Abstract
SUMMARY The objective of this study was to identify traits related to growth and yield response under drought stress in the field which would show less variation than yield itself. Experiments were conducted in 1987, at Durango, Mexico and at Michigan, USA. Twenty-six dry bean genotypes were sown under supplementary irrigation and terminal drought stress. Plant samples were taken at 50% flowering, mid-pod-filling and physiological maturity. At both sites, leaf expansion rate and crop growth rate at mid-pod-filling were greatly reduced by drought stress, resulting in significant reductions in total dry matter (DM) above ground and seed yield at physiological maturity. Because of differences in the timing and intensity of the drought stress, the yield components were affected differently at each location. Total DM content at physiological maturity, harvest index and number of pods/m 2 were the only traits positively correlated with yield under stress at both locations. In order to evaluate a group of genotypes for adaptation to drought on the basis of seed yield, the genotypes should be grouped according to their phenological characteristics to stress them evenly.
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Claims 8
Claim · model-written summary
Drought greatly reduced leaf expansion rate and crop growth rate at mid-pod-filling.
- Taxon
- dry beant0
- Organ / stage
- mid-pod-fillinge0
- Treatment
- drought stresse0
- Outcome
- leaf expansion rate and crop growth ratee0
- Direction
- greatly reducede0
Not reportedComparator
Verbatim
t0“dry bean (Phaseolus vulgaris)”
e0“At both sites, leaf expansion rate and crop growth rate at mid-pod-filling were greatly reduced by drought stress”
Claim · model-written summary
Drought significantly reduced aboveground dry matter at maturity.
- Taxon
- dry beant0
- Organ / stage
- physiological maturitye0
- Treatment
- drought stresse1
- Outcome
- total dry matter (DM) above grounde0
- Direction
- reductionse0
Not reportedComparator
Verbatim
t0“dry bean (Phaseolus vulgaris)”
e0“resulting in significant reductions in total dry matter (DM) above ground and seed yield at physiological maturity”
e1“drought stress, resulting in significant reductions in total dry matter (DM) above ground”
Claim · model-written summary
Drought significantly reduced seed yield at maturity.
- Taxon
- dry beant0
- Organ / stage
- physiological maturitye0
- Treatment
- drought stresse0
- Outcome
- seed yielde0
- Direction
- reductionse0
Not reportedComparator
Verbatim
t0“dry bean (Phaseolus vulgaris)”
e0“drought stress, resulting in significant reductions in total dry matter (DM) above ground and seed yield at physiological maturity”
Claim · model-written summary
Yield components differed in drought response between locations owing to timing and intensity.
Verbatim
t0“dry bean (Phaseolus vulgaris)”
e0“Because of differences in the timing and intensity of the drought stress, the yield components were affected differently at each location.”
Claim · model-written summary
Dry matter at maturity correlated positively with yield under stress at both sites.
Verbatim
t0“dry bean (Phaseolus vulgaris)”
e0“Total DM content at physiological maturity, harvest index and number of pods/m 2 were the only traits positively correlated with yield under stress at both locations.”
Claim · model-written summary
Harvest index correlated positively with yield under stress at both sites.
Verbatim
t0“dry bean (Phaseolus vulgaris)”
e0“Total DM content at physiological maturity, harvest index and number of pods/m 2 were the only traits positively correlated with yield under stress at both locations.”
Claim · model-written summary
Pod number correlated positively with yield under stress at both sites.
Verbatim
t0“dry bean (Phaseolus vulgaris)”
e0“Total DM content at physiological maturity, harvest index and number of pods/m 2 were the only traits positively correlated with yield under stress at both locations.”
Claim · model-written summary
Authors recommend grouping genotypes by phenology to apply drought evenly when evaluating adaptation.
Verbatim
t0“dry bean (Phaseolus vulgaris)”
e0“the genotypes should be grouped according to their phenological characteristics to stress them evenly”
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