Abstract
The growth‐retarding activity of the norbornenodiazetine tetcyclacis and the di‐oxanylalkenyl triazole LAB 150 978 as well as the ethylene‐forming compounds 2‐chloroethyl‐phosphonic acid (ethephon) and 1‐amino‐cyclopropane‐l‐carboxylic acid (ACC) on stem histogenesis and ethylene production of sunflower plants ( He‐lianthus annuus L. cv.Spanners Allzweck) has been studied. The shoot growth of plants hydroponically grown and treated was reduced by the compounds. The shortening in the length of the 1st internode caused by tetcyclacis and LAB 150 978 was mainly induced by inhibition of cell division (the internode possessed fewer cortical cells per cell file). In contrast, ethephon and ACC decreased internode elongation mainly by reducing the rate of cell enlargement. The ethylene production of sunflower seedlings cultivated on agar nutrient medium rose with increasing concentrations of ethephon and ACC, the shoot length of the plants being progressively reduced. Tetcyclacis and LAB 150 978 inhibited both the formation of ethylene and shoot growth. It is suggested that in contrast to ethephon and ACC, tetcyclacis and LAB 150 978 do not achieve their growth‐retarding effect by influencing the production of ethylene.
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 7
Claim · model-written summary
The applied compounds reduced shoot growth in hydroponically grown sunflower.
- Taxon
- sunflower plants
Helianthus annuust0 - Treatment
- the compoundse0
- Outcome
- shoot growthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The shoot growth of plants hydroponically grown and treated was reduced by the compounds.”
t0“sunflower plants”
Claim · model-written summary
Tetcyclacis and LAB 150 978 shortened the first internode mainly through inhibited cell division.
- Taxon
- sunflower plantsHelianthus annuust0
- Organ / stage
- 1st internodee0
- Treatment
- tetcyclacis and LAB 150 978e0
- Outcome
- inhibition of cell divisione0
- Direction
- shorteninge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The shortening in the length of the 1st internode caused by tetcyclacis and LAB 150 978 was mainly induced by inhibition of cell division (the internode possessed fewer cortical cells per cell file).”
t0“sunflower plants”
Claim · model-written summary
Ethephon and ACC decreased internode elongation mainly by reducing cell enlargement.
- Taxon
- sunflower plantsHelianthus annuust0
- Treatment
- ethephon and ACCe0
- Outcome
- internode elongatione0
- Direction
- decreasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In contrast, ethephon and ACC decreased internode elongation mainly by reducing the rate of cell enlargement.”
t0“sunflower plants”
Claim · model-written summary
Increasing ethephon and ACC concentrations increased ethylene production in sunflower seedlings.
- Taxon
- sunflower seedlingsHelianthus annuuse0
- Treatment
- increasing concentrations of ethephon and ACCe0
- Outcome
- ethylene productione0
- Direction
- rosee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The ethylene production of sunflower seedlings cultivated on agar nutrient medium rose with increasing concentrations of ethephon and ACC”
Claim · model-written summary
Increasing ethephon and ACC concentrations progressively reduced sunflower shoot length.
- Taxon
- sunflower seedlingsHelianthus annuuse1
- Treatment
- increasing concentrations of ethephon and ACCe1
- Outcome
- shoot lengthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the shoot length of the plants being progressively reduced.”
e1“sunflower seedlings cultivated on agar nutrient medium rose with increasing concentrations of ethephon and ACC”
Claim · model-written summary
Tetcyclacis and LAB 150 978 inhibited ethylene formation and shoot growth.
- Taxon
- sunflower plantsHelianthus annuust0
- Treatment
- Tetcyclacis and LAB 150 978e0
- Outcome
- formation of ethylene and shoot growthe0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tetcyclacis and LAB 150 978 inhibited both the formation of ethylene and shoot growth.”
t0“sunflower plants”
Claim · model-written summary
The authors suggest that tetcyclacis and LAB 150 978 do not retard growth by influencing ethylene production.
- Taxon
- sunflower plantsHelianthus annuust0
- Treatment
- tetcyclacis and LAB 150 978e0
- Outcome
- growth‐retarding effecte0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“It is suggested that in contrast to ethephon and ACC, tetcyclacis and LAB 150 978 do not achieve their growth‐retarding effect by influencing the production of ethylene.”
t0“sunflower plants”
The same questions in other papers
1-aminocyclopropanecarboxylic acid · growth · Helianthus annuus (common sunflower)Positive and negative results
1 paper in the same direction as this paper · 2 in the opposite direction
- positive
- positive
- negative
(2-chloroethyl)phosphonic acid · growth · Helianthus annuus (common sunflower)Positive and negative results
1 paper in the same direction as this paper · 10 in the opposite direction
- positive
- positive
- positive
8 papers more in this group
See all 12 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.