AI Article Synopsis
- Local damage in plants, such as burning or crushing, triggers a unique electrical signal called variation potential (VP), which affects key processes like photosynthesis and respiration.
- Research on pea seedlings showed that the inactivation of H-ATPase in the plasma membrane is crucial for the generation of VP and its influence on these physiological responses.
- The study found that changes in H-ATPase activity affected photosynthetic and respiratory responses in seedlings, with reduced activity leading to decreased photosynthesis and increased respiration.
Article Abstract
Local damage (e.g., burning, heating, or crushing) causes the generation and propagation of a variation potential (VP), which is a unique electrical signal in higher plants. A VP influences numerous physiological processes, with photosynthesis and respiration being important targets. VP generation is based on transient inactivation of H-ATPase in plasma membrane. In this work, we investigated the participation of this inactivation in the development of VP-induced photosynthetic and respiratory responses. Two- to three-week-old pea seedlings ( L.) and their protoplasts were investigated. Photosynthesis and respiration in intact seedlings were measured using a GFS-3000 gas analyzer, Dual-PAM-100 Pulse-Amplitude-Modulation (PAM)-fluorometer, and a Dual-PAM gas-exchange Cuvette 3010-Dual. Electrical activity was measured using extracellular electrodes. The parameters of photosynthetic light reactions in protoplasts were measured using the Dual-PAM-100; photosynthesis- and respiration-related changes in O exchange rate were measured using an Oxygraph Plus System. We found that preliminary changes in the activity of H-ATPase in the plasma membrane (its inactivation by sodium orthovanadate or activation by fusicoccin) influenced the amplitudes and magnitudes of VP-induced photosynthetic and respiratory responses in intact seedlings. Decreases in H-ATPase activity (sodium orthovanadate treatment) induced fast decreases in photosynthetic activity and increases in respiration in protoplasts. Thus, our results support the effect of H-ATPase inactivation on VP-induced photosynthetic and respiratory responses.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7697462 | PMC |
| http://dx.doi.org/10.3390/plants9111585 | DOI Listing |
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