Abstract
Studies have been made of the growth in culture medium of the component parts of compositesegments excised from 3 to 7-day-old Avena sativa seedlings and comprising portions of coleoptile and first leaf bases and various lengths of first internode tissue. The effects of various concentrations of gibberellic acid (GA) and indole-3- acetic acid (IAA) alone and in combination have been studied on the growth of these organs. Both GA and IAA stimulate the growth of coleoptile base tissue but in combination their joint effects are less than additive. No synergism occurs. The growth of the first-leaf base is greatly stimulated by GA but is inhibited by IAA. In combination, the stimulatory effect of GA (up to 1 0 p.p.m.) may be virtually eliminated by even low concentrations of IAA (0.01 p.p.m.). The inclusion of first internode tissue in the segments considerably increases the growth of first leaf base tissue but has no consistent effect on the growth of coleoptile base tissue. The presence of first internode tissue also greatly increases the degree of growth stimulation invoked by GA but does not influence the degree of IAA inhibition. It is postulated that the first internode tissue is the source of an unknown growth factor necessary for GA action in the first leaf and potentiating the action of endogenous gibberellin. Kinetin, adenine sulphate, glutarnine, glutarnic acid, asparagine, glycine, arginine, histidine, lysine, aneurin, and pyridoxine will not simulate the effects of this unknown growth factor in the growth of leaf tissue. Like IAA, kinetin virtually eliminates the GA stimulation of leaf growth. A study of extracts of internode tissue in various solvents, analysed by paper partition chromatography and assayed by the growth of the first leaf base, has indicated the presence of growth inhibitors and gibberellin-like substances but has failed to isolate the postulated endogenous GA-synergist. The implications of these results for growth correlations and the hormone control of shoot growth in Avena sativa seedlings is discussed.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 15
Claim · model-written summary
GA stimulated Avena coleoptile base growth.
- Taxon
- Avena sativa
Avena sativae1 - Organ / stage
- coleoptile base tissuee0
- Treatment
- GAe0
- Outcome
- growth of coleoptile base tissuee0
- Direction
- stimulatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both GA and IAA stimulate the growth of coleoptile base tissue”
e1“3 to 7-day-old Avena sativa seedlings”
Claim · model-written summary
IAA stimulated Avena coleoptile base growth.
- Taxon
- Avena sativaAvena sativae1
- Treatment
- IAAe0
- Outcome
- growth of coleoptile base tissuee0
- Direction
- stimulatee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both GA and IAA stimulate the growth of coleoptile base tissue”
e1“3 to 7-day-old Avena sativa seedlings”
Claim · model-written summary
Combined GA and IAA stimulation of coleoptile base growth was less than additive, without synergy.
- Taxon
- Avena sativaAvena sativae2
- Treatment
- GA and IAAe1
- Outcome
- growth of coleoptile base tissuee1
- Direction
- less than additivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in combination their joint effects are less than additive. No synergism occurs.”
e1“Both GA and IAA stimulate the growth of coleoptile base tissue”
e2“3 to 7-day-old Avena sativa seedlings”
Claim · model-written summary
GA greatly stimulated first-leaf base growth.
- Taxon
- Avena sativaAvena sativae1
- Treatment
- GAe0
- Outcome
- growth of the first-leaf basee0
- Direction
- greatly stimulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth of the first-leaf base is greatly stimulated by GA”
e1“3 to 7-day-old Avena sativa seedlings”
Claim · model-written summary
IAA inhibited first-leaf base growth.
- Taxon
- Avena sativaAvena sativae1
- Treatment
- IAAe0
- Outcome
- growth of the first-leaf basee0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth of the first-leaf base is greatly stimulated by GA but is inhibited by IAA.”
e1“3 to 7-day-old Avena sativa seedlings”
Claim · model-written summary
Low IAA concentrations nearly eliminated GA stimulation of first-leaf base growth.
- Taxon
- Avena sativaAvena sativae2
- Treatment
- IAA (0.01 p.p.m.)e0
- Outcome
- growth of the first-leaf basee1
- Direction
- virtually eliminatede0
- Comparator
- GA (up to 1 0 p.p.m.)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the stimulatory effect of GA (up to 1 0 p.p.m.) may be virtually eliminated by even low concentrations of IAA (0.01 p.p.m.).”
e1“growth of the first-leaf base”
e2“3 to 7-day-old Avena sativa seedlings”
Claim · model-written summary
Including first internode tissue increased first-leaf base growth.
- Taxon
- Avena sativaAvena sativae1
- Treatment
- inclusion of first internode tissuee0
- Outcome
- growth of first leaf base tissuee0
- Direction
- increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inclusion of first internode tissue in the segments considerably increases the growth of first leaf base tissue”
e1“3 to 7-day-old Avena sativa seedlings”
Claim · model-written summary
Including first internode tissue had no consistent effect on coleoptile base growth.
- Taxon
- Avena sativaAvena sativae1
- Treatment
- inclusion of first internode tissuee0
- Outcome
- growth of coleoptile base tissuee0
- Direction
- no consistent effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The inclusion of first internode tissue in the segments considerably increases the growth of first leaf base tissue but has no consistent effect on the growth of coleoptile base tissue.”
e1“3 to 7-day-old Avena sativa seedlings”
Claim · model-written summary
First internode tissue greatly increased GA stimulation of first-leaf base growth.
- Taxon
- Avena sativaAvena sativae1
- Treatment
- presence of first internode tissuee0
- Outcome
- degree of growth stimulation invoked by GAe0
- Direction
- greatly increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The presence of first internode tissue also greatly increases the degree of growth stimulation invoked by GA”
e1“3 to 7-day-old Avena sativa seedlings”
Claim · model-written summary
First internode tissue did not influence the degree of IAA inhibition.
- Taxon
- Avena sativaAvena sativae1
- Treatment
- presence of first internode tissuee0
- Outcome
- degree of IAA inhibitione0
- Direction
- does not influencee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The presence of first internode tissue also greatly increases the degree of growth stimulation invoked by GA but does not influence the degree of IAA inhibition.”
e1“3 to 7-day-old Avena sativa seedlings”
Claim · model-written summary
The authors propose an unknown growth factor from first internode tissue as necessary for GA action in the first leaf.
- Taxon
- Avena sativaAvena sativae1
- Outcome
- GA action in the first leafe0
- Qualifier
- unknown growth factore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“first internode tissue is the source of an unknown growth factor necessary for GA action in the first leaf and potentiating the action of endogenous gibberellin.”
e1“3 to 7-day-old Avena sativa seedlings”
Claim · model-written summary
The tested named compounds did not reproduce the proposed growth-factor effect in leaf tissue.
- Taxon
- Avena sativaAvena sativae1
- Treatment
- Kinetin, adenine sulphate, glutarnine, glutarnic acid, asparagine, glycine, arginine, histidine, lysine, aneurin, and pyridoxinee0
- Outcome
- growth of leaf tissuee0
- Direction
- will not simulatee0
- Comparator
- unknown growth factore0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kinetin, adenine sulphate, glutarnine, glutarnic acid, asparagine, glycine, arginine, histidine, lysine, aneurin, and pyridoxine will not simulate the effects of this unknown growth factor in the growth of leaf tissue.”
e1“3 to 7-day-old Avena sativa seedlings”
Claim · model-written summary
Kinetin virtually eliminated GA stimulation of leaf growth.
- Taxon
- Avena sativaAvena sativae1
- Treatment
- kinetine0
- Outcome
- GA stimulation of leaf growthe0
- Direction
- virtually eliminatese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Like IAA, kinetin virtually eliminates the GA stimulation of leaf growth.”
e1“3 to 7-day-old Avena sativa seedlings”
Claim · model-written summary
First-internode extracts showed growth inhibitors and gibberellin-like substances.
- Taxon
- Avena sativaAvena sativae1
- Organ / stage
- internode tissuee0
- Outcome
- presence of growth inhibitors and gibberellin-like substancese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“extracts of internode tissue in various solvents, analysed by paper partition chromatography and assayed by the growth of the first leaf base, has indicated the presence of growth inhibitors and gibberellin-like substances”
e1“3 to 7-day-old Avena sativa seedlings”
Claim · model-written summary
The extraction and chromatography study did not isolate the postulated endogenous GA synergist.
- Taxon
- Avena sativaAvena sativae1
- Outcome
- failed to isolate the postulated endogenous GA-synergiste0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“has failed to isolate the postulated endogenous GA-synergist.”
e1“3 to 7-day-old Avena sativa seedlings”
The same questions in other papers
indole-3-acetic acid · growth · Avena sativa (oats)Results differ
6 papers in the same direction as this paper · 4 in the opposite direction
- no effect
- negative
- negative
7 papers more in this group
See all 11 papers →kinetin · growth · Avena sativa (oats)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- no effect
Gibberellic acid · growth · Avena sativa (oats)Positive and negative results
16 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
14 papers more in this group
See all 18 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.