Plant Hormones

auxin

Hormone responsible for cell elongation in response to light and also functions in fruit/pollen development, vascular tissue differentiation, increasing cell wall plasticity, and regulating sensitivity to other hormones

cytokinins

Hormone responsible for cell/organ differentiation in combination with auxin

root development

What is the result of a high auxin:cytokinin ratio (A>C)?

shoot development

What is the result of a low auxin:cytokinin ratio (C>A)?

undifferentiated cells

What is the result of an intermediate auxin:cytokinin ratio (A≈C)?

gibberelins

A group of more than 100 natural hormones synthesized in apical parts of stems/roots which function in stem elongation (in combination with auxin), promote seed germination, and extend internode length

abscisic acid

Hormone synthesized in mature leaves, fruits, and root caps which function in the formation of dormant winter buds, suppresses growth, promotes aging, maintains dormancy, and influences opening/closing of stomata

Brassinosteroids

animal-like hormones with a steroid composition which function in cell elongation/division, stem bending, vascular tissue development, slowed aging, and reproductive development

auxin

What hormone stimulates the production of ethylene

ethylene

Hormone that slows/stunts growth and stem/root elongation, hastens fruit ripening, and promotes leaf breakdown

strigolactones

Carotenoid-derived hormone that inhibits axillary bud growth, affects branching, and regulated vascular cambium in combination with auxin

jasmonates

Hormones that control plant defense systems (wound response) and regulates physiological processes including germination and growth

synthesis, transport, response

list the three stages of plant hormone signaling in order