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Acta Agron Sin ›› 2013, Vol. 39 ›› Issue (07): 1276-1283.doi: 10.3724/SP.J.1006.2013.01276

• TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY • Previous Articles     Next Articles

Changes of Hormones in Cultivars and Wild-Type Varieties of Rehmannia glutinosa Libosch.

LI Xian-En1,2,SUN Peng2,QI Jian-Jun2,ZHOU Li-Li2,WANG Shao-Hua1,*   

  1. 1 College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China; 2 Institute of Medicinal Plant Development, China Academy of Medical Science, Peking Union Medical College, Beijing 100094, China
  • Received:2012-06-25 Revised:2013-03-11 Online:2013-07-12 Published:2013-04-23
  • Contact: 王绍华, E-mail: wangsh@njau.edu.cn

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Abstract:

The formation and development of tuberous roots is related to plant endogenous hormones. We determined the contents of IAA, ZR, GA and ABA in leaves and roots of two cultivars and two wild-type varieties of Rehmannia glutinosa during the growth periods and compared their developmental changing trends between cultivars and wild-type varieties of Rehmannia glutinosa. The results showed that the contents of IAA, ZR, and ABA in leaves of cultivated Rehmannia glutinosa were higher than those of wild-type varieties and their changes in both cultivated and wild type of R. glutinosa displayed the same single-peak curves during the growth periods, they were all increased gradually at the elongation and rapid enlargement stages of roots and then decreased gradually. There was no significant developmental change in GA content in the leaves of both cultivated and wild-type varieties. Hormone contents in roots of cultivars had quite different developmental changes from those of wild-type varieties: The contents of IAA, ZR, and ABA in the cultivars presented the changing trend of single-peak curves during root growth periods while GA content increased rapidly in root enlargement stage. There was no much developmental change in IAA and GA contents in roots of wild-type varieties. ZR content decreased gradually with the root development in wild-type varieties. ABA content changed in roots of wild-type varieties displayed a single-peak curve which was much lower than that of the cultivars. This different developmental changes of hormone contents in rehmannia roots between cultivars and wild-type varieties indicated that the development of the rehmannia tuberous roots is affected by synergitic effects of several hormones and that IAA and ZR act on the initiation of tuberous roots, whereas GA and ABA play a more important role in root enlargement and thickening.

Key words: Rehmannia glutinosa Libosch, Cultivar, Wild-type varieties, Hormones

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