Abstract
The action of ethylene on the capacity of plant tissues to metabolize cyanide to beta-cyanoalanine was examined. Beta-cyanoalanine synthase (EC 4.4.1.9) catalyzes the reaction between cyanide and cysteine to form beta-cyanoalanine and hydrogen sulfide. Levels of beta-cyanoalanine synthase activity in tissues of 6 day old etiolated pea (Pisum sativum) seedlings were enhanced severalfold by 1 microliter per liter ethylene. The promotive effect of ethylene increased with increasing ethylene concentrations from 0.01 to 100 microliters per liter and with the period of exposure from 3 to 24 hours. Ethylene enhanced beta-cyanoalanine synthase activity in all regions of the seedling (shoots and roots, internodal regions, cotyledons). The promotive effect was eliminated by norbornadiene, a competitive inhibitor of ethylene action. Levels of beta-cyanoalanine synthase in seedlings of four other dicots (Phaseolus aureas, Glycine max, Lactuca sativa, Sinapis arvensis) and two monocots (Hordeum vulgares, Triticum aestivum) were also increased in response to ethylene. Our results suggest an important regulatory role for ethylene in the metabolism of cyanide by higher plants.
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Claims 12
Claim · model-written summary
Ethylene increased beta-cyanoalanine synthase activity severalfold in six-day etiolated pea seedlings.
- Taxon
- pea (Pisum sativum)
Lathyrus oleraceuse0 - Organ / stage
- 6 day old etiolated pea (Pisum sativum) seedlingse0
- Treatment
- 1 microliter per liter ethylenee0
- Gene
- beta-cyanoalanine synthasee0
- Outcome
- beta-cyanoalanine synthase activitye0
- Direction
- enhancede0
- Value
- severalfolde0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Levels of beta-cyanoalanine synthase activity in tissues of 6 day old etiolated pea (Pisum sativum) seedlings were enhanced severalfold by 1 microliter per liter ethylene”
Claim · model-written summary
The promotive effect rose as ethylene concentration increased from 0.01 to 100 microliters per liter.
- Taxon
- pea (Pisum sativum)Lathyrus oleraceuse1
- Treatment
- ethylenee0
- Outcome
- promotive effect of ethylenee0
- Direction
- increasede0
- Qualifier
- 0.01 to 100 microliters per litere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The promotive effect of ethylene increased with increasing ethylene concentrations from 0.01 to 100 microliters per liter”
e1“pea (Pisum sativum) seedlings”
Claim · model-written summary
The promotive effect rose with exposure duration from 3 to 24 hours.
- Taxon
- pea (Pisum sativum)Lathyrus oleraceuse2
- Treatment
- ethylenee1
- Outcome
- promotive effect of ethylenee1
- Direction
- increasede1
- Qualifier
- 3 to 24 hourse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with the period of exposure from 3 to 24 hours”
e1“The promotive effect of ethylene increased with increasing ethylene concentrations”
e2“pea (Pisum sativum) seedlings”
Claim · model-written summary
Ethylene increased synthase activity in shoots and roots, internodes and cotyledons.
- Taxon
- pea (Pisum sativum)Lathyrus oleraceuse1
- Organ / stage
- shoots and roots, internodal regions, cotyledonse0
- Treatment
- Ethylenee0
- Outcome
- beta-cyanoalanine synthase activitye0
- Direction
- enhancede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ethylene enhanced beta-cyanoalanine synthase activity in all regions of the seedling (shoots and roots, internodal regions, cotyledons)”
e1“pea (Pisum sativum) seedlings”
Claim · model-written summary
Norbornadiene eliminated the promotive effect of ethylene.
- Taxon
- pea (Pisum sativum)Lathyrus oleraceuse1
- Treatment
- norbornadienee0
- Outcome
- promotive effecte0
- Direction
- eliminatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The promotive effect was eliminated by norbornadiene, a competitive inhibitor of ethylene action”
e1“pea (Pisum sativum) seedlings”
Claim · model-written summary
Ethylene increased beta-cyanoalanine synthase in Phaseolus aureas seedlings.
Not reportedComparator
Verbatim
e0“Levels of beta-cyanoalanine synthase in seedlings of four other dicots (Phaseolus aureas, Glycine max, Lactuca sativa, Sinapis arvensis) and two monocots (Hordeum vulgares, Triticum aestivum) were also increased in response to ethylene”
Claim · model-written summary
Ethylene increased beta-cyanoalanine synthase in Glycine max seedlings.
- Taxon
- Glycine max
Glycine maxe0 - Treatment
- ethylenee0
- Outcome
- beta-cyanoalanine synthasee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Levels of beta-cyanoalanine synthase in seedlings of four other dicots (Phaseolus aureas, Glycine max, Lactuca sativa, Sinapis arvensis) and two monocots (Hordeum vulgares, Triticum aestivum) were also increased in response to ethylene”
Claim · model-written summary
Ethylene increased beta-cyanoalanine synthase in Lactuca sativa seedlings.
- Taxon
- Lactuca sativa
Lactuca sativae0 - Treatment
- ethylenee0
- Outcome
- beta-cyanoalanine synthasee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Levels of beta-cyanoalanine synthase in seedlings of four other dicots (Phaseolus aureas, Glycine max, Lactuca sativa, Sinapis arvensis) and two monocots (Hordeum vulgares, Triticum aestivum) were also increased in response to ethylene”
Claim · model-written summary
Ethylene increased beta-cyanoalanine synthase in Sinapis arvensis seedlings.
- Taxon
- Sinapis arvensis
Mutarda arvensise0 - Treatment
- ethylenee0
- Outcome
- beta-cyanoalanine synthasee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Levels of beta-cyanoalanine synthase in seedlings of four other dicots (Phaseolus aureas, Glycine max, Lactuca sativa, Sinapis arvensis) and two monocots (Hordeum vulgares, Triticum aestivum) were also increased in response to ethylene”
Claim · model-written summary
Ethylene increased beta-cyanoalanine synthase in Hordeum vulgares seedlings.
Not reportedComparator
Verbatim
e0“Levels of beta-cyanoalanine synthase in seedlings of four other dicots (Phaseolus aureas, Glycine max, Lactuca sativa, Sinapis arvensis) and two monocots (Hordeum vulgares, Triticum aestivum) were also increased in response to ethylene”
Claim · model-written summary
Ethylene increased beta-cyanoalanine synthase in Triticum aestivum seedlings.
- Taxon
- Triticum aestivum
Triticum aestivume0 - Treatment
- ethylenee0
- Outcome
- beta-cyanoalanine synthasee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Levels of beta-cyanoalanine synthase in seedlings of four other dicots (Phaseolus aureas, Glycine max, Lactuca sativa, Sinapis arvensis) and two monocots (Hordeum vulgares, Triticum aestivum) were also increased in response to ethylene”
Claim · model-written summary
The authors infer a regulatory role for ethylene in cyanide metabolism of higher plants.
- Taxon
- higher plantsEmbryophytae0
- Compound
- ethylenee0
- Outcome
- metabolism of cyanidee0
- Qualifier
- important regulatory rolee0
Verbatim
e0“Our results suggest an important regulatory role for ethylene in the metabolism of cyanide by higher plants”
The same questions in other papers
ethene · physiology: enzyme activity · Lathyrus oleraceus (pea)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
ethene · molecular: metabolites · Lactuca sativa (garden lettuce)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
ethene · molecular: metabolites · Triticum aestivum (wheat)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- negative
- positive
ethene · molecular: metabolites · Glycine max (soybean)Positive and negative results
6 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
4 papers more in this group
See all 8 papers →ethene · molecular: metabolites · Hordeum vulgare (barley)Results agree
1 paper in the same direction as this paper
- positive
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.