Abstract
Drought is a world-wide spread problem adversely affecting bread wheat production in rainfed agro-ecosystems. Development and identification of efficient selection criteria for developing drought tolerant wheat varieties with stable and high yield potential is of paramount importance. This study was carried out to evaluate 24 indices for selecting the best high yielding and drought tolerant cultivars, among 40 bread wheat genotypes, under four levels of stress intensities: no stress, mild (0.25, 0.35) and severe (0.57). The mean productivity (MP), modified stress tolerance index (MSTIk), superiority index (Pi), mean relative performance (MRP), relative efficiency index (REI), geometric mean productivity (GMP), stress tolerance index (STI), harmonic mean (HARM) and relative decrease in yield (RDY) showed a high power of discrimination among genotypes, and expressed significant correlations with yields under both stress and non-stressed conditions at all stress intensities. This group of indices was capable to select the highest mean yield associated with the least mean variance at 20 % selection pressure. However, as the stress intensity became greater (>35 %), the efficiency of these indices decreased, especially at high stress intensity (57%), where only Pi and MP were still able to target the highest performances. MRP, REI, GMP, RDY and STI can be used interchangeably. Based on GGE analysis, the best performing genotypes were AUS30355, followed by Gladius, Amir-2 and AUS30354 that showed high yield and stability across all the environments. These genotypes are recommended for direct release and/or for use as parents in the breeding programs.
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Claims 11
Claim · model-written summary
The listed drought indices showed high power of discrimination among genotypes.
- Taxon
- bread wheat
Triticum aestivumt0 - Outcome
- high power of discrimination among genotypese0
- Qualifier
- at all stress intensitiese0
- Comparator
- stress and non-stressed conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean productivity (MP), modified stress tolerance index (MSTIk), superiority index (Pi), mean relative performance (MRP), relative efficiency index (REI), geometric mean productivity (GMP), stress tolerance index (STI), harmonic mean (HARM) and relative decrease in yield (RDY) showed a high power of discrimination among genotypes, and expressed significant correlations with yields under both stress and non-stressed conditions at all stress intensities”
t0“bread wheat”
Claim · model-written summary
The listed drought indices showed significant correlations with yields under both stress and non-stressed conditions.
- Taxon
- bread wheatTriticum aestivumt0
- Outcome
- significant correlations with yields under both stress and non-stressed conditionse0
- Qualifier
- at all stress intensitiese0
- Comparator
- stress and non-stressed conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mean productivity (MP), modified stress tolerance index (MSTIk), superiority index (Pi), mean relative performance (MRP), relative efficiency index (REI), geometric mean productivity (GMP), stress tolerance index (STI), harmonic mean (HARM) and relative decrease in yield (RDY) showed a high power of discrimination among genotypes, and expressed significant correlations with yields under both stress and non-stressed conditions at all stress intensities”
t0“bread wheat”
Claim · model-written summary
These indices selected high mean yield with low mean variance at 20% selection pressure.
- Taxon
- bread wheatTriticum aestivumt0
- Outcome
- highest mean yield associated with the least mean variancee0
- Value
- 20 %e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This group of indices was capable to select the highest mean yield associated with the least mean variance at 20 % selection pressure”
t0“bread wheat”
Claim · model-written summary
Index efficiency decreased as drought stress exceeded 35%.
- Taxon
- bread wheatTriticum aestivumt0
- Outcome
- efficiency of these indicese0
- Direction
- decreasede0
- Value
- >35 %e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as the stress intensity became greater (>35 %), the efficiency of these indices decreased”
t0“bread wheat”
Claim · model-written summary
At 57% stress, only Pi and MP targeted the highest performances.
- Taxon
- bread wheatTriticum aestivumt0
- Outcome
- target the highest performancese0
- Value
- 57%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“high stress intensity (57%), where only Pi and MP were still able to target the highest performances”
t0“bread wheat”
Claim · model-written summary
MRP, REI, GMP, RDY and STI were interchangeable.
- Taxon
- bread wheatTriticum aestivumt0
- Outcome
- can be used interchangeablye0
- Comparator
- MRP, REI, GMP, RDY and STIe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“MRP, REI, GMP, RDY and STI can be used interchangeably”
t0“bread wheat”
Claim · model-written summary
AUS30355 was among the best performers for yield and stability.
- Taxon
- bread wheatTriticum aestivumt0
- Material
- AUS30355e0
- Outcome
- high yield and stabilitye0
- Setting
- all the environmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the best performing genotypes were AUS30355, followed by Gladius, Amir-2 and AUS30354 that showed high yield and stability across all the environments”
t0“bread wheat”
Claim · model-written summary
Gladius was among the best performers for yield and stability.
- Taxon
- bread wheatTriticum aestivumt0
- Material
- Gladiuse0
- Outcome
- high yield and stabilitye0
- Setting
- all the environmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the best performing genotypes were AUS30355, followed by Gladius, Amir-2 and AUS30354 that showed high yield and stability across all the environments”
t0“bread wheat”
Claim · model-written summary
Amir-2 was among the best performers for yield and stability.
- Taxon
- bread wheatTriticum aestivumt0
- Material
- Amir-2e0
- Outcome
- high yield and stabilitye0
- Setting
- all the environmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the best performing genotypes were AUS30355, followed by Gladius, Amir-2 and AUS30354 that showed high yield and stability across all the environments”
t0“bread wheat”
Claim · model-written summary
AUS30354 was among the best performers for yield and stability.
- Taxon
- bread wheatTriticum aestivumt0
- Material
- AUS30354e0
- Outcome
- high yield and stabilitye0
- Setting
- all the environmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the best performing genotypes were AUS30355, followed by Gladius, Amir-2 and AUS30354 that showed high yield and stability across all the environments”
t0“bread wheat”
Claim · model-written summary
The selected genotypes were recommended for release or breeding parents.
- Taxon
- bread wheatTriticum aestivumt0
- Outcome
- direct release and/or for use as parents in the breeding programse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These genotypes are recommended for direct release and/or for use as parents in the breeding programs”
t0“bread wheat”