Plant Hormones Auxin ? stem elongation ? formation of roots ? regulates development of fruits ? enhances apical dominance ? phototropism and gravitropism ? promotes vascular differentiation ? retards leaf abscission ? FOUND IN shoot apical meristems and leaves Gibberellins ? stem elongation ? pollen development ? seed development and germination ? sex determination ? FOUND IN meristems, young leaves, and developing seeds Cytokinins ? regulate cell division ? modify apical dominance ? movement of nutrients ? stimulate seed germination ? delay leaf senescence ? FOUND IN roots, then transported to other organs Brassinosteroids ? cell expansion and division in shoots ? root growth ? promote xylem differentiation ? inhibit phloem differentiation ? seed germination ? pollen tube elongation ? FOUND IN all plant tissues Absciscic Acid ? inhibits growth ? stomatal closure during drought ? seed dormancy ? FOUND IN all tissues Ethylene ? ripening of fruits ? leaf abscission ? triple response ? root and root hair formation ? flowering in pineapples ? FOUND IN all tissues
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