Ethylene is involved in the actin cytoskeleton rearrangement during the root gravitropic response of Arabidopsis thaliana

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• 作者：G. A. Pozhvanov ; A. E. Gobova ; M. P. Bankin…
• 刊名：Russian Journal of Plant Physiology
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：63
• 期：5
• 页码：587-596
• 全文大小：1,218 KB
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Physiology
  Plant Sciences
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1608-3407
• 卷排序：63

文摘

Gravitropism, the directed plant growth with respect to the gravity vector, is regulated by auxin and its polar transport system, several secondary messengers, and by the cytoskeleton. Recently we have shown that the actin cytoskeleton in the root transition zone of Arabidopsis thaliana (L.) Heynh was rearranged after gravistimulation (rotation by 90°): the fraction of axially aligned microfilaments decreased and the fraction of oblique and transversally-oriented microfilaments increased. In the present research we have studied the effect of ethylene and inhibitors of its synthesis on actin cytoskeleton rearrangement during the gravitropic response. Application of the ethylene releasing substance ethephon to A. thaliana seedlings led to the disassembly of actin microfilaments as well as their broad angle distribution in cells of the root transition zone. This actin rearrangement was escaped by treatment with the ethylene synthesis inhibitor aminoethoxyvinylglycine (AVG). Another negative regulator of ethylene, salicylic acid, was shown to disturb actin microfilament rearrangement as well. We conclude that ethylene is essential for the process of actin cytoskeleton rearrangement in root cortex cells during the gravitropic bending response.KeywordsArabidopsis thalianagravitropismethylenecytoskeletonactinrootelongation zoneethephonsalicilyc acidaminoethoxyvinylglycine