Abstract
Abstract Several soybean [Glycine max (L.) Merr.] germplasms from maturity groups III through VII were evaluated at three osmotic potential levels (‐0.017, 0.3 and ‐0.5 MPa) using polyethylene glycol M.W. 8000 and four temperature regimes (10, 25, 50 and 110°C) for drought and heat tolerance, respectively. Heat injury varied significantly among growth stages with the highest heat injury occurring at the flowering stage. Susceptibility to heat injury decreased toward maturity with the exception of a few genotypes. Genotypic variability was found among the lines in both drought and heat tolerance tests. This study identified the lines PI 408.155, PI 423.827B, PI 423.759 and Pershing as both drought and heat tolerant. In general, the larger‐seeded lines failed to germinate at ‐0.50 MPa. A positive and significant relationship between promptness index and germina‐tion stress index was found. However, no significant correlation was observed between germination stress index and the heat tolerance test. Based on the results from the germination test, lines PI 393.550, PI393.547, PI 86.103, PI 171.437, PI 86.490 and PI 423.852 had high germination stress indices and need further testing for heat stress tolerance.
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Claims 9
Claim · model-written summary
Heat injury differed significantly by growth stage and peaked at flowering.
- Taxon
- Soybean
Glycine maxt0 - Organ / stage
- flowering stagee0
- Outcome
- Heat injurye0
- Direction
- higheste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat injury varied significantly among growth stages with the highest heat injury occurring at the flowering stage”
t0“Soybean”
Claim · model-written summary
Heat injury susceptibility generally decreased toward maturity.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- Susceptibility to heat injurye0
- Direction
- decreasede0
- Qualifier
- with the exception of a few genotypese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Susceptibility to heat injury decreased toward maturity with the exception of a few genotypes”
t0“Soybean”
Claim · model-written summary
Genotypes varied in drought and heat tolerance.
- Taxon
- SoybeanGlycine maxt0
- Material
- the linese0
- Outcome
- drought and heat tolerancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypic variability was found among the lines in both drought and heat tolerance tests”
t0“Soybean”
Claim · model-written summary
PI 408.155, PI 423.827B, PI 423.759 and Pershing were drought and heat tolerant.
- Taxon
- SoybeanGlycine maxt0
- Material
- PI 408.155, PI 423.827B, PI 423.759 and Pershinge0
- Outcome
- both drought and heat tolerante0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the lines PI 408.155, PI 423.827B, PI 423.759 and Pershing as both drought and heat tolerant”
t0“Soybean”
Claim · model-written summary
Larger-seeded lines generally failed to germinate at −0.50 MPa.
- Taxon
- SoybeanGlycine maxt0
- Material
- larger‐seeded linese0
- Outcome
- failed to germinatee0
- Qualifier
- ‐0.50 MPae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the larger‐seeded lines failed to germinate at ‐0.50 MPa”
t0“Soybean”
Claim · model-written summary
Promptness index correlated positively and significantly with germination stress index.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- germina‐tion stress indexe0
- Direction
- positivee0
- Comparator
- promptness indexe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A positive and significant relationship between promptness index and germina‐tion stress index was found”
t0“Soybean”
Claim · model-written summary
Germination stress index was not significantly correlated with the heat tolerance test.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- germination stress indexe0
- Comparator
- heat tolerance teste0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no significant correlation was observed between germination stress index and the heat tolerance test”
t0“Soybean”
Claim · model-written summary
Six listed lines had high germination stress indices.
- Taxon
- SoybeanGlycine maxt0
- Material
- PI 393.550, PI393.547, PI 86.103, PI 171.437, PI 86.490 and PI 423.852e0
- Outcome
- germination stress indicese0
- Direction
- highe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lines PI 393.550, PI393.547, PI 86.103, PI 171.437, PI 86.490 and PI 423.852 had high germination stress indices”
t0“Soybean”
Claim · model-written summary
The high-index lines need further heat stress testing.
- Taxon
- SoybeanGlycine maxt0
- Outcome
- further testing for heat stress tolerancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“need further testing for heat stress tolerance”
t0“Soybean”