Abstract
The supernodulating soybean (Glycine max (L.) Merr.) cultivar Kanto 100 was previously characterized by superior nitrogen (N) fixation and photosynthesis, and resulting in high yields. However, this cultivar seems to be susceptible to waterlogging during the vegetative growth stage, which frequently occurs in major soybean producing areas in East Asia. The objective of this study was to compare the effects of waterlogging on nodulation, N fixation and photosynthesis in Kanto 100 with those in its normally-nodulating ancestral cultivar Enrei. Kanto 100 and Enrei were grown in pots, and subjected to waterlogging for 10 days at three vegetative growth stages in 2003 and 2004. Waterlogging significantly reduced the number of nodules of both cultivars, but the magnitude of the reduction was more pronounced in Kanto 100. The acetylene reduction activity (ARA) of nodules and apparent photosynthetic rate (AP) of leaves were generally depressed immediately after the start of waterlogging, but both functions recovered substantially at the pod-filling stage in both cultivars. No marked cultivar difference was found in the magnitude of the reduction of ARA per plant and AP measured immediately after waterlogging and at the pod-filling stage in both years, but growth impairment was more pronounced in Kanto 100 in 2003. These results suggest that the supernodulating cultivar Kanto 100 is more susceptible to waterlogging than its normally-nodulating ancestral cultivar.
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Claims 7
Claim · model-written summary
Waterlogging significantly reduced nodule number in both soybean cultivars.
- Taxon
- Soybean
Glycine maxt0 - Treatment
- Waterlogginge0
- Outcome
- number of nodulese0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Waterlogging significantly reduced the number of nodules of both cultivars”
t0“Soybean Cultivar Kanto 100”
Claim · model-written summary
The waterlogging reduction in nodule number was more pronounced in Kanto 100.
- Taxon
- soybeanGlycine maxt0
- Material
- Kanto 100e0
- Outcome
- magnitude of the reductione0
- Direction
- more pronouncede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the magnitude of the reduction was more pronounced in Kanto 100”
t0“Soybean Cultivar Kanto 100”
Claim · model-written summary
Waterlogging initially depressed nodule acetylene reduction activity.
- Taxon
- soybeanGlycine maxt0
- Treatment
- waterlogginge0
- Outcome
- acetylene reduction activity (ARA) of nodulese0
- Direction
- depressede0
- Qualifier
- immediately after the start of waterlogginge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The acetylene reduction activity (ARA) of nodules and apparent photosynthetic rate (AP) of leaves were generally depressed immediately after the start of waterlogging”
t0“Soybean Cultivar Kanto 100”
Claim · model-written summary
Waterlogging initially depressed apparent leaf photosynthetic rate.
- Taxon
- soybeanGlycine maxt0
- Treatment
- waterlogginge0
- Outcome
- apparent photosynthetic rate (AP) of leavese0
- Direction
- depressede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The acetylene reduction activity (ARA) of nodules and apparent photosynthetic rate (AP) of leaves were generally depressed immediately after the start of waterlogging”
t0“Soybean Cultivar Kanto 100”
Claim · model-written summary
Both functions substantially recovered at pod filling in both cultivars.
- Taxon
- soybeanGlycine maxt0
- Organ / stage
- pod-filling stagee0
- Outcome
- both functionse0
- Direction
- recovered substantiallye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both functions recovered substantially at the pod-filling stage in both cultivars”
t0“Soybean Cultivar Kanto 100”
Claim · model-written summary
The cultivars had no marked difference in waterlogging reduction of plant ARA and AP.
- Taxon
- soybeanGlycine maxt0
- Material
- Kanto 100t0
- Outcome
- magnitude of the reduction of ARA per plant and APe0
- Direction
- No marked cultivar differencee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No marked cultivar difference was found in the magnitude of the reduction of ARA per plant and AP measured immediately after waterlogging and at the pod-filling stage in both years”
t0“Soybean Cultivar Kanto 100”
Claim · model-written summary
Growth impairment was greater in Kanto 100 in 2003.
- Taxon
- soybeanGlycine maxt0
- Material
- Kanto 100e0
- Outcome
- growth impairmente0
- Direction
- more pronouncede0
- Qualifier
- in 2003e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growth impairment was more pronounced in Kanto 100 in 2003”
t0“Soybean Cultivar Kanto 100”
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