Plant Hormones Flashcards

1
Q

Plant growth regulator

A

plant hormone used to manipulate plant growth (height, flowering)

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2
Q

Auxins

A

the group of hormones that help plants make roots, essential for plant growth, division, and expansion
-Induces formation of xylem and phloem
-Induces tissue regeneration after wound
-Stimulates root growth
-Required for fruit growth
-Delays senescence
-Inhibits abscission

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3
Q

Rooting hormones

A

IAA, IBA, WAA (too much will inhibit growth! Always tap off)

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4
Q

Cytokinin

A

-promotes cell division in roots and shoots
-involved in cell differentiation
-regulates development of roots and leaves
-Synthesized in roots, cambium and other dividing tissue
-Travels up from roots to shoots
-Signals lateral bud growth
-Delays leaf senescence
-Involved in seeds breaking dormancy
-Stimulates leaf expansion

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5
Q

High auxin and low cytokinin

A

roots form

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6
Q

Equal auxin and cytokinin

A

maintain

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7
Q

Low auxin and high cytokinin

A

shoots form

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8
Q

Apical dominance

A

auxin from the apical bud diffuses down, inhibits growth of lateral buds

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9
Q

Removing the apical bud

A

removes inhibition on lateral buds

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10
Q

Ethylene

A

gas that naturally occurs in plants and promotes abscission
-Influences tissue growth
-Fruit ripening
-Fruit and leaf abscission
-Senescence
-Rapid stem growth (helping seedlings emerge into the sun

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11
Q

Abscisic Acid

A

once through to effect abscission
-Stimulates production of seed storage proteins
-Prevents premature germination
-In drought, roots synthesize and release this acid to reduce transpiration

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12
Q

Gibberellins

A

present throughout plant, highest concentration in immature seeds
-Stem and leaf elongation
-Breaking seed dormancy (can be a substitute for cold or light requirements)

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13
Q

What hormones promote abscission?

A

Ethylene and auxin

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