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Plant growth regulators incyde and td-k underperform in cereal field trials
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SYSNO ASEP 0558348 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Plant growth regulators incyde and td-k underperform in cereal field trials Author(s) van Voorthuizen, M. J. (NZ)
Song, J. (CN)
Novák, Ondřej (UEB-Q) RID, ORCID, SAI
Jameson, P. E. (NZ)Number of authors 4 Article number 2309 Source Title Plants. - : MDPI
Roč. 10, č. 11 (2021)Number of pages 14 s. Language eng - English Country CH - Switzerland Keywords Barley ; ckx ; cppu ; Cytokinin ; Cytokinin oxidase/dehydrogenase ; incyde ; ipt ; Isopentenyl transferase ; td-k ; Thidiazuron ; Wheat ; Yield OECD category Biochemistry and molecular biology R&D Projects EF16_019/0000827 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UEB-Q - RVO:61389030 UT WOS 000807201500001 EID SCOPUS 85117887869 DOI 10.3390/plants10112309 Annotation 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. Workplace Institute of Experimental Botany Contact David Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469 Year of Publishing 2023 Electronic address http://doi.org/10.3390/plants10112309
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