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Root apical meristems also produce auxin, although the root depends on the shoot for much of its auxin
Developing seeds and fruits ocntain high levels of auxin, but it is unclear whether it is newly synthesized or transported from maternal tissues
These are synthesized primarily in roots and transported to other organs, although there are many minor sites of production as well
Meristems of apical buds and roots, young leaves and developing seeds are the primary sites of production
Stimulates stem elongation, pollen development, pollen tube growth, fruit growth, and seed development and germination
These compounds are present in all plant tissues although different intermediates predominant in different organs
Abscisic acid (ABA)
Almost all plant cells have the ability to synthesize abscisic acid, and its presence has been detected in every major organ and living tissue
These carotenoid-derived hormones and extracellular signals are produced in roots in in response to low phosphate conditions or high auxin flow from the shoot
Promote seed germination control of apical dominance and the attraction of mycorrhizal fungi to the root
It is produced in high concentrations during senescenceleaf abscission, and the ripening of some types of fruit
Promotes ripening of many types of fruit, leaf abscission and the triple response in seedlings (inhibition of stem elongation promotion of lateral expansion and horizontal growth)
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