Abstract
To evaluate the response of some selected wheat cultivars to silicon application at different growth stages under drought stress, an experiment was carried out in the greenhouse of College of Agriculture, Shiraz University, Iran, during 2012 using a completely randomized factorial design with four replications. Experimental treatments included drought stress (100% F.C. as control and 40% F.C. as drought) and foliar application of 6 mM sodium silicate (control, application at mid tillering stage, at anthesis stage, and application at tillering + anthesis stages) and wheat cultivars (Sirvan and Chamran, relatively drought-tolerant, and Shiraz and Marvdasht, drought-sensitive cultivars). Drought stress significantly reduced chlorophyll content, leaf area, relative water content, grains per spike, 1000-grain weight, grain yield and biomass of all wheat cultivars. Furthermore, drought stress increased electrolyte leakage of the flag leaves of all cultivars. In contrast, foliar-applied silicon significantly increased these parameters and reduced electrolyte leakage. Furthermore, highest positive influence of silicon application was observed at combined use of silicon both at the tillering + anthesis stages in wheat plants under both stress and non-stress conditions. Significant differences were found in physiological responses among wheat cultivars. The drought tolerant cultivars (Sirvan and Chamran) had significantly higher growth and yield than those of drought sensitive cvs. Shiraz and Marvdasht under drought stress. In conclusion, foliar application of silicon especially at the tillering + anthesis stages was very effective in promoting resistance in wheat plants to drought conditions by maintaining cellular membrane integrity and relative water content, and increasing chlorophyll content.
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Claims 10
Claim · model-written summary
Drought reduced chlorophyll content, leaf area and relative water content across wheat cultivars.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- Drought stresse0
- Outcome
- chlorophyll content, leaf area, relative water contente0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress significantly reduced chlorophyll content, leaf area, relative water content, grains per spike, 1000-grain weight, grain yield and biomass of all wheat cultivars.”
t0“wheat cultivars”
Claim · model-written summary
Drought reduced grains per spike, 1000-grain weight and grain yield across wheat cultivars.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Drought stresse0
- Outcome
- grains per spike, 1000-grain weight, grain yielde0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress significantly reduced chlorophyll content, leaf area, relative water content, grains per spike, 1000-grain weight, grain yield and biomass of all wheat cultivars.”
t0“wheat cultivars”
Claim · model-written summary
Drought reduced wheat biomass.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- Drought stresse0
- Outcome
- biomasse0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Drought stress significantly reduced chlorophyll content, leaf area, relative water content, grains per spike, 1000-grain weight, grain yield and biomass of all wheat cultivars.”
t0“wheat cultivars”
Claim · model-written summary
Drought increased electrolyte leakage in flag leaves of all wheat cultivars.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- flag leavese0
- Treatment
- drought stresse0
- Outcome
- electrolyte leakagee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought stress increased electrolyte leakage of the flag leaves of all cultivars.”
t0“wheat cultivars”
Claim · model-written summary
Foliar silicon increased the previously listed wheat growth, physiology and yield parameters.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- foliar-applied silicone0
- Outcome
- chlorophyll content, leaf area, relative water contente1
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar-applied silicon significantly increased these parameters and reduced electrolyte leakage.”
e1“Drought stress significantly reduced chlorophyll content, leaf area, relative water content, grains per spike, 1000-grain weight, grain yield and biomass of all wheat cultivars.”
t0“wheat cultivars”
Claim · model-written summary
Foliar silicon reduced wheat electrolyte leakage.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- foliar-applied silicone0
- Outcome
- electrolyte leakagee0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar-applied silicon significantly increased these parameters and reduced electrolyte leakage.”
t0“wheat cultivars”
Claim · model-written summary
Silicon applied at tillering and anthesis had the highest positive influence under stress and non-stress conditions.
- Taxon
- wheatTriticum aestivume0
- Treatment
- combined use of silicon both at the tillering + anthesis stagese0
- Outcome
- highest positive influencee0
- Direction
- higheste0
- Qualifier
- under both stress and non-stress conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“highest positive influence of silicon application was observed at combined use of silicon both at the tillering + anthesis stages in wheat plants under both stress and non-stress conditions.”
t0“wheat cultivars”
Claim · model-written summary
Physiological responses differed significantly among wheat cultivars.
- Taxon
- wheatTriticum aestivume0
- Outcome
- physiological responsese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Significant differences were found in physiological responses among wheat cultivars.”
Claim · model-written summary
Drought tolerant wheat cultivars had higher growth and yield than drought sensitive cultivars under drought.
- Taxon
- wheatTriticum aestivumt0
- Material
- Sirvan and Chamrane0
- Outcome
- growth and yielde0
- Direction
- highere0
- Qualifier
- under drought stresse0
- Comparator
- Shiraz and Marvdashte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The drought tolerant cultivars (Sirvan and Chamran) had significantly higher growth and yield than those of drought sensitive cvs. Shiraz and Marvdasht under drought stress.”
t0“wheat cultivars”
Claim · model-written summary
The authors conclude silicon at tillering and anthesis promotes wheat drought resistance by maintaining membrane integrity, water content and chlorophyll.
- Taxon
- wheatTriticum aestivume0
- Treatment
- foliar application of silicon especially at the tillering + anthesis stagese0
- Outcome
- resistancee0
- Qualifier
- maintaining cellular membrane integrity and relative water content, and increasing chlorophyll contente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar application of silicon especially at the tillering + anthesis stages was very effective in promoting resistance in wheat plants to drought conditions by maintaining cellular membrane integrity and relative water content, and increasing chlorophyll content.”
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