Abstract
A continuous growth apparatus was used to measure the effect of cytokinin on auxin-induced elongation. The soybean hypocotyl segments elicited a bi-phasic response to auxin that appeared to be two overlapping responses. The first response, which began 12 min after auxin addition, was not inhibited by cytokinin, even after long preincubation in cytokinin, but the second response to auxin, which began about 30 min after auxin addition, was completely inhibited by cytokinin. Such overlapping reactions are shown, depending on the amount of overlap, to yield a variety of summation reactions, many of which resemble rate-time curves that have been previously reported. We have shown that the transient first phase of auxin-induced elongation is very similar to acid-activated growth, while the second phase is long lasting and very likely identical to the long-term response to auxin, as extensively studied in Avena, soybean, and other elongating cells.
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Claims 6
Claim · model-written summary
Soybean hypocotyls showed two overlapping phases of auxin-induced elongation.
- Taxon
- soybean
Glycine maxe0 - Organ / stage
- hypocotyl segmentse0
- Outcome
- bi-phasic response to auxine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The soybean hypocotyl segments elicited a bi-phasic response to auxin that appeared to be two overlapping responses”
Claim · model-written summary
The first auxin response began 12 minutes after auxin addition and resisted cytokinin inhibition.
- Taxon
- soybeanGlycine maxt0
- Treatment
- cytokinine0
- Outcome
- first responsee0
- Direction
- not inhibitede0
- Value
- 12 mine0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The first response, which began 12 min after auxin addition, was not inhibited by cytokinin, even after long preincubation in cytokinin”
t0“soybean hypocotyl segments”
Claim · model-written summary
Cytokinin completely inhibited the second auxin response, which began about 30 minutes after auxin addition.
- Taxon
- soybeanGlycine maxt0
- Treatment
- cytokinine0
- Outcome
- second response to auxine0
- Direction
- completely inhibitede0
- Value
- 30 mine0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the second response to auxin, which began about 30 min after auxin addition, was completely inhibited by cytokinin”
t0“soybean hypocotyl segments”
Claim · model-written summary
Overlapping growth reactions yielded a variety of summation reactions resembling previously reported rate-time curves.
- Taxon
- soybeanGlycine maxt0
- Outcome
- a variety of summation reactionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Such overlapping reactions are shown, depending on the amount of overlap, to yield a variety of summation reactions, many of which resemble rate-time curves that have been previously reported”
t0“soybean hypocotyl segments”
Claim · model-written summary
The first auxin-induced elongation phase was very similar to acid-activated growth.
- Taxon
- soybeanGlycine maxt0
- Outcome
- very similar to acid-activated growthe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the transient first phase of auxin-induced elongation is very similar to acid-activated growth”
t0“soybean hypocotyl segments”
Claim · model-written summary
The second elongation phase was long lasting and likely equivalent to the long-term auxin response.
- Taxon
- soybeanGlycine maxt0
- Outcome
- long lasting and very likely identical to the long-term response to auxine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the second phase is long lasting and very likely identical to the long-term response to auxin”
t0“soybean hypocotyl segments”
The same questions in other papers
class · physiology: hormones · Glycine max (soybean)Positive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.