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The Effect of Different Temperature Treatments on Dynamic Changes of Endogenous Hormones and Flower-bud Differentiation of 'Green World' Cattleya

  • Received Date: 2009-03-04
  • The changes of endogenous hormones in the new leaves of Cattleya during the flower-bud differentiation phase with 3 temperature treatments were determined by ELISA. The results indicated that:(1) The flower-bud differentiation was significantly accelerated under the treatment of 25 ℃/20 ℃, which was normal under treatment of 30 ℃/25 ℃ and inhibited under treatment of 35 ℃/30 ℃;(2) The contents of GA3, ZR, and ABA were promoted while IAA was inhibited under the treatments of 25 ℃/20 ℃ and 30 ℃/25 ℃. It was opposite under the treatment of 35 ℃/30 ℃. The low contents of GA3, ZR, ABA and high content of IAA were not good for flower-bud differentiation;(3) The rates of GA3/IAA and GA3/ZR kept stable under the treatment of 35 ℃/30 ℃ which was not good for flower-bud differentiation. Lower rates of IAA/ZR and IAA/ABA was required to keep the flower-bud differentiation continuing.
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The Effect of Different Temperature Treatments on Dynamic Changes of Endogenous Hormones and Flower-bud Differentiation of 'Green World' Cattleya

  • 1. Research Institute of Forestry, Chinese Academy of Forestry
  • 2.  Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Beijing 100091, China

Abstract: The changes of endogenous hormones in the new leaves of Cattleya during the flower-bud differentiation phase with 3 temperature treatments were determined by ELISA. The results indicated that:(1) The flower-bud differentiation was significantly accelerated under the treatment of 25 ℃/20 ℃, which was normal under treatment of 30 ℃/25 ℃ and inhibited under treatment of 35 ℃/30 ℃;(2) The contents of GA3, ZR, and ABA were promoted while IAA was inhibited under the treatments of 25 ℃/20 ℃ and 30 ℃/25 ℃. It was opposite under the treatment of 35 ℃/30 ℃. The low contents of GA3, ZR, ABA and high content of IAA were not good for flower-bud differentiation;(3) The rates of GA3/IAA and GA3/ZR kept stable under the treatment of 35 ℃/30 ℃ which was not good for flower-bud differentiation. Lower rates of IAA/ZR and IAA/ABA was required to keep the flower-bud differentiation continuing.

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