Thidiazuron
Names
IUPAC name
1-Phenyl-3-(1,2,3-thiadiazol-5-yl)urea
Other names
TDZ
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.052.125
EC Number
  • 257-356-7
  • InChI=1/C9H8N4OS/c14-9(12-8-6-10-13-15-8)11-7-4-2-1-3-5-7/h1-6H,(H2,11,12,14)/f/h11-12H
  • C1=CC=C(C=C1)NC(NC2=CN=NS2)=O
Properties
C9H8N4OS
Molar mass 220.25 g·mol−1
Appearance White powder
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Thidiazuron (TDZ) is a plant growth regulator.[1]

Applications

Plant growth regulator

The synthesis routes and their use as plant growth regulating agent were patented in the early 1980s by the German company Schering AG. Thidiazuron is taken up by the leaves and has a cytokinin-like behavior.[2] It causes leaves to lose weight in a controlled manner prior to harvesting, without affecting the growth and maturation of the plant. This facilitates mechanical harvesting. It also accelerates the maturation process, because leaves do not block the sunlight. The plants later develop normal foliage. Thidiazuron can also be used as a herbicide, because an appropriate dose and timing of administration completely stops growth.

The product was marketed by Aventis CropScience; later merged into Bayer CropScience. Brand names are Dropp (for use in the cultivation of cotton) or Revent (for use in fruit production). Dropp Ultra, Dropp UltraMax and Ginstar are products with a mixture of thidiazuron and diuron.

Preservative

Researchers found that thidiazuron is suitable for extending the life of cut flowers.[3][4] The substance slows down or prevents the wilting of the leaves.

Regulatory

European Union

In 2008, the European Union banned the use of thiadiazuron in agriculture. It was one of the agricultural chemicals in the framework of the European Pesticides Directive 91/414 / EEC that must have an environmental and health assessment to obtain a new authorization.[5] An outdated substance is an active substance which was already on the market in the European Union on July 25, 1993, before the action step of the directive. Existing stocks could still be used afterwards for one year.[5]

Thidiazuron is still used in other parts of the world, including in the United States, Australia, and Mexico.

Toxicology and safety

Thidiazuron is mildly acutely toxic, irritating to skin and eyes, and may cause respiratory irritation if inhaled.[6]

References

  1. ↑ Murthy, B. N. S.; Murch, S. J.; Saxena, Praveen K. (1998). "Thidiazuron: A potent regulator ofin vitro plant morphogenesis". In Vitro Cellular & Developmental Biology - Plant. 34 (4): 267–275. doi:10.1007/BF02822732. S2CID 25979100.
  2. ↑ Huetteman, Carl A.; Preece, John E. (1993). "Thidiazuron: A potent cytokinin for woody plant tissue culture". Plant Cell, Tissue and Organ Culture. 33 (2): 105–119. doi:10.1007/BF01983223. S2CID 28573585.
  3. ↑ Ferrante, Antonio; Mensuali-Sodi, Anna; Serra, Giovanni (2009). "Effect of thidiazuron and gibberellic acid on leaf yellowing of cut stock flowers". Open Life Sciences. 4 (4): 461–468. doi:10.2478/s11535-009-0039-8. hdl:11382/102944. S2CID 26487232.
  4. ↑ Ferrante, A.; Tognoni, F.; Mensuali-Sodi, A.; Serra, G. (2003). "Treatment with Thidiazuron for Preventing Leaf Yellowing in Cut Tulips and Chrysanthemum". Acta Horticulturae (624): 357–363. doi:10.17660/ActaHortic.2003.624.49.
  5. 1 2 "EUR-Lex - 32008D0296 - EN - EUR-Lex".
  6. ↑ PubChem. "Thidiazuron". pubchem.ncbi.nlm.nih.gov. Retrieved 2022-02-27.
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