Methyl jasmonate, calcium, and leaf senescence in rice
1Department of Agronomy, National Taiwan University, Taipei, Taiwan, Republic of China.
Plant Physiology
|August 1, 1992
Summary
Calcium significantly reduces methyl jasmonate-induced senescence in detached rice leaves. This suggests methyl jasmonate may promote leaf aging by hindering calcium ion entry into plant cells.
Area of Science:
- Plant Physiology
- Molecular Biology
Background:
- Methyl jasmonate is known to induce senescence in plant tissues.
- Calcium ions play crucial roles in various plant cellular processes.
Purpose of the Study:
- To investigate the role of calcium in methyl jasmonate-promoted senescence of detached rice leaves.
- To elucidate the mechanism by which methyl jasmonate affects rice leaf senescence.
Main Methods:
- Detached rice leaves were treated with methyl jasmonate.
- The effect of calcium and calcium ionophore A23187 on methyl jasmonate-induced senescence was assessed.
Main Results:
- Calcium treatment significantly reduced methyl jasmonate-induced senescence in detached rice leaves.
- Calcium ionophore A23187 also significantly diminished the senescence-promoting effect of methyl jasmonate.
Conclusions:
- Calcium plays an inhibitory role in methyl jasmonate-promoted senescence of rice leaves.
- Methyl jasmonate may induce senescence by blocking calcium ion influx into the cytosol.
Related Concept Videos
01:57Adaptations that Reduce Water Loss
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
02:02Responses to Salt Stress
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and crop production by influencing photosynthesis and the absorption of water and nutrients.
02:41Responses to Drought and Flooding
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
01:25Cell Signaling in Plants
Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
02:04Regulation of Transpiration by Stomata
During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.
01:56Plant Hormones
Plant hormones—or phytohormones—are chemical molecules that modulate one or more physiological processes of a plant. In animals, hormones are often produced in specific glands and circulated via the circulatory system. However, plants lack hormone-producing glands.