Abstract
Drought is one of the most important abiotic stresses and factors limiting the successful production of plant products worldwide and has adverse effects on plant growth and other metabolic processes. The role of exogenous individual or combined application of Silicon (Si) and Cycocel (CCC) (control, 3.6gL-1 Si, 210mgL-1 CCC, and 3.6gL-1 Si + 210mgL-1 CCC) on grain yield and some key physiological characteristics of wheat (Triticum aestivum L.) cv. Gascogen (drought-sensitive) and Aflak (drought-tolerant) was investigated under field water-stress conditions (100% and 40% field capacity). Drought stress caused a considerable reduction in biological yield, yield and yield components, relative water content and leaf water potential of both cultivars. Application of Si and CCC effectively improved these parameters in water-deficit treatments. Moreover, water-limited conditions markedly promoted the activities of key antioxidant enzymes including peroxidase, ascorbate peroxidase, catalase and superoxide dismutase as well as the levels of Malondialdehyde (MDA) and hydrogen peroxide (H2O2), while enhancing the accumulation of soluble sugars, potassium, magnesium and calcium in leaf tissues. Application of Si and CCC further enhanced the activities of the key antioxidant enzymes and accumulation of osmolytes, and decreased the levels of H2O2 and MDA in drought stressed plants; the positive effects of Si were greatest when it was applied with CCC. Synergistic effects of Si + CCC application on yield and physiological parameters were apparent compared with Si or CCC applied separately water-stress alleviation and yield improvement in the wheat cultivars by Si and CCC application was attributable to partly improved osmotic adjustment and antioxidant activity as well as to more favorable water status under stress conditions. Overall, Si and CCC application proved to have great potential in promoting grain yield of wheat in drought-prone areas.
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Claims 11
Claim · model-written summary
Drought reduced yield and yield components in both cultivars.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- Drought stresse0
- Outcome
- biological yield, yield and yield componentse0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress caused a considerable reduction in biological yield, yield and yield components, relative water content and leaf water potential of both cultivars”
t0“Wheat”
Claim · model-written summary
Drought reduced relative water content and leaf water potential.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Drought stresse0
- Outcome
- relative water content and leaf water potentiale0
- Direction
- reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress caused a considerable reduction in biological yield, yield and yield components, relative water content and leaf water potential of both cultivars”
t0“Wheat”
Claim · model-written summary
Si and CCC improved the drought-depressed yield and water-status parameters.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Si and CCCe0
- Outcome
- these parameterse0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of Si and CCC effectively improved these parameters in water-deficit treatments”
t0“Wheat”
Claim · model-written summary
Water limitation increased antioxidant enzyme activities.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- water-limited conditionse0
- Outcome
- activities of key antioxidant enzymes including peroxidase, ascorbate peroxidase, catalase and superoxide dismutasee0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water-limited conditions markedly promoted the activities of key antioxidant enzymes including peroxidase, ascorbate peroxidase, catalase and superoxide dismutase”
t0“Wheat”
Claim · model-written summary
Water limitation increased MDA and hydrogen peroxide levels.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- water-limited conditionse0
- Outcome
- levels of Malondialdehyde (MDA) and hydrogen peroxide (H2O2)e0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water-limited conditions markedly promoted the activities of key antioxidant enzymes including peroxidase, ascorbate peroxidase, catalase and superoxide dismutase as well as the levels of Malondialdehyde (MDA) and hydrogen peroxide (H2O2)”
t0“Wheat”
Claim · model-written summary
Water limitation increased leaf soluble sugars, potassium and magnesium.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- leaf tissuese0
- Outcome
- accumulation of soluble sugars, potassium, magnesiume0
- Direction
- enhancinge0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“enhancing the accumulation of soluble sugars, potassium, magnesium and calcium in leaf tissues”
t0“Wheat”
Claim · model-written summary
Water limitation increased leaf calcium.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- calcium in leaf tissuese0
- Direction
- enhancinge0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“enhancing the accumulation of soluble sugars, potassium, magnesium and calcium in leaf tissues”
t0“Wheat”
Claim · model-written summary
Si and CCC further increased antioxidant activities and osmolyte accumulation under drought.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Si and CCCe0
- Outcome
- activities of the key antioxidant enzymes and accumulation of osmolytese0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of Si and CCC further enhanced the activities of the key antioxidant enzymes and accumulation of osmolytes”
t0“Wheat”
Claim · model-written summary
Si and CCC decreased hydrogen peroxide and MDA under drought.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- levels of H2O2 and MDAe0
- Direction
- decreasede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“decreased the levels of H2O2 and MDA in drought stressed plants”
t0“Wheat”
Claim · model-written summary
Combined Si and CCC had synergistic yield and physiological effects compared with individual applications.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Si + CCC applicatione0
- Outcome
- yield and physiological parameterse0
- Direction
- Synergistice0
- Comparator
- Si or CCC applied separatelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Synergistic effects of Si + CCC application on yield and physiological parameters were apparent compared with Si or CCC applied separately”
t0“Wheat”
Claim · model-written summary
The authors attributed drought alleviation to osmotic adjustment, antioxidant activity and water status.
- Taxon
- wheatTriticum aestivume0
- Treatment
- Si and CCC applicatione0
- Outcome
- water-stress alleviation and yield improvemente0
- Qualifier
- improved osmotic adjustment and antioxidant activitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“water-stress alleviation and yield improvement in the wheat cultivars by Si and CCC application was attributable to partly improved osmotic adjustment and antioxidant activity as well as to more favorable water status under stress conditions”
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