1992), indicating that posttranscriptional control mechanisms are important. Similarly, ABA did not increase osmotin protein in the ice plant, in contrast to either cytokinin or NaCI stress in either gelatin or milkblocked western blots (data not shown).…”

Identification and Characterization of a Fruit-Specific, Thaumatin-Like Protein That Accumulates at Very High Levels in Conjunction with the Onset of Sugar Accumulation and Berry Softening in Grapes

“…VVTL1 was readily detectable 11 weeks postflowering and, although its level appeared to increase throughout ripening, the relatively slow rate of accumulation from weeks 13 to 17 postflowering could, given the high mRNA levels, indicate that some protein turnover or posttranscriptional control is taking place, as was previously observed for a tobacco osmotin (LaRosa et al, 1992).…”

Antagonistic effects of abscisic acid and jasmonates on salt stress-inducible transcripts in rice roots.

“…ABA also triggered osdrr transcript ( Figure 8) accumulation but no PR-10 protein accumulation ( Figures 3D and 3E). Analogously, ABA has been demonstrated to induce transcript but no protein accumulation of the osmotin gene, which is also responsive to salt stress as well as jasmonates and is involved in plant pathogen defense responses (La Rosa et al, 1992;Liu et al, 1994). Besides ABA, additional stress-induced regulators are apparently required to trigger protein expression.…”

“…E-mail mamona gengenp.rug.ac. be; fax 32-9-2645349. lyase (Gundlach et al, 1992) and chalcone synthase (Lee et al, 1996), and different pathogenesis-related (PR) proteins (La Rosa et al, 1992;Xu et al, 1994;Schweizer et al, 1997). Jasmonates were also found to induce a ribosome-inactivating protein in barley leaves Chaudry et al, 1994;Reinbothe et al, 1994) and different types of lipoxygenase (LOX) isoforms involved in JA biosynthesis in various plants (Grimes et al, 1992;Melan et al, 1993;Bell et al, 1995).…”