Abstract
Abstract Kinetin promoted the uptake of K + and Rb + into detached sunflower cotyledons. This action was concomitant with an acceleration of growth. A slighter promotion of Li + uptake was also noted, but there was no consistent influence on that of Na + . A small inhibitory effect on NH 4 + 4 uptake was apparent when the latter was computed per average weight of sample during the course of incubation. Light also promoted the growth of the cotyledons, but depressed their capacity to absorb potassium. The action of kinetin on cotyledons removed from 5–7 day old seedlings was weaker than on those removed from 2–4 day old seedlings with regard to growth but stronger with regards to K + uptake. When K + uptake by cotyledons taken from 7‐day old seedlings was followed with time the kinetin effect was already detectable within a few hours, but it became more pronounced after 10 hours' incubation. Kinetin did not accelerate growth or K + uptake in hypo‐cotyl segments. IAA, which was previously shown to promote these processes in hypocotyl segments, inhibited them in cotyledons. A working hypothesis is suggested according to which endogenous auxins and cytokinins regulate the absorption of K + in shoot cells of the intact plant in a manner similar to that in which they act in excised tissues and in this way affect the distribution and redistribution of K + in the shoot; and that they are among the factors which determine the selectivity of ion uptake in the intact plant.
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Claims 12
Claim · model-written summary
Kinetin promoted K and Rb uptake in sunflower cotyledons.
- Taxon
- sunflower
Helianthus annuuse0 - Organ / stage
- cotyledonse0
- Treatment
- Kinetine0
- Outcome
- uptake of K + and Rb +e0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kinetin promoted the uptake of K + and Rb + into detached sunflower cotyledons”
Claim · model-written summary
Kinetin accelerated cotyledon growth.
- Taxon
- SunflowerHelianthus annuust0
- Outcome
- growthe0
- Direction
- acceleratione0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This action was concomitant with an acceleration of growth”
t0“Sunflower Cotyledons”
Claim · model-written summary
Kinetin slightly promoted Li uptake.
- Taxon
- SunflowerHelianthus annuust0
- Outcome
- Li + uptakee0
- Direction
- promotione0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A slighter promotion of Li + uptake was also noted”
t0“Sunflower Cotyledons”
Claim · model-written summary
Kinetin had no consistent effect on Na uptake.
- Taxon
- SunflowerHelianthus annuust0
- Outcome
- Na +e0
- Direction
- no consistent influencee0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no consistent influence on that of Na +”
t0“Sunflower Cotyledons”
Claim · model-written summary
Kinetin weakly inhibited ammonium uptake per average sample weight.
- Taxon
- SunflowerHelianthus annuust0
- Outcome
- NH 4 + 4 uptakee0
- Direction
- inhibitorye0
- Qualifier
- computed per average weight of sample during the course of incubatione0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A small inhibitory effect on NH 4 + 4 uptake was apparent when the latter was computed per average weight of sample during the course of incubation”
t0“Sunflower Cotyledons”
Claim · model-written summary
Light promoted cotyledon growth.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- Lighte0
- Outcome
- growth of the cotyledonse0
- Direction
- promotede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Light also promoted the growth of the cotyledons”
t0“Sunflower Cotyledons”
Claim · model-written summary
Light depressed cotyledon potassium absorption.
- Taxon
- SunflowerHelianthus annuust0
- Outcome
- capacity to absorb potassiume0
- Direction
- depressede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“depressed their capacity to absorb potassium”
t0“Sunflower Cotyledons”
Claim · model-written summary
Kinetin had a weaker growth effect in cotyledons from older seedlings.
- Taxon
- SunflowerHelianthus annuust0
- Organ / stage
- cotyledons removed from 5–7 day old seedlingse0
- Treatment
- kinetine0
- Outcome
- growthe0
- Direction
- weakere0
- Comparator
- 2–4 day old seedlingse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“action of kinetin on cotyledons removed from 5–7 day old seedlings was weaker than on those removed from 2–4 day old seedlings with regard to growth”
t0“Sunflower Cotyledons”
Claim · model-written summary
Kinetin had a stronger K uptake effect in cotyledons from older seedlings.
- Taxon
- SunflowerHelianthus annuust0
- Outcome
- K + uptakee0
- Direction
- strongere0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stronger with regards to K + uptake”
t0“Sunflower Cotyledons”
Claim · model-written summary
Kinetin effect on K uptake was detectable within hours and stronger after 10 hours.
- Taxon
- SunflowerHelianthus annuust0
- Outcome
- kinetin effecte0
- Direction
- more pronouncede0
- Qualifier
- after 10 hours' incubatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“kinetin effect was already detectable within a few hours, but it became more pronounced after 10 hours' incubation”
t0“Sunflower Cotyledons”
Claim · model-written summary
Kinetin did not accelerate hypocotyl growth or K uptake.
- Taxon
- SunflowerHelianthus annuust0
- Organ / stage
- hypo‐cotyl segmentse0
- Treatment
- Kinetine0
- Outcome
- growth or K + uptakee0
- Direction
- did not acceleratee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Kinetin did not accelerate growth or K + uptake in hypo‐cotyl segments”
t0“Sunflower Cotyledons”
Claim · model-written summary
IAA inhibited growth and K uptake in cotyledons.
- Taxon
- SunflowerHelianthus annuust0
- Treatment
- IAAe0
- Outcome
- them in cotyledonse0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“IAA, which was previously shown to promote these processes in hypocotyl segments, inhibited them in cotyledons”
t0“Sunflower Cotyledons”
The same questions in other papers
kinetin · growth · Helianthus annuus (common sunflower)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
kinetin · nutrient: content · Helianthus annuus (common sunflower)Results agree
2 papers in the same direction as this paper
- positive
- positive
light · growth · Helianthus annuus (common sunflower)Positive and negative results
12 papers in the same direction as this paper · 9 in the opposite direction · 1 reporting no difference from an alternative
- negative
- negative
- no effect
19 papers more in this group
See all 23 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.