New Forests

, Volume 49, Issue 3, pp 311–327 | Cite as

Agrobacterium-mediated transformation of a Eucalyptus camaldulensis × E. tereticornis hybrid using peeled nodal-stem segments with yeast HAL2 for improving salt tolerance

  • Narumol Thanananta
  • Supachai Vuttipongchaikij
  • Somsak Apisitwanich


Genetic improvements of Eucalyptus require both breeding and gene transformation to generate desirable traits for forest industry. Because most of the current Eucalyptus transformation methods rely on juvenile seedling tissues as explants, the resulting transgenics are subjected to phenotypic segregation through the use of segregated seedlings. This is unsuitable for transformation of selected Eucalyptus breeding lines, especially the interspecific hybrids. Here, we developed an Agrobacterium-mediated transformation method using peeled nodal-stem explants from in vitro-propagated plantlets of a Eucalyptus hybrid. The explant was prepared by peeling off epidermal layers around the axillary buds using a pair of forceps, before co-cultivation with Agrobacterium tumefaciens. Transgenic shoots generated from the axillary buds were then obtained through kanamycin selection. The transformation efficiency was at most 24% as confirmed by PCR and GUS assay. Transformation of a E. camaldulensis × E. tereticornis F1 hybrid clone using yeast HAL2 showed that, out of 35, 11 transgenic plantlets had an increase in salt tolerance and grew and developed roots, though at a slow rate, on the medium supplemented with NaCl up to 300 mM concentration. This work demonstrates the efficiency of this transformation method for further genetic improvement of Eucalyptus clones selected through hybridization and breeding.


Abiotic stress Eucalyptus Genetic engineering Tissue culture Tree biotechnology 



This research was supported by The Graduate School for Thesis and Dissertation, Kasetsart University, Kasetsart University Research and Development Institute (KURDI), and Faculty of Science Research Fund (ScRF).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

11056_2017_9621_MOESM1_ESM.tif (10.7 mb)
Supplementary data Fig. S1 shows vigorous growth of the 24A17 hybrid compared with its parental lines, E. calmaldulensis and E. tereticornis, and other two F1 hybrid lines (TIFF 10966 kb)
11056_2017_9621_MOESM2_ESM.tif (9.1 mb)
Supplementary data Fig. S2 shows growth of the 24A17 hybrid, E. calmaldulensis and E. tereticornis cultivated on the growth medium supplemented with 0, 100, 300 and 500 mM NaCl for 30 days (TIFF 9342 kb)


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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2017

Authors and Affiliations

  1. 1.Faculty of Science and TechnologyValaya Alongkorn Rajabhat University under the Royal PatronageKlong Nuang, Khlong LuangThailand
  2. 2.Department of Genetics, Faculty of ScienceKasetsart UniversityChatuchakThailand
  3. 3.Center of Advanced Studies for Tropical Natural ResourcesKasetsart UniversityChatuchakThailand
  4. 4.School of ScienceMae Fah Luang UniversityChiangraiThailand

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