Abstract
Eliasson, L. and Bollmark, M. 1988. Ethylene as a possible mediator of light‐induced inhibition of root growth. ‐ Physiol. Plant. 72: 605–609. Pea seedlings ( Pisum sativum L. cv. Weibull's Marma) were used to investigate the possible role of ethylene in light‐induced inhibition of root elongation. Illumination of the roots with white light inhibited root elongation by 40–50% and increased ethylene production by the roots about 4‐fold. Our main approach was to use exogenous 1‐aminocyclopropane‐1‐carboxylic acid (ACC), supplied in the growth solution, to monitor ethylene production of the roots independent of light treatment. Ethylene production of excised root tips increased with increasing ACC concentrations. The rate of ethylene production in dark‐grown roots treated with 0.1 μ M ACC was similar to that caused by illumination. Low ACC concentrations (0.01–0.1 μ M ) decreased the rate of root elongation, especially in seedlings grown in the dark, and 0.1 μ M ACC inhibited elongation to about the same extent as light. In light the roots curved and grew partly plagiogravitropically. This effect was also simulated by the 0.1 μ M ACC treatment. At 1 μ M and higher concentrations, ACC inhibited root growth almost completely and caused conspicuous curvatures of the root tips both in light and darkness. Inhibitors of ethylene synthesis and action partially counteracted the inhibition of root elongation caused by light. These observations suggest that the increase in ethylene production caused by light is at least partly responsible for the decreased growth of light‐exposed roots.
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Claims 12
Claim · model-written summary
White light inhibited pea root elongation by 40–50%.
- Taxon
- Pea seedlings
Lathyrus oleraceuse0 - Material
- Pisum sativum L. cv. Weibull's Marmae0
- Treatment
- white lighte1
- Outcome
- root elongatione1
- Direction
- inhibitede1
- Value
- 40–50%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea seedlings ( Pisum sativum L. cv. Weibull's Marma) were used to investigate the possible role of ethylene in light‐induced inhibition of root elongation.”
e1“Illumination of the roots with white light inhibited root elongation by 40–50%”
Claim · model-written summary
White light increased root ethylene production about fourfold.
- Taxon
- Pea seedlingsLathyrus oleraceuse0
- Outcome
- ethylene production by the rootse1
- Direction
- increasede1
- Value
- 4‐folde1
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea seedlings ( Pisum sativum L. cv. Weibull's Marma)”
e1“increased ethylene production by the roots about 4‐fold”
Claim · model-written summary
Ethylene production from excised root tips rose with ACC concentration.
- Taxon
- Pea seedlingsLathyrus oleraceuse0
- Treatment
- ACC concentrationse1
- Outcome
- Ethylene production of excised root tipse1
- Direction
- increasede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea seedlings ( Pisum sativum L. cv. Weibull's Marma)”
e1“Ethylene production of excised root tips increased with increasing ACC concentrations.”
Claim · model-written summary
Dark grown roots given 0.1 μ M ACC produced ethylene at a rate similar to illuminated roots.
- Taxon
- Pea seedlingsLathyrus oleraceuse0
- Treatment
- 0.1 μ M ACCe1
- Outcome
- rate of ethylene productione1
- Direction
- similare1
- Comparator
- illuminatione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea seedlings ( Pisum sativum L. cv. Weibull's Marma)”
e1“The rate of ethylene production in dark‐grown roots treated with 0.1 μ M ACC was similar to that caused by illumination.”
Claim · model-written summary
Low ACC concentrations decreased root elongation, especially in darkness.
- Taxon
- Pea seedlingsLathyrus oleraceuse0
- Treatment
- Low ACC concentrations (0.01–0.1 μ M )e1
- Outcome
- rate of root elongatione1
- Direction
- decreasede1
- Qualifier
- especially in seedlings grown in the darke1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea seedlings ( Pisum sativum L. cv. Weibull's Marma)”
e1“Low ACC concentrations (0.01–0.1 μ M ) decreased the rate of root elongation, especially in seedlings grown in the dark”
Claim · model-written summary
ACC at 0.1 μ M inhibited root elongation about as much as light.
- Taxon
- Pea seedlingsLathyrus oleraceuse0
- Treatment
- 0.1 μ M ACCe1
- Outcome
- elongatione1
- Direction
- inhibitede1
- Comparator
- lighte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea seedlings ( Pisum sativum L. cv. Weibull's Marma)”
e1“0.1 μ M ACC inhibited elongation to about the same extent as light.”
Claim · model-written summary
Roots curved and partly grew plagiogravitropically in light.
- Taxon
- Pea seedlingsLathyrus oleraceuse0
- Treatment
- lighte1
- Outcome
- roots curved and grew partly plagiogravitropicallye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea seedlings ( Pisum sativum L. cv. Weibull's Marma)”
e1“In light the roots curved and grew partly plagiogravitropically.”
Claim · model-written summary
ACC at 0.1 μ M simulated the curvature response to light.
- Taxon
- Pea seedlingsLathyrus oleraceuse0
- Treatment
- 0.1 μ M ACC treatmente1
- Outcome
- This effecte1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea seedlings ( Pisum sativum L. cv. Weibull's Marma)”
e1“This effect was also simulated by the 0.1 μ M ACC treatment.”
Claim · model-written summary
ACC at 1 μ M and above nearly completely inhibited root growth.
- Taxon
- Pea seedlingsLathyrus oleraceuse0
- Treatment
- 1 μ M and higher concentrations, ACCe1
- Outcome
- root growthe1
- Direction
- inhibitede1
- Qualifier
- almost completelye1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea seedlings ( Pisum sativum L. cv. Weibull's Marma)”
e1“At 1 μ M and higher concentrations, ACC inhibited root growth almost completely”
Claim · model-written summary
ACC at 1 μ M and above caused conspicuous root tip curvatures in light and darkness.
- Taxon
- Pea seedlingsLathyrus oleraceuse0
- Treatment
- 1 μ M and higher concentrations, ACCe1
- Outcome
- conspicuous curvatures of the root tipse1
- Qualifier
- both in light and darknesse1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea seedlings ( Pisum sativum L. cv. Weibull's Marma)”
e1“At 1 μ M and higher concentrations, ACC inhibited root growth almost completely and caused conspicuous curvatures of the root tips both in light and darkness.”
Claim · model-written summary
Ethylene synthesis and action inhibitors partly counteracted light inhibition of root elongation.
- Taxon
- Pea seedlingsLathyrus oleraceuse0
- Treatment
- Inhibitors of ethylene synthesis and actione1
- Outcome
- inhibition of root elongation caused by lighte1
- Direction
- counteractede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea seedlings ( Pisum sativum L. cv. Weibull's Marma)”
e1“Inhibitors of ethylene synthesis and action partially counteracted the inhibition of root elongation caused by light.”
Claim · model-written summary
Authors infer that light induced ethylene contributes to reduced root growth.
- Taxon
- Pea seedlingsLathyrus oleraceuse0
- Outcome
- decreased growth of light‐exposed rootse1
- Direction
- decreasede1
- Qualifier
- increase in ethylene production caused by lighte1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pea seedlings ( Pisum sativum L. cv. Weibull's Marma)”
e1“the increase in ethylene production caused by light is at least partly responsible for the decreased growth of light‐exposed roots.”
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