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Plant Growth Responses
Plant response
Brief description
Seed Germination
Break dormancy
Stem elongation
Apical Dominance
Dormancy
Cells (and stems)
elongate; Bolting
Lateral growth is
inhibited in favor
of the shoot apex
Sleepy time
(seasonal and
seeds)
Fruit ripens
Grow to light
Shoot up; root
down
Growth response to
touch
Open and close
Hormone(s) involved
Gibberellins (work in
opposition to Absicisic Acid)
Gibberellins and Auxins
Source of hormone(s)
Loaded into seed during
development.
Roots (Gibberellins); Meristems
(Auxins)
Auxins (inhibit cyctokinins in Apical meristem
axillary meristems)
Absicisic Acid (work in
opposition to Gibberellins)
Roots and leaves
Ethylene gas
Auxins
Auxins
Fruit tissues
Apical meristem(s)
Root meristems
Auxins
Apical meristem(s); tendrils
Absicisic Acid
Leaves
Plant Growth Regulators (Hormones)
Plant Hormone
Where produced
Auxins
Meristems
Target
Stems; axillary buds
Cytokinins
Roots
Meristems
Gibberelins
Roots; seed
embryos
Absicisic Acid
Ethylene
Leaves; roots
Fruit tissue
Stems (elongation); seed
embryos (break
dormancy…counter to
Absicisic Acid)
Leaves; stems
Fruit tissue
Response(s)
Cell elongation; tropisms
(differential cell elongation);
Bolting (elongation associated
with flowering in some plants;
Apical dominance (inhibits
cytokinins)
Cell division…PRIMARY
GROWTH
Stem elongation and seed
germination; break dormancy
Fruit ripening
Phototropism
Gravitropism
Thigmotropism
Stomata control
Stomata control; Dormancy
Ripening