PlantHormones - REGULATION OF PLANT GROWTH BY...

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REGULATION OF PLANT GROWTH BY HORMONE~ (Chapter 28; Table 28-1; Table 28-2) Hormone - organic substance produced in one tissue and transported to another tissue where it causes a physiological response; typically are active in small quantities and are very specific in the response they cause or tissue acted upon. *Internal messenger (chemical) that interacts with external environmental factors to control the growth of the plant body. *There are GROWTH-PROMOTING HORMONES and GROWTH-INHIBITING HORMONES AUXIN - first plant hormone to be studied -naturally occurring in the form of lAA (indole acetic acid) -produced in: shoot tips, seeds, fruits, leaves, stems (NOT roots) -ATP expenditure to transport auxin from shoot tips "downward" -Growth-promoting hormone *Effects on Plant Growth: 1) promotes cell elongation 2) promotes shoot elongation 3) promotes production of wood 4 ) promotes production of roots in cutt~ngs 5) promotes fruit development 6) inhibits abscission (dropping) of leaves, fruits, flowers 7) inhibits lateral bud
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