4.7 Article

Plant Growth Regulators INCYDE and TD-K Underperform in Cereal Field Trials

期刊

PLANTS-BASEL
卷 10, 期 11, 页码 -

出版社

MDPI
DOI: 10.3390/plants10112309

关键词

cytokinin; TD-K; thidiazuron; INCYDE; CPPU; isopentenyl transferase; IPT; cytokinin oxidase/dehydrogenase; CKX; wheat; barley; yield

资金

  1. Foundation for Arable Research, New Zealand
  2. Ministry of Education, Youth and Sports of the Czech Republic through the European Regional Development Fund-Project 'Plants as a tool for sustainable global development' [CZ.02.1.01/0.0/0.0/16_019/0000827]

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The use of plant growth regulators to enhance wheat and barley yields by altering cytokinin levels showed no significant improvement, potentially due to the inability to change yield components. Analysis of endogenous cytokinin content revealed slight changes under specific conditions.
Using plant growth regulators to alter cytokinin homeostasis with the aim of enhancing endogenous cytokinin levels has been proposed as a strategy to increase yields in wheat and barley. The plant growth regulators INCYDE and CPPU inhibit the cytokinin degrading enzyme cytokinin oxidase/dehydrogenase (CKX), while TD-K inhibits the process of senescence. We report that the application of these plant growth regulators in wheat and barley field trials failed to enhance yields, or change the components of yields. Analyses of the endogenous cytokinin content showed a high concentration of trans-zeatin (tZ) in both wheat and barley grains at four days after anthesis, and statistically significant, but probably biologically insignificant, increases in cisZ-O-glucoside, along with small decreases in cZ riboside (cZR), dihydro Z (DHZ), and DHZR and DHZOG cytokinins, following INCYDE application to barley at anthesis. We discuss possible reasons for the lack of efficacy of the three plant growth regulators under field conditions and comment on future approaches to manipulating yield in the light of the strong homeostatic mechanisms controlling endogenous cytokinin levels.

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