Silicon promotes cytokinin biosynthesis and delays senescence in Arabidopsis and Sorghum

Oshry Markovich, Evyatar Steiner, Štěpán Kouřil, Petr Tarkowski, Asaph Aharoni, Rivka Elbaum*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

97 Scopus citations

Abstract

Silicate minerals are dominant soil components. Thus, plant roots are constantly exposed to silicic acid. High silicon intake, enabled by root silicon transporters, correlates with increased tolerance to many biotic and abiotic stresses. However, the underlying protection mechanisms are largely unknown. Here, we tested the hypothesis that silicon interacts with the plant hormones, and specifically, that silicic acid intake increases cytokinin biosynthesis. The reaction of sorghum (Sorghum bicolor) and Arabidopsis plants, modified to absorb high versus low amounts of silicon, to dark-induced senescence was monitored, by quantifying expression levels of genes along the senescence pathway and measuring tissue cytokinin levels. In both species, detached leaves with high silicon content senesced more slowly than leaves that were not exposed to silicic acid. Expression levels of genes along the senescence pathway suggested increased cytokinin biosynthesis with silicon exposure. Mass spectrometry measurements of cytokinin suggested a positive correlation between silicon exposure and active cytokinin concentrations. Our results indicate a similar reaction to silicon treatment in distantly related plants, proposing a general function of silicon as a stress reliever, acting via increased cytokinin biosynthesis.

Original languageAmerican English
Pages (from-to)1189-1196
Number of pages8
JournalPlant, Cell and Environment
Volume40
Issue number7
DOIs
StatePublished - Jul 2017

Bibliographical note

Publisher Copyright:
© 2017 John Wiley & Sons Ltd

Keywords

  • Arabidopsis
  • cytokinin
  • senescence
  • silicon
  • sorghum

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