Abstract
Wild-type soybean (Glycine max [L] Merr. cv Bragg) and a nitrate-tolerant supernodulating mutant (nts382) were grown in split root systems to investigate the involvement of the autoregulation response and the effect of timing of inoculation on nodule suppression. In Bragg, nodulation of the root portion receiving the delayed inoculation was suppressed nearly 100% by a 7-day prior inoculation of the other root portion with Bradyrhizobium japonicum strain USDA 110. Significant suppression was also observed after a 24-hour delay in inoculation. Mutant nts382 in the presence of a low nitrate level (0.5 millimolar) showed little, if any, systemic suppression. Root fresh weights of individual root portions were similar for both wild type and nts382 mutant. When nts382 was grown in the absence of nitrate, a 7-day delay in inoculation resulted in only 30% suppression of nodulation and a significant difference in root fresh weight between the two sides, with the delayed inoculated side always being smaller. Nodulation tests on split roots of nts382, nts1116, and wild-type cultivars Bragg, Williams 82, and Clark demonstrated a difference in their systemic suppression ability. These observations indicate that (a) autoregulation deficiencies in mutant nts382 result in a reduction of systemic suppression of nodulation, (b) some suppression is detectable after 24 hours with a delayed inoculation, (c) the presence of low nitrate affects the degree of suppression and the root growth, and (d) soybean genotypes differ in their ability to express this systemic suppression.
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Claims 7
Claim · model-written summary
In Bragg, seven-day prior inoculation suppressed nodulation of the delayed side nearly 100%.
- Taxon
- soybean
Glycine maxt0 - Material
- Bragge0
- Treatment
- 7-day prior inoculatione0
- Interactor
- Bradyrhizobium japonicum strain USDA 110
Bradyrhizobium japonicume0symbiont - Outcome
- nodulatione0
- Direction
- suppressede0
- Value
- nearly 100%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“In Bragg, nodulation of the root portion receiving the delayed inoculation was suppressed nearly 100% by a 7-day prior inoculation of the other root portion with Bradyrhizobium japonicum strain USDA 110”
Claim · model-written summary
A 24-hour inoculation delay significantly suppressed Bragg nodulation.
- Taxon
- soybeanGlycine maxt0
- Treatment
- 24-hour delay in inoculatione0
- Outcome
- suppressione0
- Direction
- suppressione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“Significant suppression was also observed after a 24-hour delay in inoculation”
Claim · model-written summary
At low nitrate, nts382 showed little systemic suppression.
- Taxon
- soybeanGlycine maxt0
- Material
- nts382e0
- Outcome
- systemic suppressione0
- Direction
- little, if anye0
- Qualifier
- 0.5 millimolare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“Mutant nts382 in the presence of a low nitrate level (0.5 millimolar) showed little, if any, systemic suppression”
Claim · model-written summary
Root fresh weights were similar in wild type and nts382.
- Taxon
- soybeanGlycine maxt0
- Material
- nts382e0
- Outcome
- Root fresh weightse0
- Direction
- similare0
- Comparator
- wild typee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“Root fresh weights of individual root portions were similar for both wild type and nts382 mutant”
Claim · model-written summary
Without nitrate, a seven-day inoculation delay suppressed nts382 nodulation by only 30%.
- Taxon
- soybeanGlycine maxt0
- Material
- nts382e0
- Treatment
- 7-day delay in inoculatione0
- Outcome
- nodulatione0
- Direction
- suppressione0
- Value
- 30%e0
- Qualifier
- absence of nitratee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“When nts382 was grown in the absence of nitrate, a 7-day delay in inoculation resulted in only 30% suppression of nodulation”
Claim · model-written summary
Without nitrate, the delayed inoculated side had significantly smaller root fresh weight.
- Taxon
- soybeanGlycine maxt0
- Treatment
- delayed inoculatede0
- Outcome
- root fresh weighte0
- Direction
- smallere0
- Comparator
- the two sidese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“a significant difference in root fresh weight between the two sides, with the delayed inoculated side always being smaller”
Claim · model-written summary
Soybean genotypes differed in systemic suppression ability.
- Taxon
- soybeanGlycine maxt0
- Material
- nts382, nts1116, and wild-type cultivars Bragg, Williams 82, and Clarke0
- Outcome
- systemic suppression abilitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“soybean”
e0“Nodulation tests on split roots of nts382, nts1116, and wild-type cultivars Bragg, Williams 82, and Clark demonstrated a difference in their systemic suppression ability”
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