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Plant Hormones ...plant hormones are endogenous organic compounds active at very low concentration, produced in one tissue, and translocated to another point in the plant where their effects on growth and development are manifested. • Plant "hormones" are sometimes preferentially referred to as plant growth regulators(PGR) because they differ from animal hormones in the following ways: • Plant hormones are not made in specialized tissues • Plant hormones do not have specific target tissues • Plant hormones usually do not have specific effects • auxin (indoleacetic acid)• cytokinins (zeatin, zeatin riboside, isopentenyl adenine)• gibberellins (GAx...80)• abscisic acid (ABA)• ethylene• others (real and fabled; jasmonic acid, brassinolide, florigen, juvenone)Class Endogenous Hormone Growth Regulators auxin indoleacetic acid IBA, NAA, 2,4-D, others cytokinin zeatin, zeatin riboside kinetin, BA, 2iP, TDZ gibberellin GA x...80 GA3, GA4+7abscisic acid abscisic acid (ABA) ethylene ethylene Ethephon, Ethrel Auxin (indoleacetic acid)......produced in apical and root meristems, young leaves, seeds in developing fruits. |
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نوشته شده در شنبه بیست و پنجم مهر ۱۳۸۸ساعت 21:25 توسط
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