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The Crosstalk between Cytokinin and Auxin Signaling Pathways in the Control of Natural Senescence of Arabidopsis thaliana Leaves

Authors
  • Danilova, M. N.1
  • Doroshenko, A. S.1
  • Kudryakova, N. V.1
  • Klepikova, A. V.2, 3
  • Shtratnikova, V. Yu.4
  • Kusnetsov, V. V.1
  • 1 Timiryazev Institute of Plant Physiology, Moscow, 127276, Russia , Moscow (Russia)
  • 2 Skolkovo Institute of Science and Technology, Moscow, 143026, Russia , Moscow (Russia)
  • 3 Institute for Information Transmission Problems, Moscow, 127051, Russia , Moscow (Russia)
  • 4 Belozersky Research Institute of Physical and Chemical Biology, Moscow, 119234, Russia , Moscow (Russia)
Type
Published Article
Journal
Russian Journal of Plant Physiology
Publisher
Pleiades Publishing
Publication Date
Oct 18, 2020
Volume
67
Issue
6
Pages
1028–1035
Identifiers
DOI: 10.1134/S1021443720060035
Source
Springer Nature
Keywords
License
Yellow

Abstract

AbstractNatural senescence of leaves is a regular physiological process subjected to a certain genetic program and controlled by various phytohormones. Cytokinins (CKs) play a crucial role in the leaf-senescence control being negative regulators of this process. We previously reported on the prolonged vegetative growth and the development of a double knockout ahk2ahk3 mutant of Arabidopsis thaliana Heynh. (L.) for the genes encoding CK receptors. According to the data of the transcriptomic analysis and real-time RT‑PCR of selected genes performed in this study, the delay of leaf senescence in ahk2ahk3 mutants is accompanied by enhanced (4–281-fold) expression of the group of SAUR (small auxin-up RNA) genes encoding auxin response proteins and by upregulation of the SSPP (senescence-suppressed protein phosphatase) gene, whose expression level significantly (137-fold) exceeded that in a wild-type transcriptome. Thus, it is quite possible that under significant inhibition of the CK signaling leaf senescence in Arabidopsis plants regulated via a compensatory mechanism connected with changes in the expression of the SAUR gene family and a certain pool of genes related to the auxin transport and signaling.

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