JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2016, Vol. 59 ›› Issue (05): 191-196.doi: 10.3969/j.issn.1000-2006.2016.05.030

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Effects of NAA treatment on the endogenous hormone changes in cuttings of Carya illinoinensis during rooting

WU Wenhao1, CAO Fan2, LIU Zhuangzhuang2, PENG Fangren2*, LIANG Youwang2, TAN Pengpeng2   

  1. 1. Jurong Forestry Science and Technology Extension Center, Jurong City Forestry Bureau of Jiangsu Province, Zhenjiang 212400, China;
    2. Co-Innovation Center for Sustainable Forestry in Southern China, College of Forestry, Nanjing Forestry University, Nanjing 210037, China
  • Online:2016-10-18 Published:2016-10-18

Abstract: This experiment used 1-year-old pecan dormant branches as the hardwood cuttings. One of two trials compared the NAA treatment group and CK controlled group, the other one focused on the different concentrations of NAA treatment groups. Both of them were conducted to study the changes of endogenous hormones in the process of cutting rooting for providing physiological foundation of pecan hardwood cutting research. The results showed that the exogenous hormones treatment changed four endogenous hormone(IAA, ZR, GA and ABA)content of pecan hardwood cuttings in the process of adventitious root formation. ①The endogenous IAA content was relatively low and it was beneficial to the growth of adventitious roots. ②The low concentration of endogenous GA content could delay the bud break of cuttings. ③The low concentration of endogenous ABA content was favorable for the formation of root primordia; High level of endogenous ABA content improved the resistance of cuttings and reduced decay phenomenon. ④The formation and development of callus or the adventitious roots of pecan hard wood cuttings were mainly regulated by the IAA/ZR ratio.

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