Abstract
Common bean ( Phaseolus vulgaris L.) is an important food crop, especially in East Africa and Central and South America. Subsistence farmer yields in these areas are limited by the many common bean cultivars that are drought sensitive. Consequently, a major goal of breeding programs is to improve drought tolerance. Our objective was to identify and compare physiological components of drought stress among common bean genotypes varying in stress tolerance. We also included the closely related and highly stress‐tolerant tepary bean ( P. acutifolius A. Gray). Compositional parameters often related to drought tolerance revealed no drought effect on free proline, but malate, glucose, fructose, inositol, and raffinose all increased, sometimes enough to osmotically adjust leaf tissues. Abscisic acid (ABA) was especially drought responsive. Although genotypic differences were unrelated to tolerance, grafting revealed that shoot identity controlled ABA levels in stressed roots and that root identity had little or no effect on stomatal behavior. Photosynthetic parameters derived from photosynthesis versus intercellular CO 2 concentration curves were not related to drought tolerance, but some traits were related to productivity. Stomatal control and low conductance were clearly associated with tolerance, conserving water during stress, and increasing water use efficiencies. This study should provide guidance in selection of traits associated with enhanced drought tolerance in common bean.
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Claims 11
Claim · model-written summary
Drought did not change free proline in common bean leaves.
- Taxon
- Common bean
Phaseolus vulgarise0 - Treatment
- droughte1
- Outcome
- free prolinee1
- Direction
- no drought effecte1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Common bean ( Phaseolus vulgaris L.)”
e1“Compositional parameters often related to drought tolerance revealed no drought effect on free proline, but malate, glucose, fructose, inositol, and raffinose all increased, sometimes enough to osmotically adjust leaf tissues”
Claim · model-written summary
Drought increased malate, glucose and fructose in common bean leaves.
- Taxon
- Common beanPhaseolus vulgarise0
- Treatment
- droughte1
- Outcome
- malate, glucose, fructosee1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Common bean ( Phaseolus vulgaris L.)”
e1“Compositional parameters often related to drought tolerance revealed no drought effect on free proline, but malate, glucose, fructose, inositol, and raffinose all increased, sometimes enough to osmotically adjust leaf tissues”
Claim · model-written summary
Drought increased inositol and raffinose in common bean leaves.
- Taxon
- Common beanPhaseolus vulgarise0
- Treatment
- droughte1
- Outcome
- inositol, and raffinosee1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Common bean ( Phaseolus vulgaris L.)”
e1“Compositional parameters often related to drought tolerance revealed no drought effect on free proline, but malate, glucose, fructose, inositol, and raffinose all increased, sometimes enough to osmotically adjust leaf tissues”
Claim · model-written summary
Abscisic acid was especially responsive to drought in common bean.
- Taxon
- Common beanPhaseolus vulgarise0
- Outcome
- Abscisic acid (ABA)e2
- Qualifier
- especially drought responsivee2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Common bean ( Phaseolus vulgaris L.)”
e2“Abscisic acid (ABA) was especially drought responsive”
Claim · model-written summary
Shoot identity controlled ABA levels in stressed roots in grafted common bean.
- Taxon
- Common beanPhaseolus vulgarise0
- Treatment
- graftinge3
- Outcome
- ABA levels in stressed rootse3
- Direction
- controllede3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Common bean ( Phaseolus vulgaris L.)”
e3“Although genotypic differences were unrelated to tolerance, grafting revealed that shoot identity controlled ABA levels in stressed roots and that root identity had little or no effect on stomatal behavior”
Claim · model-written summary
Root identity had little or no effect on stomatal behavior in grafted common bean.
- Taxon
- Common beanPhaseolus vulgarise0
- Treatment
- graftinge3
- Outcome
- stomatal behaviore3
- Direction
- little or no effecte3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Common bean ( Phaseolus vulgaris L.)”
e3“Although genotypic differences were unrelated to tolerance, grafting revealed that shoot identity controlled ABA levels in stressed roots and that root identity had little or no effect on stomatal behavior”
Claim · model-written summary
Genotypic differences in common bean were unrelated to drought tolerance.
- Taxon
- Common beanPhaseolus vulgarise0
- Outcome
- tolerancee3
- Qualifier
- genotypic differences were unrelated to tolerancee3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Common bean ( Phaseolus vulgaris L.)”
e3“Although genotypic differences were unrelated to tolerance, grafting revealed that shoot identity controlled ABA levels in stressed roots and that root identity had little or no effect on stomatal behavior”
Claim · model-written summary
Photosynthetic parameters derived from A-Ci curves were not related to drought tolerance in common bean.
- Taxon
- Common beanPhaseolus vulgarise0
- Outcome
- Photosynthetic parameterse4
- Qualifier
- not related to drought tolerancee4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Common bean ( Phaseolus vulgaris L.)”
e4“Photosynthetic parameters derived from photosynthesis versus intercellular CO 2 concentration curves were not related to drought tolerance, but some traits were related to productivity”
Claim · model-written summary
Some photosynthetic traits in common bean were related to productivity.
- Taxon
- Common beanPhaseolus vulgarise0
- Outcome
- productivitye4
- Qualifier
- some traits were related to productivitye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Common bean ( Phaseolus vulgaris L.)”
e4“Photosynthetic parameters derived from photosynthesis versus intercellular CO 2 concentration curves were not related to drought tolerance, but some traits were related to productivity”
Claim · model-written summary
Stomatal control and low conductance were associated with tolerance and increased water use efficiency during stress.
- Taxon
- Common beanPhaseolus vulgarise0
- Treatment
- stresse5
- Outcome
- water use efficienciese5
- Direction
- increasinge5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Common bean ( Phaseolus vulgaris L.)”
e5“Stomatal control and low conductance were clearly associated with tolerance, conserving water during stress, and increasing water use efficiencies”
Claim · model-written summary
Stomatal control and low conductance were clearly associated with drought tolerance.
- Taxon
- Common beanPhaseolus vulgarise0
- Treatment
- stresse5
- Outcome
- tolerancee5
- Direction
- clearly associatede5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Common bean ( Phaseolus vulgaris L.)”
e5“Stomatal control and low conductance were clearly associated with tolerance, conserving water during stress, and increasing water use efficiencies”
The same questions in other papers
drought · physiology: osmolytes · Phaseolus vulgaris (common bean)Results differ
4 in the opposite direction
- positive
- positive
- positive
1 paper more in this group
See all 5 papers →drought · molecular: metabolites · Phaseolus vulgaris (common bean)Positive and negative results
6 papers in the same direction as this paper · 16 in the opposite direction
- no effect
- negative
- no effect
19 papers more in this group
See all 23 papers →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.