00853naa a2200133 a 450000100080000000500110000800800410001910000170006024500640007726000090014152005020015065000160065277300510066816489532023-05-05       1981    bl uuuu     u00u1 u    #d1 aTREWAVAS, A.  aHow do plant growth substances work?h[electronic resource]  c1981  aDespite intensive research effort, the role of growth substances in the life of the intact growing plant is far from clear. Two reasons are suggested which may account for the lack of progress. The first is the failure to recognize the unique aspects of plant development. These which are expressed by the regenerative, organizational and developmental plasticity of the meristem probably result from the possession of growth substances. The second is the concept of growth substances as hormones.  aCrescimento  tPlant Cell and Environmentgv.14, p.1-12 1981.