Response of maize seedling roots to changing ethylene concentrations |
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Authors: | M?V?Alarcon P?G?Lloret D?J?Iglesias M?Talon Email author" target="_blank">J?SalgueroEmail author |
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Institution: | (1) Departamento de Anatomia, Biologia Celular y Zoologia, Facultad de Ciencias, Universidad de Extremadura, Badajoz, Spain;(2) Departamento de Hortofruticultura, Centro de Investigacion “La Orden-Valdesequera”, Badajoz, Spain;(3) Departamento de Genomica y Postcosecha, Instituto Valenciano de Investigaciones Agrarias, Valencia, Spain;(4) Departamento de Biologia Vegetal, Ecologia y Ciencias de la Tierra, Universidad de Extremadura, E-06071 Badajoz, Spain |
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Abstract: | Maize roots (Zea mays, cv. DK 626) growing in aerated solutions showed striking variations in the amount of ethylene produced during different
stages of development. As endogenous ethylene increases, root elongation decreases. Exogenous 1-aminocyclopropane-1-carboxylic
acid (ACC) supplied to these roots also inhibited their elongation and increased both the fresh weight of the apex and the
ethylene produced. The inhibitor of ethylene biosynthesis, 2-aminoethoxyvinyl glycine (AVG), and the inhibitor of ethylene
action, silver thiosulfate (STS), also reduced growth and increased swelling. As growth diminishes at reduced ethylene concentrations
or with impeded ethylene action, these results support the view that ethylene is necessary for root growth. As ACC treatment
also inhibited root elongation, it appears that ethylene was inhibitory at both low and high concentrations. Whereas ACC stimulated
ethylene production 4 h after the beginning of treatment, inhibition of root elongation and promotion of fresh weight advanced
slowly and needed 24 h to be established. At that time, root elongation reached a maximum response of 60% inhibition and 50%
increase in weight. At 48 h, higher doses of ACC were required to provoke the same response as at 24 h. This suggests that
the root growth progressively accomodates to higher ethylene concentrations.
Published in Russian in Fiziologiya Rastenii, 2009, Vol. 56, No. 4, pp. 539–545.
This text was submitted by the authors in English. |
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Keywords: | Zea mays root elongation ethylene inhibitors ethylene ACC |
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