Abstract
Young excised coleoptiles from dark grown wheat have their cell growth promoted by gibberellic acid (GA 3 ), while sections from older coleoptiles have their cell growth promoted by auxin. The GA 3 response has a much longer lag period than that of auxin. Neither GA 3 nor auxin has any effect on 14 C‐leucine and 14 C‐uridine incorporation and uptake after 1 h, indicating that the lag in growth stimulation following GA 3 application is not associated with changes in protein or RNA synthesis. Following a 6 h incubation there are small increases in 14 C‐leucine and 14 C‐uridine incorporation in response to both GA 3 and auxin, and in the case of auxin this is associated with increased uptake. Studies on protein and RNA turnover using pulse‐chase experiments have shown that both GA 3 and auxin have no effect on protein and RNA stability. There are, however, developmental changes in RNA and protein synthesis that should be considered in any explanation of the mechanism of action of these hormones on cell growth. Young GA 3 ‐sensitive tissue has high rates of RNA synthesis and low protein and RNA turnover, while auxin‐sensitive tissue has low rates of RNA synthesis, slightly higher rates of RNA turnover and much higher rates of protein turnover. The evidence overall favours more effective utilisation by GA 3 and auxin of a basal control level of RNA and protein synthesis and turnover in coleoptile tissue.
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Claims 9
Claim · model-written summary
Gibberellic acid promoted cell growth of young excised wheat coleoptiles.
- Taxon
- wheat
Triticum aestivume0 - Organ / stage
- Young excised coleoptilese0
- Treatment
- gibberellic acid (GA 3 )e0
- Outcome
- cell growthe0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Young excised coleoptiles from dark grown wheat have their cell growth promoted by gibberellic acid (GA 3 )”
Claim · model-written summary
Auxin promoted cell growth in older coleoptile sections.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- older coleoptilese0
- Treatment
- auxine0
- Outcome
- cell growthe0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while sections from older coleoptiles have their cell growth promoted by auxin”
t0“wheat coleoptile”
Claim · model-written summary
GA 3 growth response had a longer lag than auxin.
- Taxon
- wheatTriticum aestivumt0
- Outcome
- lag periode0
- Direction
- much longere0
- Comparator
- auxine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The GA 3 response has a much longer lag period than that of auxin”
t0“wheat coleoptile”
Claim · model-written summary
Neither hormone affected leucine or uridine incorporation and uptake after 1 h.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- GA 3 nor auxine0
- Outcome
- 14 C‐leucine and 14 C‐uridine incorporation and uptakee0
- Direction
- any effecte0
- Qualifier
- after 1 he0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Neither GA 3 nor auxin has any effect on 14 C‐leucine and 14 C‐uridine incorporation and uptake after 1 h”
t0“wheat coleoptile”
Claim · model-written summary
Both hormones slightly increased leucine and uridine incorporation after six hours.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- both GA 3 and auxine0
- Outcome
- 14 C‐leucine and 14 C‐uridine incorporatione0
- Direction
- small increasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Following a 6 h incubation there are small increases in 14 C‐leucine and 14 C‐uridine incorporation in response to both GA 3 and auxin”
t0“wheat coleoptile”
Claim · model-written summary
Auxin increased uptake at six hours.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- auxine0
- Outcome
- uptakee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the case of auxin this is associated with increased uptake”
t0“wheat coleoptile”
Claim · model-written summary
Neither hormone changed protein or RNA stability.
- Taxon
- wheatTriticum aestivumt0
- Treatment
- both GA 3 and auxine0
- Outcome
- protein and RNA stabilitye0
- Direction
- no effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both GA 3 and auxin have no effect on protein and RNA stability”
t0“wheat coleoptile”
Claim · model-written summary
Young GA 3-sensitive tissue had high RNA synthesis and low turnover.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- Young GA 3 ‐sensitive tissuee0
- Outcome
- high rates of RNA synthesis and low protein and RNA turnovere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Young GA 3 ‐sensitive tissue has high rates of RNA synthesis and low protein and RNA turnover”
t0“wheat coleoptile”
Claim · model-written summary
Auxin-sensitive tissue had low RNA synthesis and higher RNA and protein turnover.
- Taxon
- wheatTriticum aestivumt0
- Organ / stage
- auxin‐sensitive tissuee0
- Outcome
- low rates of RNA synthesis, slightly higher rates of RNA turnover and much higher rates of protein turnovere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“auxin‐sensitive tissue has low rates of RNA synthesis, slightly higher rates of RNA turnover and much higher rates of protein turnover”
t0“wheat coleoptile”
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See all 109 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.