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Growth Regulators & Plant Hormones. Summon Chomchai, MD Toxbuster@hotmail.com. Growth regulator & plant hormone:. Growth regulator : noun Date: 1936 : any of various synthetic or naturally occurring plant substances (as an auxin or gibberellin) that regulate growth

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growth regulators plant hormones

Growth Regulators & Plant Hormones

Summon Chomchai, MD

Toxbuster@hotmail.com

growth regulator plant hormone
Growth regulator & plant hormone:
  • Growth regulator : noun Date: 1936: any of various synthetic or naturally occurring plant substances (as an auxin or gibberellin) that regulate growth
  • Plant hormone: nounDate: 1935: an organic substance other than a nutrient that in minute amounts modifies a plant physiological process; especially: one produced by a plant and active elsewhere than at the site of production
  • Merriam-Webster Online Dictionary
growth regulators plant hormones in thailand
Growth regulators & Plant hormones in Thailand
  • Hydrogen cyanamide
  • Ethephon
  • Cyclocel
  • Thiourea
  • Naphylene-1-acetic acid
  • Gibberellic acids
hydrogen cyanamide dormex
Hydrogen cyanamide (Dormex®)
  • The only hazardous growth regulator reported on MEDLINE!!!
  • Stimulates bud breaking after dormancy
  • Applied by spraying
  • Mode of exposure: skin and inhalation
hydrogen cyanamide
Hydrogen cyanamide
  • Mode of exposure: skin and inhalation
  • Inhibits aldehyde dehydrogenase (disulfiram-like effects)
  • Causes acetaldehyde syndrome when exposure coincided with alcohols
hydrogen cyanamide1
Hydrogen cyanamide
  • 23 cases reported from Italy (MMWR October 5, 2001)
  • 22 cases from occupational exposure: mixing & applying
  • 1 unintentional ingestion
  • PPE status was unknown
hydrogen cyanamide2
Hydrogen cyanamide
  • Eye and respiratory tract irritation
  • Skin symptoms
  • Systemic symptoms: tachycardia, palpitation, headache, dizziness, weakness, nausea and vomiting, dyspnea, hypotension
  • 12 workers were hospitalized
cyanamide other potential health risks
Cyanamide: other potential health risks
  • Contact dermatitis
  • Hepatitis and liver failure
  • Aplastic anemia/ agranulocytosis
  • Disulfiram-like effects
surveillance for hydrogen cyanamide
Surveillance for hydrogen cyanamide
  • Skin symptoms and signs
  • Complete blood count
  • Liver function test
  • Other symptoms
cyanamide control of exposure
Cyanamide: control of exposure
  • Personal protective equipment
    • Chemical-resistant suit
    • Chemical-resistant gloves
    • Chemical-resistant footwear
    • Eye and face protection
    • Respirator with organic vapor removing cartridge
ethephon
Ethephon
  • Enhances releasing of ethylene by plants and fruits
    • fruit ripening
    • flower induction
    • stem elongation
    • stimulate latex flow in rubber)
  • Applied by dipping or spraying
ethephon health effects
Ethephon: health effects
  • Exposure: dermal or inhalation
  • Eye irritation; corneal erosion
  • Severe skin burns; may result in contractures
  • Lower respiratory tract irritation: bronchospasm, pneumonitis, pulmonary edema
ethephon1
Ethephon
  • Decontamination & supportive care, no specific treatment
  • Protection: Personal protective equipment
    • Chemical-resistant suit
    • Chemical-resistant gloves
    • Chemical-resistant footwear
    • Eye and face protection
    • Respirator with organic vapor removing cartridge
cyclocel chlormequat
Cyclocel (Chlormequat)
  • Prevents premature fruit drop in oranges and mangos
  • Increases yields in wheat
  • Promotes lateral branching and flowering in geraniums
cyclocel chlormequat1
Cyclocel (Chlormequat)
  • Dermal contact of dust and sprays, especially during application
  • Contact dermatitis
  • Supportive care/ no specific treatment
  • Protection: Protective clothing and gloves
thiourea
Thiourea
  • Stimulates sprouting from dormant tubers
  • Dermal exposure upon mixing and application
  • Irritant contact dermatitis / photo-contact dermatitis (rubber industry/ silver & copper cleaners)
  • Supportive care/ no specific treatment
  • Protection: Protective clothing and gloves
naphthalene 1 acetic acid
NAPHTHALENE-1-ACETIC ACID
  • Stimulates root formation
  • Prevents premature fruit drop in apples, mangoes, watermelons, pineapples, cucumbers, cotton, soya
  • Controls regrowth of tree sprouts after trimming of lemon, pomegranate
  • Inhibits sprouting in stored potato, ornamental bulbs
  • Application: dipping or spraying
naphthalene 1 acetic acid1
NAPHTHALENE-1-ACETIC ACID
  • Expoure though inhalation during application
  • Nasal irritation
  • Supportive care, no specific treatment
gibberellic acids
Gibberellic acids
  • No health hazard of gibberellic acids reported
  • Prevention: avoid contact with the chemical, wash splash from skin immediately
conclusion
Conclusion
  • Most of growth regulators and plant hormones are relatively benign.
  • Researches on health hazards of growth regulators and plant hormones