Growth regulators plant hormones
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Growth Regulators & Plant Hormones. Summon Chomchai, MD [email protected] 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

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Growth regulators plant hormones

Growth Regulators & Plant Hormones

Summon Chomchai, MD

[email protected]


Growth regulator plant hormone

Growth regulator & plant hormone:

  • Growth regulator : nounDate: 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


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