![]() Investigation of spatially-fixed leaves of pea plants showed that the modified PRI with the shorter measuring wavelength (515 nm) was increased under response of drought and heat by contrast, the modified PRI with the longer wavelength (555 nm) was decreased under response to these stressors. The current work was devoted to the analysis of sensitivity of these modified PRIs to action of drought and short-term heat stress. Earlier, we proposed series of modified PRIs with moderate shifts of the measuring wavelength and showed that these indices can be effective for revealing photosynthetic changes under fluctuations in light intensity. The photochemical reflectance index (PRI) based on plant reflectance at 531 nm (measuring wavelength) and 570 nm (reference wavelength) can be effective tool of revealing plant stress changes (mainly, photosynthetic changes) however, its efficiency is strongly varied at different conditions. Development of optical methods of revealing influence of stressors on plants is an important task for plant investigations. These stressors can induce both damage of physiological processes and adaptive changes including signaling-based changes. In environmental conditions, plants can be affected by the action of numerous abiotic stressors. Thus PRI can be potentially used for monitoring the systemic photosynthetic response connected with long-distance electrical signalling. ![]() Additional analysis showed that changes in PRI were caused by an increase of the energy-dependent quenching induced by electrical signals. We showed that electrical signals decreased the quantum yields of PSI and PSII and increased the nonphotochemical quenching of intact leaves in times ranging from minutes to tens of minutes the changes were strongly connected with changes in PRI. We investigated changes in PRI and photosynthetic parameters (quantum yields of PSI and PSII and nonphotochemical quenching) in intact leaves of pea (Pisum sativum L.) after local heating of another leaf and the propagation of electrical signals through the plant body. Potentially, measurement of the response by using a photochemical reflectance index (PRI) could be the basis of monitoring photosynthesis under spatially heterogeneous stressors however, the method has not been previously used for investigating the systemic photosynthetic response. A fast systemic photosynthetic response, which is connected with long-distance electrical signalling, plays an important role in the adaptation of higher plants to the action of stressors. Plants can be affected by numerous environmental stressors with spatially heterogeneous actions on their bodies.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |