*AUXIN * . AUXIN (from Greek 'AUXIN':to grow) was frist isolated from human urine The term 'is applied to the indole -3-acetic Acid (IAA) ,and to other natural and synthetic compound having certain growth regulating properties they are generally product by the growing apices of the stems and roots from where they migrate to the region of their action. AUXIN like IAA. and indole butyric acid (IBA) have been isolated from plants. NAA(naphthalene acetic acid) and 2,4-D(2,-4dicholorophenoxyacetic)are synthetic AUXIN all these AUXINS have been used extensive in agriculture and horticulture practice They help to initiate rooting in stem cuttings, an application widely used for plants provocation. Auxins promoted flowering e.g.in pineapples they help to prevent fruit and leaf drop at early stage but promoted the abscission of older mature leave and fruits. In most higher plant ,the growing apical bud inhibits the growth of the leteral...
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