Abstract
Water shortage is the main constraint limiting crop productivity across the globe especially when it occurs at reproductive and grain filling stages. This study was conducted to monitor the mechanisms of drought resistance, during reproductive stages (booting, heading anthesis and post-anthesis stages) by monitoring the stay green character, water use efficiency, grain filling rate, grain filling duration, grain yield and harvest index. Seeds of wheat cultivars C-591, Chakwal-50, Dharabi-2011, BARS2009, Uqab-2000, Sehr-2006, Shafaq-2006, Faisalabad-2008, Lasani-2008 and Mairaj-2008 were sown in 10 kg soil filled pots on November 25, 2011. The drought stress was applied at the respective reproductive stage, which continued till maturity. Controlled plants were well-watered throughout the crop ontogeny. Pots were maintained at 70% water holding capacity (WHC; well watered) till booting stage and then managed drought stress was induced as per treatment maintaining 35% WHC (drought stress). Drought stress at all the stages significantly influenced the crop performance in all the tested cultivars. Severity of drought was more when it was imposed at booting and heading stages while was less devastating when imposed at anthesis and grain filling stages. Cultivars Chakwal-50 and Mairaj-2008 showed more stay gray character and took longer duration for grain filling, which resulted in the maintenance of higher grain weight and grain number per spike, grain yield and water use efficiency under stress conditions. In drought sensitive cultivars (BARS-2009, Uqab-2000), the drought increased the grain filling rate, while grain filling duration was substantially decreased. To conclude, stay green character, grain filling rate and duration under drought stress may be used as selection criteria for developing and/or screening wheat cultivars for drought resistance at reproductive stages. © 2013 Friends Science Publishers
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Claims 9
Claim · model-written summary
Drought stress significantly influenced performance of all tested wheat cultivars.
- Taxon
- wheat
Triticum aestivumt0 - Treatment
- Drought stresse0
- Outcome
- crop performancee0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“Drought stress at all the stages significantly influenced the crop performance in all the tested cultivars”
Claim · model-written summary
Drought was more severe at booting and heading than at anthesis and grain filling.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- booting and heading stagese0
- Outcome
- Severity of droughte0
- Direction
- moree0
- Comparator
- anthesis and grain filling stagese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“Severity of drought was more when it was imposed at booting and heading stages while was less devastating when imposed at anthesis and grain filling stages”
Claim · model-written summary
Chakwal-50 and Mairaj-2008 showed more stay gray character under stress.
- Taxon
- wheatTriticum aestivumt0
- Material
- Chakwal-50 and Mairaj-2008e0
- Outcome
- stay gray charactere0
- Direction
- moree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“Cultivars Chakwal-50 and Mairaj-2008 showed more stay gray character and took longer duration for grain filling”
Claim · model-written summary
Chakwal-50 and Mairaj-2008 had longer grain filling duration under stress.
- Taxon
- wheatTriticum aestivumt0
- Material
- Chakwal-50 and Mairaj-2008e0
- Outcome
- duration for grain fillinge0
- Direction
- longere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“Cultivars Chakwal-50 and Mairaj-2008 showed more stay gray character and took longer duration for grain filling”
Claim · model-written summary
Chakwal-50 and Mairaj-2008 maintained higher grain weight and grain number per spike under stress.
- Taxon
- wheatTriticum aestivumt0
- Material
- Chakwal-50 and Mairaj-2008e1
- Outcome
- grain weight and grain number per spikee0
- Direction
- highere0
- Qualifier
- under stress conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“maintenance of higher grain weight and grain number per spike, grain yield and water use efficiency under stress conditions”
e1“Cultivars Chakwal-50 and Mairaj-2008”
Claim · model-written summary
Chakwal-50 and Mairaj-2008 maintained higher grain yield and water use efficiency under stress.
- Taxon
- wheatTriticum aestivumt0
- Material
- Chakwal-50 and Mairaj-2008e1
- Outcome
- grain yield and water use efficiencye0
- Direction
- highere0
- Qualifier
- under stress conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“maintenance of higher grain weight and grain number per spike, grain yield and water use efficiency under stress conditions”
e1“Cultivars Chakwal-50 and Mairaj-2008”
Claim · model-written summary
Drought increased grain filling rate in BARS-2009 and Uqab-2000.
- Taxon
- wheatTriticum aestivumt0
- Material
- BARS-2009, Uqab-2000e0
- Treatment
- droughte0
- Outcome
- grain filling ratee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“In drought sensitive cultivars (BARS-2009, Uqab-2000), the drought increased the grain filling rate”
Claim · model-written summary
Drought substantially decreased grain filling duration in BARS-2009 and Uqab-2000.
- Taxon
- wheatTriticum aestivumt0
- Material
- BARS-2009, Uqab-2000e0
- Treatment
- droughte0
- Outcome
- grain filling duratione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“wheat”
e0“In drought sensitive cultivars (BARS-2009, Uqab-2000), the drought increased the grain filling rate, while grain filling duration was substantially decreased”
Claim · model-written summary
Stay green character, grain filling rate and duration under drought may serve as selection criteria for wheat drought resistance.
- Taxon
- wheatTriticum aestivume0
- Outcome
- selection criteria for developing and/or screening wheat cultivars for drought resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stay green character, grain filling rate and duration under drought stress may be used as selection criteria for developing and/or screening wheat cultivars for drought resistance at reproductive stages”
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