Abstract
Among abiotic stresses, water stress is the most environmental constraint for crops, especially in the arid and semi-arid tracts of the world. It reduces growth and development that may cause diverse disturbance in physiological, biochemical and structural integrity of plants. In this view, we assess here drought-induced changes in Cenchrus ciliaris and Digitaria commutata. Seedlings were grown under two watering regimes for three months. Water stress significantly restricted the photosynthesis and growth activity of both species. Interestingly, water deficit led to a slight decrease of relative water content (RWC). The maximal quantum yield of PSII photochemistry (Fv/Fm) remained unchanged. However, in light-adapted leaves, water deficit reduced the efficiency of excitation energy capture by open PSII reaction centers (Fv’/Fm’) and the quantum efficiency of the photosystem II (ΦPSII), increased the non-photochemical quenching (qN) and showed no effects on the photochemical quenching (qP). These results suggest that C. ciliaris and D. commutatashowed a better aptitude to preserve the PSII functional integrity, thereforea relatively good tolerance to water deficit.
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Claims 8
Claim · model-written summary
Water stress significantly restricted photosynthesis and growth of both species.
- Taxon
- Cenchrus ciliaris and Digitaria commutatae0
- Treatment
- Water stresse1
- Outcome
- photosynthesis and growth activitye1
- Direction
- restrictede1
Not reportedComparator
Verbatim
e0“In this view, we assess here drought-induced changes in Cenchrus ciliaris and Digitaria commutata”
e1“Water stress significantly restricted the photosynthesis and growth activity of both species”
Claim · model-written summary
Water deficit slightly decreased relative water content.
- Taxon
- Cenchrus ciliaris and Digitaria commutatae0
- Treatment
- water deficite2
- Outcome
- relative water contente2
- Direction
- decreasee2
- Qualifier
- slighte2
Not reportedComparator
Verbatim
e0“In this view, we assess here drought-induced changes in Cenchrus ciliaris and Digitaria commutata”
e2“water deficit led to a slight decrease of relative water content (RWC)”
Claim · model-written summary
The maximal quantum yield of PSII photochemistry (Fv/Fm) was unchanged under water stress.
- Taxon
- Cenchrus ciliaris and Digitaria commutatae0
- Treatment
- Water stresse1
- Outcome
- maximal quantum yield of PSII photochemistry (Fv/Fm)e3
- Direction
- remained unchangede3
Not reportedComparator
Verbatim
e0“In this view, we assess here drought-induced changes in Cenchrus ciliaris and Digitaria commutata”
e1“Water stress significantly restricted the photosynthesis and growth activity of both species”
e3“The maximal quantum yield of PSII photochemistry (Fv/Fm) remained unchanged”
Claim · model-written summary
Water deficit reduced the efficiency of excitation energy capture by open PSII reaction centers (Fv’/Fm’).
- Taxon
- Cenchrus ciliaris and Digitaria commutatae0
- Treatment
- water deficite4
- Outcome
- efficiency of excitation energy capture by open PSII reaction centers (Fv’/Fm’)e4
- Direction
- reducede4
Not reportedComparator
Verbatim
e0“In this view, we assess here drought-induced changes in Cenchrus ciliaris and Digitaria commutata”
e4“water deficit reduced the efficiency of excitation energy capture by open PSII reaction centers (Fv’/Fm’) and the quantum efficiency of the photosystem II (ΦPSII)”
Claim · model-written summary
Water deficit reduced the quantum efficiency of photosystem II (ΦPSII).
- Taxon
- Cenchrus ciliaris and Digitaria commutatae0
- Treatment
- water deficite4
- Outcome
- quantum efficiency of the photosystem II (ΦPSII)e4
- Direction
- reducede4
Not reportedComparator
Verbatim
e0“In this view, we assess here drought-induced changes in Cenchrus ciliaris and Digitaria commutata”
e4“water deficit reduced the efficiency of excitation energy capture by open PSII reaction centers (Fv’/Fm’) and the quantum efficiency of the photosystem II (ΦPSII)”
Claim · model-written summary
Water deficit increased non-photochemical quenching (qN).
- Taxon
- Cenchrus ciliaris and Digitaria commutatae0
- Treatment
- water deficite4
- Outcome
- non-photochemical quenching (qN)e5
- Direction
- increasede5
Not reportedComparator
Verbatim
e0“In this view, we assess here drought-induced changes in Cenchrus ciliaris and Digitaria commutata”
e4“water deficit reduced the efficiency of excitation energy capture by open PSII reaction centers (Fv’/Fm’) and the quantum efficiency of the photosystem II (ΦPSII)”
e5“increased the non-photochemical quenching (qN)”
Claim · model-written summary
Water deficit had no effect on photochemical quenching (qP).
- Taxon
- Cenchrus ciliaris and Digitaria commutatae0
- Treatment
- water deficite4
- Outcome
- photochemical quenching (qP)e6
- Direction
- showed no effectse6
Not reportedComparator
Verbatim
e0“In this view, we assess here drought-induced changes in Cenchrus ciliaris and Digitaria commutata”
e4“water deficit reduced the efficiency of excitation energy capture by open PSII reaction centers (Fv’/Fm’) and the quantum efficiency of the photosystem II (ΦPSII)”
e6“showed no effects on the photochemical quenching (qP)”
Claim · model-written summary
Both species showed a relatively good tolerance to water deficit, through better preservation of PSII functional integrity.
Verbatim
e7“C. ciliaris and D. commutatashowed a better aptitude to preserve the PSII functional integrity, thereforea relatively good tolerance to water deficit”