Plant Hormone Where They are Synthesized and Found Plant Hormones Function •
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Stimulates cell elongation
Stimulates cell division along with CK
Along with CK, suppresses lateral bud growth when supplied
from apical buds (Apical Dominance)
Induces new root formation
Involved in phototropism and gravitropism
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Stimulates cell division along with auxin
Stimulates cell broadening
Stimulates stomatal opening
Promotes chlorophyll synthesis.
Promotes unloading of sugars from phloem Delays leaf senescence (aging)
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Auxin (IAA) This hormone is synthesized in shoot and root meristematic tissue It is synthesized in much greater amounts in the shoots than roots Cytokinin This hormone is synthesized in shoot and root meristematic tissue It is synthesized in much greater amounts in the roots than shoots (CK) Ethylene Ethylene is present in the tissues of ripening fruits, nodes of stems, aging leaves and flowers Abscisic Acid This hormone is produced in stems and leaves. Absicisic acid is found mostly in water-­‐stressed leaves and stems, as well as unripe fruit •
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Stimulates the closing of stomata
Inhibits shoot growth
Inhibits seed germination
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Stimulates stem elongation
Inhibits root growth
Along with auxin, stimulates fruit growth
Ends seed dormancy after imbibition
This hormone is produced in the meristems of apical buds and roots, young leaves, and seed embryos Induces seed germination
Stimulates flower and leaf senescence (aging)
Leaf and fruit abscission (dropping)
Stimulates fruit ripening
Involved in stress responses
o Production of adventitious roots during flooding
o Disease and wound resistance
(ABA) Gibberellin •
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