Abstract
The elongation of roots of wheat ( Triticum aestivum L. cv. Diamant II), flax ( Linum usitatissimum L. cv. Concurrent) and cucumber ( Cucumis sativus L. cv. Favör) seedlings in the dark was strongly inhibited by various native and synthetic cytokinins (kinetin, benzyladenine, isopentenyladenine, zeatin and their corresponding 9‐ribosides). An inhibition of 50% was obtained for wheat roots with 3 · 10 −9 M zeatin and for flax roots with 6 · 10 −9 M isopentenyladenine. The ribosides were in all cases less inhibitory. The inhibition was reversed by various types of ‘antiauxins’ and ‘antiethylenes’ (such as structural auxin analogues, uncouplers, specific inhibitors of ethylene synthesis, free radical scavengers, inhibitors of ethylene action). These substances as a rule counteract also inhibitions caused by auxins. Auxins and cytokinins stimulate ethylene production synergistically, and the similar inhibitory effects of these two types of hormone can be understood if it is assumed that their effect is at least partly mediated through ethylene. The cytokinins must be considered as possible natural inhibitors and regulators of root growth.
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Claims 10
Claim · model-written summary
Various native and synthetic cytokinins strongly inhibited root elongation of wheat seedlings in the dark.
- Taxon
- wheat
Triticum aestivume1 - Treatment
- various native and synthetic cytokininse1
- Outcome
- elongation of rootse1
- Direction
- inhibitede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The elongation of roots of wheat ( Triticum aestivum L. cv. Diamant II), flax ( Linum usitatissimum L. cv. Concurrent) and cucumber ( Cucumis sativus L. cv. Favör) seedlings in the dark was strongly inhibited by various native and synthetic cytokinins”
Claim · model-written summary
Various native and synthetic cytokinins strongly inhibited root elongation of flax seedlings in the dark.
- Taxon
- flax
Linum usitatissimume1 - Treatment
- various native and synthetic cytokininse1
- Outcome
- elongation of rootse1
- Direction
- inhibitede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The elongation of roots of wheat ( Triticum aestivum L. cv. Diamant II), flax ( Linum usitatissimum L. cv. Concurrent) and cucumber ( Cucumis sativus L. cv. Favör) seedlings in the dark was strongly inhibited by various native and synthetic cytokinins”
Claim · model-written summary
Various native and synthetic cytokinins strongly inhibited root elongation of cucumber seedlings in the dark.
- Taxon
- cucumber
Cucumis sativuse1 - Treatment
- various native and synthetic cytokininse1
- Outcome
- elongation of rootse1
- Direction
- inhibitede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The elongation of roots of wheat ( Triticum aestivum L. cv. Diamant II), flax ( Linum usitatissimum L. cv. Concurrent) and cucumber ( Cucumis sativus L. cv. Favör) seedlings in the dark was strongly inhibited by various native and synthetic cytokinins”
Claim · model-written summary
3 · 10 −9 M zeatin gave 50% inhibition of wheat root elongation.
- Taxon
- wheatTriticum aestivume2
- Treatment
- 3 · 10 −9 M zeatine2
- Compound
- zeatine2
- Outcome
- inhibitione2
- Direction
- inhibitione2
- Value
- 50%e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“An inhibition of 50% was obtained for wheat roots with 3 · 10 −9 M zeatin and for flax roots with 6 · 10 −9 M isopentenyladenine”
Claim · model-written summary
6 · 10 −9 M isopentenyladenine gave 50% inhibition of flax root elongation.
- Taxon
- flaxLinum usitatissimume2
- Treatment
- 6 · 10 −9 M isopentenyladeninee2
- Compound
- isopentenyladeninee2
- Outcome
- inhibitione2
- Direction
- inhibitione2
- Value
- 50%e2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“An inhibition of 50% was obtained for wheat roots with 3 · 10 −9 M zeatin and for flax roots with 6 · 10 −9 M isopentenyladenine”
Claim · model-written summary
Cytokinin ribosides were in all cases less inhibitory of root elongation than the parent cytokinins.
- Taxon
- wheatTriticum aestivume1
- Treatment
- ribosidese3
- Outcome
- less inhibitorye3
- Direction
- lesse3
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The elongation of roots of wheat ( Triticum aestivum L. cv. Diamant II), flax ( Linum usitatissimum L. cv. Concurrent) and cucumber ( Cucumis sativus L. cv. Favör) seedlings in the dark was strongly inhibited by various native and synthetic cytokinins”
e3“The ribosides were in all cases less inhibitory”
Claim · model-written summary
Antiauxins and antiethylenes reversed the inhibition of root elongation by cytokinins.
- Taxon
- wheatTriticum aestivume1
- Treatment
- antiauxinse4
- Outcome
- The inhibitione4
- Direction
- reversede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The elongation of roots of wheat ( Triticum aestivum L. cv. Diamant II), flax ( Linum usitatissimum L. cv. Concurrent) and cucumber ( Cucumis sativus L. cv. Favör) seedlings in the dark was strongly inhibited by various native and synthetic cytokinins”
e4“The inhibition was reversed by various types of ‘antiauxins’ and ‘antiethylenes’”
Claim · model-written summary
Antiauxins and antiethylenes counteract also the inhibitions caused by auxins.
- Taxon
- wheatTriticum aestivume1
- Treatment
- These substancese5
- Outcome
- inhibitions caused by auxinse5
- Direction
- counteracte5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The elongation of roots of wheat ( Triticum aestivum L. cv. Diamant II), flax ( Linum usitatissimum L. cv. Concurrent) and cucumber ( Cucumis sativus L. cv. Favör) seedlings in the dark was strongly inhibited by various native and synthetic cytokinins”
e5“These substances as a rule counteract also inhibitions caused by auxins”
Claim · model-written summary
The similar inhibitory effects of auxins and cytokinins may be partly mediated through ethylene.
- Taxon
- wheatTriticum aestivume1
- Outcome
- similar inhibitory effects of these two types of hormonee6
- Qualifier
- at least partly mediated through ethylenee6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The elongation of roots of wheat ( Triticum aestivum L. cv. Diamant II), flax ( Linum usitatissimum L. cv. Concurrent) and cucumber ( Cucumis sativus L. cv. Favör) seedlings in the dark was strongly inhibited by various native and synthetic cytokinins”
e6“the similar inhibitory effects of these two types of hormone can be understood if it is assumed that their effect is at least partly mediated through ethylene”
Claim · model-written summary
Auxins and cytokinins stimulate ethylene production synergistically.
- Taxon
- wheatTriticum aestivume1
- Treatment
- Auxins and cytokininse7
- Outcome
- ethylene productione7
- Direction
- stimulatee7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“The elongation of roots of wheat ( Triticum aestivum L. cv. Diamant II), flax ( Linum usitatissimum L. cv. Concurrent) and cucumber ( Cucumis sativus L. cv. Favör) seedlings in the dark was strongly inhibited by various native and synthetic cytokinins”
e7“Auxins and cytokinins stimulate ethylene production synergistically”
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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.