Abstract
Drought stress can imprint marks in plants after a previous exposure, leading to plant acclimation and a permissive state that facilitates a more effective response to subsequent stress events. Such stress imprints would benefit plants obtained through vegetative propagation (propagules). Herein, our hypothesis was that the propagules obtained from plants previously exposed to water deficit would perform better under water deficit as compared to those obtained from plants that did not face stressful conditions. Sugarcane plants were grown under well-hydrated conditions or subjected to three cycles of water deficit by water withholding. Then, the propagules were subjected to water deficit. Leaf gas exchange was reduced under water deficit and the propagules from plants that experienced water deficit presented a faster recovery of CO2 assimilation and higher instantaneous carboxylation efficiency after rehydration as compared to the propagules from plants that never faced water deficit. The propagules from plants that faced water deficit also showed the highest leaf proline concentration under water deficit as well as higher leaf H2O2 concentration and leaf ascorbate peroxidase activity regardless of water regime. Under well-watered conditions, the propagules from plants that faced stressful conditions presented higher root H2O2 concentration and higher activity of catalase in roots as compared to the ones from plants that did not experience water shortage. Such physiological changes were associated with improvements in leaf area and shoot and root dry matter accumulation in propagules obtained from stressed plants. Our results suggest that root H2O2 concentration is a chemical signal associated with improved sugarcane performance under water deficit. Taken together, our findings bring a new perspective to the sugarcane production systems, in which plant acclimation can be explored for improving drought tolerance in rainfed areas.
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Claims 10
Claim · model-written summary
Water deficit reduced sugarcane propagule leaf gas exchange.
Not reportedComparator
Verbatim
e0“Leaf gas exchange was reduced under water deficit”
t0“sugarcane”
Claim · model-written summary
Propagules from water-deficit-exposed plants recovered CO2 assimilation faster after rehydration.
Verbatim
e0“the propagules from plants that experienced water deficit presented a faster recovery of CO2 assimilation and higher instantaneous carboxylation efficiency after rehydration as compared to the propagules from plants that never faced water deficit”
t0“sugarcane”
Claim · model-written summary
Propagules from water-deficit-exposed plants had higher instantaneous carboxylation efficiency after rehydration.
Verbatim
e0“the propagules from plants that experienced water deficit presented a faster recovery of CO2 assimilation and higher instantaneous carboxylation efficiency after rehydration as compared to the propagules from plants that never faced water deficit”
t0“sugarcane”
Claim · model-written summary
Propagules from stressed source plants had the highest leaf proline concentration under water deficit.
- Taxon
- sugarcanet0
- Treatment
- plants that faced water deficite0
- Outcome
- leaf proline concentratione0
- Direction
- higheste0
- Qualifier
- under water deficite0
Not reportedComparator
Verbatim
e0“The propagules from plants that faced water deficit also showed the highest leaf proline concentration under water deficit as well as higher leaf H2O2 concentration and leaf ascorbate peroxidase activity regardless of water regime.”
t0“sugarcane”
Claim · model-written summary
Propagules from stressed source plants had higher leaf H2O2 concentration across water regimes.
- Taxon
- sugarcanet0
- Treatment
- plants that faced water deficite0
- Outcome
- leaf H2O2 concentratione0
- Direction
- highere0
- Qualifier
- regardless of water regimee0
Not reportedComparator
Verbatim
e0“The propagules from plants that faced water deficit also showed the highest leaf proline concentration under water deficit as well as higher leaf H2O2 concentration and leaf ascorbate peroxidase activity regardless of water regime.”
t0“sugarcane”
Claim · model-written summary
Propagules from stressed source plants had higher leaf ascorbate peroxidase activity across water regimes.
- Taxon
- sugarcanet0
- Treatment
- plants that faced water deficite0
- Outcome
- leaf ascorbate peroxidase activitye0
- Direction
- highere0
- Qualifier
- regardless of water regimee0
Not reportedComparator
Verbatim
e0“The propagules from plants that faced water deficit also showed the highest leaf proline concentration under water deficit as well as higher leaf H2O2 concentration and leaf ascorbate peroxidase activity regardless of water regime.”
t0“sugarcane”
Claim · model-written summary
Under well-watered conditions, propagules from stressed plants had higher root H2O2 concentration.
Verbatim
e0“Under well-watered conditions, the propagules from plants that faced stressful conditions presented higher root H2O2 concentration and higher activity of catalase in roots as compared to the ones from plants that did not experience water shortage.”
t0“sugarcane”
Claim · model-written summary
Under well-watered conditions, propagules from stressed plants had higher catalase activity in roots.
Verbatim
e0“Under well-watered conditions, the propagules from plants that faced stressful conditions presented higher root H2O2 concentration and higher activity of catalase in roots as compared to the ones from plants that did not experience water shortage.”
t0“sugarcane”
Claim · model-written summary
Physiological changes in propagules from stressed plants were associated with improved leaf area and shoot and root dry matter accumulation.
Verbatim
e0“Such physiological changes were associated with improvements in leaf area and shoot and root dry matter accumulation in propagules obtained from stressed plants.”
t0“sugarcane”
Claim · model-written summary
The authors suggest root H2O2 concentration signals improved sugarcane performance under water deficit.
Verbatim
e0“root H2O2 concentration is a chemical signal associated with improved sugarcane performance under water deficit”
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