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Scientia Silvae Sinicae ›› 2013, Vol. 49 ›› Issue (7): 143-149.doi: 10.11707/j.1001-7488.20130721

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Effects of Plant Growth Regulators on Growth, Heartwood Formation and Oil Composition of Young Santalum album

Liu Xiaojin, Xu Daping, Yang Zengjiang, Zhang Ningnan   

  1. Research Institute of Tropical Forestry, CAF Guangzhou 510520
  • Received:2012-10-22 Revised:2013-05-21 Online:2013-07-25 Published:2013-07-23

Abstract:

In this paper, we investigated the effects of 4 plant growth regulators (PGRs), including Benzyladenine, Ethrel, Methyl Viologen and Jasmonic acid, on growth, heartwood formation and essential oil composition of young Santalum album through a stem injection method. The results showed that there were no significant differences in heightand DBH growth, but all the above PGRs promoted formation of fragrant heartwood in young sandals, and the heartwood was the same appearance and texture with naturally produced heartwood. There were extremely significant differences (P <0.01) in the amount of induced heartwood among different PGRs treatments, and the rank of the treatment efficiency was in the following order: Methyl Viologen=Ethrel>Benzyladenine=CK>Jasmonic acid. There were significant and extremely significant differences in both relative content (P <0.05) and absolute content (P <0.01) of essential oil distilled from these heartwood among different treatments, of which Benzyladenine treatment yielded the highest relative content and absolute content, and the average content was 5.55% and was 8.77% respectively. The components of essential oil induced by different treatments were nearly the same. However, contents of α-santalol (P <0.05) and β-santalol (P <0.05) were statistically different, ethrel treatment had the highest α-santalol content, with 46.05%, while benzyladenine treatment had the highest β-santalol content, with 23.35%. All treatments, except for jasmonic acid, produced oil which quality met with the ISO standard for S. album oil, indicating that the process of the heartwood formation can be regulated by phytohormones, of which benzyladenine may be one of the most useful phytohormones in controlling heartwood formation of sandal.

Key words: plant growth regulator, Santalum album, heartwood formation, oil composition, oil quality

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