Abstract
A method was developed where soybean seedlings were grown without roots to study the influence of hormones of root origin on shoot growth. Excision of the root resulted in inhibition of apical section growth and DNA synthesis and inhibited elongating section growth. A synthetic cytokinin restored DNA synthesis in the apical section, but did not influence growth in either the apical or elongating sections. Low concentrations of gibberellin with the cytokinin restored growth in the apical section. Gibberellin alone was sufficient to restore growth in the elongating section. An inhibitor of DNA synthesis, 5-fluorodeoxyuridine, inhibited the increase in apical section DNA without inhibiting control or gibberellin-induced growth in the elongating section. Experiments with (14)C-thymidine resulted in no DNA labeling differences in the elongating section under conditions where gibberellin-induced elongation varied from 50% to 73% above controls. It was concluded that gibberellin-induced elongation in soybean hypocotyl occurred in the absence of DNA synthesis. Gibberellin does stimulate DNA synthesis in the apical tissue apart from its effect on cell elongation. Excised soybean hypocotyl elongated maximally at 10(-6)m auxin. At higher auxin concentrations, fresh weight and ethylene production increased, but elongation was reduced. Addition of GA to the higher auxin concentrations resulted in a 50% inhibition in auxin-induced ethylene production and resumption in maximal elongation. Added ethylene inhibited elongation 30% at 2 mul/l. Addition of up to 100 mul/l ethylene did not inhibit elongation with GA present in the incubation medium. Thus GA may counteract ehtylene inhibition of cell elongation in addition to inhibiting ethylene production in auxin-treated tissues.
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Claims 17
Claim · model-written summary
Root excision inhibited apical section growth and DNA synthesis.
- Taxon
- soybean
Glycine maxt0 - Treatment
- Excision of the roote0
- Outcome
- apical section growth and DNA synthesise0
- Direction
- inhibitione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excision of the root resulted in inhibition of apical section growth and DNA synthesis”
t0“Rootless Soybean”
Claim · model-written summary
Root excision inhibited elongating section growth.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Excision of the roote0
- Outcome
- elongating section growthe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excision of the root resulted in inhibition of apical section growth and DNA synthesis and inhibited elongating section growth”
t0“Rootless Soybean”
Claim · model-written summary
Synthetic cytokinin restored apical DNA synthesis.
- Taxon
- soybeanGlycine maxt0
- Treatment
- A synthetic cytokinine0
- Outcome
- DNA synthesis in the apical sectione0
- Direction
- restorede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A synthetic cytokinin restored DNA synthesis in the apical section”
t0“Rootless Soybean”
Claim · model-written summary
Synthetic cytokinin did not influence growth in apical or elongating sections.
- Taxon
- soybeanGlycine maxt0
- Treatment
- A synthetic cytokinine0
- Outcome
- growth in either the apical or elongating sectionse0
- Direction
- did not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A synthetic cytokinin restored DNA synthesis in the apical section, but did not influence growth in either the apical or elongating sections”
t0“Rootless Soybean”
Claim · model-written summary
Low gibberellin concentrations with cytokinin restored apical growth.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Low concentrations of gibberellin with the cytokinine0
- Outcome
- growth in the apical sectione0
- Direction
- restorede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Low concentrations of gibberellin with the cytokinin restored growth in the apical section”
t0“Rootless Soybean”
Claim · model-written summary
Gibberellin alone restored elongating section growth.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Gibberellin alonee0
- Outcome
- growth in the elongating sectione0
- Direction
- restoree0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellin alone was sufficient to restore growth in the elongating section”
t0“Rootless Soybean”
Claim · model-written summary
5-fluorodeoxyuridine inhibited apical section DNA increase.
- Taxon
- soybeanGlycine maxt0
- Treatment
- 5-fluorodeoxyuridinee0
- Outcome
- increase in apical section DNAe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An inhibitor of DNA synthesis, 5-fluorodeoxyuridine, inhibited the increase in apical section DNA”
t0“Rootless Soybean”
Claim · model-written summary
5-fluorodeoxyuridine did not inhibit control or gibberellin-induced elongating section growth.
- Taxon
- soybeanGlycine maxt0
- Treatment
- 5-fluorodeoxyuridinee0
- Outcome
- control or gibberellin-induced growth in the elongating sectione0
- Direction
- without inhibitinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“5-fluorodeoxyuridine, inhibited the increase in apical section DNA without inhibiting control or gibberellin-induced growth in the elongating section”
t0“Rootless Soybean”
Claim · model-written summary
Elongating section DNA labeling did not differ while gibberellin-induced elongation varied 50% to 73% above controls.
- Taxon
- soybeanGlycine maxt0
- Outcome
- DNA labeling differences in the elongating sectione0
- Direction
- noe0
- Qualifier
- gibberellin-induced elongation varied from 50% to 73% above controlse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“no DNA labeling differences in the elongating section under conditions where gibberellin-induced elongation varied from 50% to 73% above controls”
t0“Rootless Soybean”
Claim · model-written summary
Gibberellin stimulated DNA synthesis in apical tissue apart from elongation.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Gibberelline0
- Outcome
- DNA synthesis in the apical tissuee0
- Direction
- stimulatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellin does stimulate DNA synthesis in the apical tissue apart from its effect on cell elongation”
t0“Rootless Soybean”
Claim · model-written summary
Excised hypocotyl elongated maximally at 10(-6)m auxin.
- Taxon
- soybeanGlycine maxe0
- Treatment
- 10(-6)m auxine0
- Outcome
- hypocotyl elongated maximallye0
- Direction
- maximallye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Excised soybean hypocotyl elongated maximally at 10(-6)m auxin”
t0“Rootless Soybean”
Claim · model-written summary
Higher auxin concentrations increased fresh weight and ethylene production.
- Taxon
- soybeanGlycine maxt0
- Treatment
- higher auxin concentrationse0
- Outcome
- fresh weight and ethylene productione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At higher auxin concentrations, fresh weight and ethylene production increased”
t0“Rootless Soybean”
Claim · model-written summary
Higher auxin concentrations reduced elongation.
- Taxon
- soybeanGlycine maxt0
- Treatment
- higher auxin concentrationse0
- Outcome
- elongatione0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At higher auxin concentrations, fresh weight and ethylene production increased, but elongation was reduced”
t0“Rootless Soybean”
Claim · model-written summary
Adding GA at higher auxin concentrations inhibited auxin-induced ethylene production by 50%.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Addition of GA to the higher auxin concentrationse0
- Outcome
- auxin-induced ethylene productione0
- Direction
- inhibitione0
- Value
- 50%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of GA to the higher auxin concentrations resulted in a 50% inhibition in auxin-induced ethylene production”
t0“Rootless Soybean”
Claim · model-written summary
GA with higher auxin concentrations restored maximal elongation.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Addition of GA to the higher auxin concentrationse0
- Outcome
- maximal elongatione0
- Direction
- resumptione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of GA to the higher auxin concentrations resulted in a 50% inhibition in auxin-induced ethylene production and resumption in maximal elongation”
t0“Rootless Soybean”
Claim · model-written summary
Added ethylene inhibited elongation 30% at 2 mul/l.
- Taxon
- soybeanGlycine maxt0
- Treatment
- Added ethylenee0
- Outcome
- elongatione0
- Direction
- inhibitede0
- Value
- 30%e0
- Qualifier
- 2 mul/le0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Added ethylene inhibited elongation 30% at 2 mul/l”
t0“Rootless Soybean”
Claim · model-written summary
Up to 100 mul/l ethylene did not inhibit elongation with GA in the medium.
- Taxon
- soybeanGlycine maxt0
- Treatment
- up to 100 mul/l ethylenee0
- Outcome
- elongatione0
- Direction
- did not inhibite0
- Qualifier
- GA present in the incubation mediume0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Addition of up to 100 mul/l ethylene did not inhibit elongation with GA present in the incubation medium”
t0“Rootless Soybean”
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