The effect of low concentration of some stress-inducing compounds of different toxicity and chemical nature like Pb and Ti salts or DCMU on the senescence of chloroplasts was investigated in detached primary leaves of barley (Hordeum vulgare cv. Omega). These agents stimulated chlorophyll accumulation, photosynthetic activity (14CO2 fixation), and decreased the number of plastoglobuli in chloroplasts compared to the control, thus delaying senescence. Low-concentration stressors did not increase the level of active cytokinins of leaves during the treatment. Lithium and stearoylcarnitine chloride inhibited the stimulating effect of stressors. This points to the involvement of the PIP2-IP3/DAG signal transduction pathway in generation of the specific responses.
- Hordeum vulgare
- PIP-IP/DAG pathway
ASJC Scopus subject areas
- Ecology, Evolution, Behavior and Systematics
- Plant Science