Abstract
water drought stress is a major environmental stress limiting wheat productivity worldwide. The aim of this study was to assess and compare various stress tolerance indices in order to identify the most drought-tolerant wheat genotypes for the future wheat breeding programs. For this purpose, 28 bread wheat genotypes (7 parents and their 21 hybrids) were evaluated in two separate experiments under water-deficit (two irrigations) and well-watered (five irrigations). The drought tolerance indices were calculated based on grain yield under normal (Yp) and stress (Ys) conditions. Highly significant differences were detected among the tested genotypes for all the studied traits, under normal and water stress conditions. Water-deficit stress substantially declined the means of all the studied traits. Water stress caused reductions in days to 50 % heading, plant height, spike length, number of kernels / spike, 1000-kernel weight and grain yield / plant traits by 5.19, 11.15, 16.39, 16.90, 10.67 and 8.98 % respectively. Based on tolerance index (TO L) and stress tolerance index (SSI), the two parents Misr 2 and Line 117, as well as, the crosses Sids14 x Sakha 95, Sids14 x Line 117 and Misr 2 x Line 136 were identified as the suitable genotypes under water stress conditions due to lower values of these indices. Moreover, these genotypes expressed the highest yield under stress conditions. Therefore, the parental genotypes Sids 14 and Sakha 95, as well as the hybrids Sakha 95 x Misr 2 and Sakha 95 x line 115, were identified as highly drought-tolerant genotypes. Accordingly, these genotypes could be used in the future wheat breeding for improving grain yield under water deficit conditions.
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Claims 14
Claim · model-written summary
Water stress reduced days to 50 % heading by 5.19% relative to well-watered plants.
- Taxon
- bread wheat
Triticum aestivume0 - Treatment
- water-deficit (two irrigations)e0
- Outcome
- days to 50 % headinge1
- Direction
- reductionse1
- Value
- 5.19e1
- Comparator
- well-watered (five irrigations)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 bread wheat genotypes (7 parents and their 21 hybrids) were evaluated in two separate experiments under water-deficit (two irrigations) and well-watered (five irrigations)”
e1“Water stress caused reductions in days to 50 % heading, plant height, spike length, number of kernels / spike, 1000-kernel weight and grain yield / plant traits by 5.19, 11.15, 16.39, 16.90, 10.67 and 8.98 % respectively”
Claim · model-written summary
Water stress reduced plant height by 11.15% relative to well-watered plants.
- Taxon
- bread wheatTriticum aestivume0
- Treatment
- water-deficit (two irrigations)e0
- Outcome
- plant heighte1
- Direction
- reductionse1
- Value
- 11.15e1
- Comparator
- well-watered (five irrigations)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 bread wheat genotypes (7 parents and their 21 hybrids) were evaluated in two separate experiments under water-deficit (two irrigations) and well-watered (five irrigations)”
e1“Water stress caused reductions in days to 50 % heading, plant height, spike length, number of kernels / spike, 1000-kernel weight and grain yield / plant traits by 5.19, 11.15, 16.39, 16.90, 10.67 and 8.98 % respectively”
Claim · model-written summary
Water stress reduced spike length by 16.39% relative to well-watered plants.
- Taxon
- bread wheatTriticum aestivume0
- Treatment
- water-deficit (two irrigations)e0
- Outcome
- spike lengthe1
- Direction
- reductionse1
- Value
- 16.39e1
- Comparator
- well-watered (five irrigations)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 bread wheat genotypes (7 parents and their 21 hybrids) were evaluated in two separate experiments under water-deficit (two irrigations) and well-watered (five irrigations)”
e1“Water stress caused reductions in days to 50 % heading, plant height, spike length, number of kernels / spike, 1000-kernel weight and grain yield / plant traits by 5.19, 11.15, 16.39, 16.90, 10.67 and 8.98 % respectively”
Claim · model-written summary
Water stress reduced number of kernels / spike by 16.90% relative to well-watered plants.
- Taxon
- bread wheatTriticum aestivume0
- Treatment
- water-deficit (two irrigations)e0
- Outcome
- number of kernels / spikee1
- Direction
- reductionse1
- Value
- 16.90e1
- Comparator
- well-watered (five irrigations)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 bread wheat genotypes (7 parents and their 21 hybrids) were evaluated in two separate experiments under water-deficit (two irrigations) and well-watered (five irrigations)”
e1“Water stress caused reductions in days to 50 % heading, plant height, spike length, number of kernels / spike, 1000-kernel weight and grain yield / plant traits by 5.19, 11.15, 16.39, 16.90, 10.67 and 8.98 % respectively”
Claim · model-written summary
Water stress reduced 1000-kernel weight by 10.67% relative to well-watered plants.
- Taxon
- bread wheatTriticum aestivume0
- Treatment
- water-deficit (two irrigations)e0
- Outcome
- 1000-kernel weighte1
- Direction
- reductionse1
- Value
- 10.67e1
- Comparator
- well-watered (five irrigations)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 bread wheat genotypes (7 parents and their 21 hybrids) were evaluated in two separate experiments under water-deficit (two irrigations) and well-watered (five irrigations)”
e1“Water stress caused reductions in days to 50 % heading, plant height, spike length, number of kernels / spike, 1000-kernel weight and grain yield / plant traits by 5.19, 11.15, 16.39, 16.90, 10.67 and 8.98 % respectively”
Claim · model-written summary
Water stress reduced grain yield / plant by 8.98% relative to well-watered plants.
- Taxon
- bread wheatTriticum aestivume0
- Treatment
- water-deficit (two irrigations)e0
- Outcome
- grain yield / plante1
- Direction
- reductionse1
- Value
- 8.98e1
- Comparator
- well-watered (five irrigations)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 bread wheat genotypes (7 parents and their 21 hybrids) were evaluated in two separate experiments under water-deficit (two irrigations) and well-watered (five irrigations)”
e1“Water stress caused reductions in days to 50 % heading, plant height, spike length, number of kernels / spike, 1000-kernel weight and grain yield / plant traits by 5.19, 11.15, 16.39, 16.90, 10.67 and 8.98 % respectively”
Claim · model-written summary
Parents Misr 2 and Line 117 were identified as suitable under water stress by low TOL and SSI values.
- Taxon
- bread wheatTriticum aestivume0
- Material
- Misr 2 and Line 117e2
- Treatment
- water stress conditionse2
- Outcome
- suitable genotypese2
- Qualifier
- due to lower values of these indicese2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Based on tolerance index (TO L) and stress tolerance index (SSI), the two parents Misr 2 and Line 117, as well as, the crosses Sids14 x Sakha 95, Sids14 x Line 117 and Misr 2 x Line 136 were identified as the suitable genotypes under water stress conditions due to lower values of these indices”
e0“28 bread wheat genotypes (7 parents and their 21 hybrids) were evaluated in two separate experiments under water-deficit (two irrigations) and well-watered (five irrigations)”
Claim · model-written summary
Crosses Sids14 x Sakha 95, Sids14 x Line 117 and Misr 2 x Line 136 were identified as suitable under water stress by low TOL and SSI values.
- Taxon
- bread wheatTriticum aestivume0
- Material
- Sids14 x Sakha 95, Sids14 x Line 117 and Misr 2 x Line 136e2
- Treatment
- water stress conditionse2
- Outcome
- suitable genotypese2
- Qualifier
- due to lower values of these indicese2
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Based on tolerance index (TO L) and stress tolerance index (SSI), the two parents Misr 2 and Line 117, as well as, the crosses Sids14 x Sakha 95, Sids14 x Line 117 and Misr 2 x Line 136 were identified as the suitable genotypes under water stress conditions due to lower values of these indices”
e0“28 bread wheat genotypes (7 parents and their 21 hybrids) were evaluated in two separate experiments under water-deficit (two irrigations) and well-watered (five irrigations)”
Claim · model-written summary
The genotypes identified as suitable expressed the highest yield under stress conditions.
- Taxon
- bread wheatTriticum aestivume0
- Material
- these genotypese3
- Treatment
- stress conditionse3
- Outcome
- yielde3
- Direction
- higheste3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“Moreover, these genotypes expressed the highest yield under stress conditions”
e0“28 bread wheat genotypes (7 parents and their 21 hybrids) were evaluated in two separate experiments under water-deficit (two irrigations) and well-watered (five irrigations)”
Claim · model-written summary
Parental genotypes Sids 14 and Sakha 95 were identified as highly drought-tolerant.
- Taxon
- bread wheatTriticum aestivume0
- Material
- Sids 14 and Sakha 95e6
- Outcome
- highly drought-tolerant genotypese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 bread wheat genotypes (7 parents and their 21 hybrids) were evaluated in two separate experiments under water-deficit (two irrigations) and well-watered (five irrigations)”
e6“the parental genotypes Sids 14 and Sakha 95, as well as the hybrids Sakha 95 x Misr 2 and Sakha 95 x line 115, were identified as highly drought-tolerant genotypes”
Claim · model-written summary
Hybrids Sakha 95 x Misr 2 and Sakha 95 x line 115 were identified as highly drought-tolerant.
- Taxon
- bread wheatTriticum aestivume0
- Material
- Sakha 95 x Misr 2 and Sakha 95 x line 115e6
- Outcome
- highly drought-tolerant genotypese6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 bread wheat genotypes (7 parents and their 21 hybrids) were evaluated in two separate experiments under water-deficit (two irrigations) and well-watered (five irrigations)”
e6“the parental genotypes Sids 14 and Sakha 95, as well as the hybrids Sakha 95 x Misr 2 and Sakha 95 x line 115, were identified as highly drought-tolerant genotypes”
Claim · model-written summary
These genotypes could be used in wheat breeding to improve grain yield under water deficit.
- Taxon
- wheatTriticum aestivume7
- Outcome
- improving grain yield under water deficit conditionse7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e7“these genotypes could be used in the future wheat breeding for improving grain yield under water deficit conditions”
Claim · model-written summary
Highly significant differences were detected among the tested genotypes for all the studied traits under normal and water stress.
- Taxon
- bread wheatTriticum aestivume0
- Outcome
- Highly significant differences were detected among the tested genotypese4
- Qualifier
- under normal and water stress conditionse4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 bread wheat genotypes (7 parents and their 21 hybrids) were evaluated in two separate experiments under water-deficit (two irrigations) and well-watered (five irrigations)”
e4“Highly significant differences were detected among the tested genotypes for all the studied traits, under normal and water stress conditions”
Claim · model-written summary
Water-deficit stress declined the means of all the studied traits.
- Taxon
- bread wheatTriticum aestivume0
- Treatment
- Water-deficit stresse5
- Outcome
- the means of all the studied traitse5
- Direction
- declinede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“28 bread wheat genotypes (7 parents and their 21 hybrids) were evaluated in two separate experiments under water-deficit (two irrigations) and well-watered (five irrigations)”
e5“Water-deficit stress substantially declined the means of all the studied traits”
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