Abstract
The present study was carried out to study the performance of durum and bread wheat genotypes in relation to grain filling process, under water and heat stresses. The experiment was laid out in split plot design with three replicates at Fuka Research Station, Faculty of Desert and Environmental Agriculture, Matrouh Governorate (North West Coast of Egypt) in 2011/2012 and 2012/2013 winter seasons. Environmental conditions were considered as the main plots and included four environments (normal, drought, heat, heat and drought conditions). Sub plots were assigned to fourteen durum and bread wheat genotypes. The results revealed significant variations between studied environments for number of grains per spike (NGS), one-hundred grain weight (HGW) and grain yield (GY). However, number of fertile tiller (NFT) was insignificantly influenced by environments. Wheat varieties significantly differed for the studied four traits, whereas, the environment x variety interaction significantly influenced NFT and GY only in both seasons. Grain yield, as an average of the two seasons, was reduced by 26.03, 43.07 and 58.28 percentages at drought, heat and combined drought and heat, respectively, compared to normal conditions. All wheat genotypes suffered with application of combined drought and heat stresses in both seasons. Wheat genotypes varied in their response to heat stress conditions where Beni suef 3 and Sohag 3 (durum wheat) and Sids 1 and Giza 168 (bread wheat) showed comparatively higher tolerance to heat stress. In addition, stability analysis revealed a differential response of wheat varieties (b value) to individual or combined drought and heat stress.
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Claims 9
Claim · model-written summary
Environments significantly varied in grains per spike, hundred grain weight and grain yield.
Verbatim
e0“significant variations between studied environments for number of grains per spike (NGS), one-hundred grain weight (HGW) and grain yield (GY)”
Claim · model-written summary
Environment did not significantly influence fertile tiller number.
- Outcome
- number of fertile tiller (NFT)e0
Not reportedTaxon
Verbatim
e0“number of fertile tiller (NFT) was insignificantly influenced by environments”
Claim · model-written summary
Wheat varieties significantly differed for the four studied traits.
- Taxon
- Wheat
Triticum aestivume0 - Outcome
- studied four traitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Wheat varieties significantly differed for the studied four traits”
Claim · model-written summary
Environment by variety interaction significantly influenced fertile tiller number and grain yield in both seasons.
Not reportedTaxonDirection
Verbatim
e0“the environment x variety interaction significantly influenced NFT and GY only in both seasons”
Claim · model-written summary
Drought reduced wheat grain yield by 26.03% versus normal conditions.
Not reportedTaxon
Verbatim
e0“Grain yield, as an average of the two seasons, was reduced by 26.03, 43.07 and 58.28 percentages at drought, heat and combined drought and heat, respectively, compared to normal conditions.”
Claim · model-written summary
Heat reduced wheat grain yield by 43.07% versus normal conditions.
Not reportedTaxon
Verbatim
e0“Grain yield, as an average of the two seasons, was reduced by 26.03, 43.07 and 58.28 percentages at drought, heat and combined drought and heat, respectively, compared to normal conditions.”
Claim · model-written summary
Combined drought and heat reduced wheat grain yield by 58.28% versus normal conditions.
- Treatment
- combined drought and heate0
- Outcome
- Grain yielde0
- Direction
- reducede0
- Value
- 58.28e0
- Comparator
- normal conditionse0
Not reportedTaxon
Verbatim
e0“Grain yield, as an average of the two seasons, was reduced by 26.03, 43.07 and 58.28 percentages at drought, heat and combined drought and heat, respectively, compared to normal conditions.”
Claim · model-written summary
Beni suef 3, Sohag 3, Sids 1 and Giza 168 had comparatively higher heat tolerance.
- Taxon
- wheatTriticum aestivume0
- Material
- Beni suef 3 and Sohag 3e0
- Outcome
- tolerance to heat stresse0
- Direction
- highere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Beni suef 3 and Sohag 3 (durum wheat) and Sids 1 and Giza 168 (bread wheat) showed comparatively higher tolerance to heat stress.”
Claim · model-written summary
Stability analysis found differing genotype responses to individual or combined drought and heat stress.
- Taxon
- wheatTriticum aestivume0
- Treatment
- individual or combined drought and heat stresse0
- Outcome
- differential responsee0
- Direction
- differentiale0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stability analysis revealed a differential response of wheat varieties (b value) to individual or combined drought and heat stress”
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