Abstract
Two main components of plant energy balance are analyzed--photosynthesis and dark respiration. Different plant species, growing in optimal conditions and differing in photosynthetic metabolism, productivity and potential resistance to stress, have constant ratio between total dark respiration and grossphotosynthesis. The ratio about 38-40% at the phase of active growth. This value reflect plant state, when income (assimilation) is maximized, and expense (total oxidation) is minimized. Intensities of dark respiration of plants in darkness and light are similar despite the fact that the plants have considerable differences: 1) different carbon sources--young assimilates in light and reserve ones in the dark; 2) biochemical modifications (or inhibition) of some stages of dark respiration in light; 3) intensification of alternative respiration in unfavourable conditions differing in dark and light variants. Ratio between intensity of dark respiration and photosynthesis increases in plants growing in unfavourable conditions. This increase is more considerable in plants that are less resistant to the given stress. Characters of energy balance can be used for estimation of physiological status of plants, prediction of resistance and potential productivity at seedling stage.
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Claims 5
Claim · model-written summary
Different plant species under optimal conditions had a constant ratio of dark respiration to gross photosynthesis, about 38–40% during active growth.
Verbatim
e0“Different plant species, growing in optimal conditions and differing in photosynthetic metabolism, productivity and potential resistance to stress, have constant ratio between total dark respiration and grossphotosynthesis. The ratio about 38-40% at the phase of active growth.”
Claim · model-written summary
Dark respiration intensities were similar in darkness and light.
- Taxon
- plantsViridiplantaee0
- Outcome
- Intensities of dark respiratione0
- Direction
- similare0
- Comparator
- darkness and lighte0
Verbatim
e0“Intensities of dark respiration of plants in darkness and light are similar”
Claim · model-written summary
The ratio of dark respiration intensity to photosynthesis increased under unfavorable growth conditions.
- Taxon
- plantsViridiplantaee0
- Outcome
- Ratio between intensity of dark respiration and photosynthesise0
- Direction
- increasese0
- Setting
- unfavourable conditionse0
Verbatim
e0“Ratio between intensity of dark respiration and photosynthesis increases in plants growing in unfavourable conditions.”
Claim · model-written summary
The respiration to photosynthesis ratio increased more in plants less resistant to the stress.
Verbatim
e0“This increase is more considerable in plants that are less resistant to the given stress.”
e1“Ratio between intensity of dark respiration and photosynthesis increases in plants growing in unfavourable conditions.”
Claim · model-written summary
The authors propose energy balance characteristics for estimating physiological status and predicting resistance and potential productivity at the seedling stage.
- Taxon
- plantsViridiplantaee0
- Organ / stage
- seedling stagee0
- Outcome
- estimation of physiological status of plants, prediction of resistance and potential productivitye0
Verbatim
e0“Characters of energy balance can be used for estimation of physiological status of plants, prediction of resistance and potential productivity at seedling stage.”