Regulation of root formation by auxin-ethylene interaction in pea stem cuttings |
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Authors: | Ann-Caroline Nordström Lennart Eliasson |
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Institution: | Dept of Botany, Univ. of Stockholm, S-106 91 Stockholm, Sweden. |
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Abstract: | The possibility was investigated that the inhibition of rooting in pea ( Pisum sativum L. cv. Weibull's Marma) cuttings caused by low indol-3yl-acetic acid (IAA) concentrations is due to ethylene produced as a result of IAA treatment. Treatment with 10 uμ IAA reduced the number of roots to about 50% of the control and increased ethylene production in the stem bases by about 20 times the control value during the two first days of treatment. Ethylene-releasing compounds (ethephon and 1-amino-cyclopropane-1-carboxylic acid, ACC), in concentrations giving a similar ethylene release, inhibited rooting to the same extent or more strongly than IAA. These results indicate that IAA-induced ethylene is at least responsible for the negative component in IAA action on root formation in pea cuttings. A higher IAA concentration (100 μ) and indol-3yl-butyric acid efficiently counteracted the negative effect of ethylene on root formation. |
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Keywords: | 1-Aminocydopropane-l-carboxylic acid ethephon indol-3yl-acetic acid indol-3yl-butyric acid Pisum sativum |
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