Growth and Development of Horticultural Crops (1+1)

Transport of auxin in plant

• The transport of auxin in plant is predominantly polar. In stems, polar transport of auxin is basipetal i.e., it takes place from apex towards base.
  
• In roots also, the auxin transport is polar but is primarily acropetal.
  
• Jacobs (1961) found polar transport of auxin in coleus stem sections to be both basipetal and acropetal in the ratio of 3:1.
  
• According to Audus (1959) some of the auxin synthesized by leaves may be transported to other plant parts through phloem in a rather non-polar manner.
  
• Phototropic and geotrophic movements indicate towards lateral transport of auxins in stem tip and root tip respectively.