Abstract
Soybean (Glycine max) is one of the main crops cultivated worldwide and drought is the main abiotic stress affecting its production. However, breeding towards drought tolerance is often set aside due to the difficulties in phenotyping. The aim of this study was to design an effective and simple screening technique that allows to discriminate genotypes according to their drought response and to identify physiological traits responsible for a superior tolerance. This rapid screening evaluated morphological (shoot and root length and weight) and developmental traits (days to germination and plant establishment) of 604 genotypes under control and drought conditions. Two genotypes with contrasting responses (Sensitive Genotype and Tolerant Genotype, SG and TG, respectively) were selected according to their performance in the screening, and were subjected to further testing in order to physiologically characterize the drought response of the chosen cultivars. Wilting, normalized transpiration ratio, leaf gas exchange parameters, water use efficiency (WUE) and stomatal characterizations were performed. TG plants exhibited slow wilting and higher WUE when subjected to drought treatments, product of a reduced water loss due to an anticipated stomatal closure which allowed to preserve soil moisture. Besides, under control conditions, the TG genotype presented a higher stomatal aperture index and a bigger density of epidermal cells and stomata than the drought-sensitive genotypes analyzed. In summary, the analysis of easily quantifiable traits, as the growth of the plant aerial organs and root development, together with the plant development timing, allowed us to select two soybean cultivars with contrasting drought responses. In our opinion, this selection method might be efficiently applied for the selection of drought tolerant cultivars in plant species of agronomic interest.
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Claims 7
Claim · model-written summary
A screen of morphological and developmental traits selected two soybean genotypes with contrasting drought responses.
Verbatim
e0“This rapid screening evaluated morphological (shoot and root length and weight) and developmental traits (days to germination and plant establishment) of 604 genotypes under control and drought conditions.”
e1“Two genotypes with contrasting responses (Sensitive Genotype and Tolerant Genotype, SG and TG, respectively) were selected according to their performance in the screening”
Claim · model-written summary
Tolerant Genotype plants wilted slowly under drought treatment.
Not reportedComparator
Verbatim
e0“TG plants exhibited slow wilting and higher WUE when subjected to drought treatments”
Claim · model-written summary
Tolerant Genotype plants had higher water use efficiency under drought treatment.
Not reportedComparator
Verbatim
e0“TG plants exhibited slow wilting and higher WUE when subjected to drought treatments”
Claim · model-written summary
Tolerant Genotype plants had reduced water loss associated with earlier stomatal closure, preserving soil moisture.
- Taxon
- soybean
Glycine maxt0 - Outcome
- reduced water losse0
- Direction
- reducede0
- Qualifier
- anticipated stomatal closuree0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“product of a reduced water loss due to an anticipated stomatal closure which allowed to preserve soil moisture”
t0“soybean”
Claim · model-written summary
Under control conditions, the tolerant genotype had a higher stomatal aperture index than drought-sensitive genotypes.
- Taxon
- soybeanGlycine maxt0
- Material
- TG genotypee0
- Outcome
- stomatal aperture indexe0
- Direction
- highere0
- Comparator
- drought-sensitive genotypese0
- Setting
- control conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under control conditions, the TG genotype presented a higher stomatal aperture index and a bigger density of epidermal cells and stomata than the drought-sensitive genotypes analyzed”
t0“soybean”
Claim · model-written summary
Under control conditions, the tolerant genotype had a greater density of epidermal cells and stomata than drought-sensitive genotypes.
- Taxon
- soybeanGlycine maxt0
- Material
- TG genotypee0
- Outcome
- density of epidermal cells and stomatae0
- Direction
- biggere0
- Comparator
- drought-sensitive genotypese0
- Setting
- control conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under control conditions, the TG genotype presented a higher stomatal aperture index and a bigger density of epidermal cells and stomata than the drought-sensitive genotypes analyzed”
t0“soybean”
Claim · model-written summary
The authors suggest the trait-based selection method may efficiently select drought-tolerant cultivars in agronomic plant species.
- Taxon
- soybeanGlycine maxt0
- Outcome
- selection of drought tolerant cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“this selection method might be efficiently applied for the selection of drought tolerant cultivars in plant species of agronomic interest”
t0“soybean”
The same questions in other papers
drought · disease · Viridiplantae (plants)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- no effect
- no effect
- positive
drought · physiology: water · Viridiplantae (plants)Positive and negative results
3 in the opposite direction
- negative
- negative
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.