Abstract
Drought stress is one of the main limiting factors crop production in arid and semiarid regions. In this study, drought tolerance of 19 wheat genotypes were evaluated by using UPGMA cluster analysis. To this end, the effect of drought stress on a number of related agronomic and physiological traits of wheat genotypes, belonging to three groups of sensitive, intermediate and drought tolerant, under three conditions of normal, moderate and severe drought stress were studied. A factorial experiment based on completely randomized design with three replications was performed. Traits like plant height, shoot fresh weight, spike length, awn length, shoot dry weight, seed yield and relative water content of genotypes were measured. Analysis of variance showed that the effects of drought on all traits except awn length were significant. Most of the traits were negatively affected by drought stress. Highest reduction was observed in grain yield. Cluster analysis grouped genotypes exposed to drought stresses in to three categories. Genotypes numbering 15, 13, 12, 16 and 17 expirienced low means in all of traits under study. The results also showed that the second and third groups, resulting from cluster analysis, were in agreement with the results of previous researches reported. The first cluster, however, was found to be inconsistent with their initial introduction grouping under severe drought stress conditions. Therefore, the initial grouping was consistent especially in most of sensitive and tolerant genotypes under severe drought stress conditions.
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Claims 6
Claim · model-written summary
Analysis of variance showed that the effects of drought on all traits except awn length were significant.
- Taxon
- Winter Wheat
Triticum aestivumt0 - Treatment
- droughte0
- Outcome
- all traits except awn lengthe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“Analysis of variance showed that the effects of drought on all traits except awn length were significant.”
Claim · model-written summary
Most of the traits were negatively affected by drought stress.
- Taxon
- Winter WheatTriticum aestivumt0
- Treatment
- drought stresse0
- Outcome
- Most of the traitse0
- Direction
- negativelye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“Most of the traits were negatively affected by drought stress.”
Claim · model-written summary
Highest reduction was observed in grain yield.
- Taxon
- Winter WheatTriticum aestivumt0
- Outcome
- grain yielde0
- Direction
- reductione0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“Highest reduction was observed in grain yield.”
Claim · model-written summary
Cluster analysis grouped genotypes exposed to drought stresses in to three categories.
- Taxon
- Winter WheatTriticum aestivumt0
- Outcome
- three categoriese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“Cluster analysis grouped genotypes exposed to drought stresses in to three categories.”
Claim · model-written summary
Genotypes numbering 15, 13, 12, 16 and 17 expirienced low means in all of traits under study.
- Taxon
- Winter WheatTriticum aestivumt0
- Material
- Genotypes numbering 15, 13, 12, 16 and 17e0
- Outcome
- low means in all of traitse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“Genotypes numbering 15, 13, 12, 16 and 17 expirienced low means in all of traits under study.”
Claim · model-written summary
The first cluster, however, was found to be inconsistent with their initial introduction grouping under severe drought stress conditions.
- Taxon
- Winter WheatTriticum aestivumt0
- Outcome
- first clustere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Winter Wheat”
e0“The first cluster, however, was found to be inconsistent with their initial introduction grouping under severe drought stress conditions.”