Biologia plantarum 54:6-12, 2010 | DOI: 10.1007/s10535-010-0002-6

Organogenesis and Agrobacterium tumefaciens-mediated transformation of Eucalyptus saligna with P5CS gene

R. Dibax1, C. Deschamps1, J. C. Bespalhok Filho1, L. G. E. Vieira2, H. B. C. Molinari2, M. K. F. De Campos2, M. Quoirin3,*
1 Department of Plant Science, Federal University of Parana, Curitiba, Brazil
2 Plant Biotechnology Laboratory, IAPAR, Londrina, Brazil
3 Department of Botany, Federal University of Parana, Curitiba, Brazil

The purpose of this research was Eucalyptus saligna in vitro regeneration and transformation with P5CSF129A gene, which encodes Δ1-pyrroline-5-carboxylate synthetase (P5CS), the key enzyme in proline biosynthesis. After selection of the most responsive genotype, shoot organogenesis was induced on leaf explants cultured on a callus induction medium (CI) followed by subculture on a shoot induction medium (SI). Shoots were subsequently cultured on an elongation medium (BE), then transferred to a rooting medium and finally transplanted to pots and acclimatized in a greenhouse. For genetic transformation, a binary vector carrying P5CSF129A and uidA genes, both under control of the 35SCaMV promoter, was used. Leaves were co-cultured with Agrobacterium tumefaciens in the dark on CI medium for 5 d. The explants were transferred to the selective callogenesis inducing medium (SCI) containing kanamycin and cefotaxime. Calli developed shoots that were cultured on an elongation medium for 14 d and finally multiplied. The presence of the transgene in the plant genome was demonstrated by PCR and confirmed by Southern blot analysis. Proline content in the leaves was four times higher in transformed than in untransformed plants while the proline content in the roots was similar in both types of plants.

Keywords: abiotic stress; in vitro culture; PCR; proline; Southern blot
Subjects: Agrobacterium tumefaciens; auxins; cytokinins; Eucalyptus saligna; ex vitro transfer; in vitro culture, callus; in vitro culture, rooting; polymerase chain reaction (PCR); proline biosynthesis; Southern blot analysis; transgenic plants

Received: March 19, 2008; Accepted: September 1, 2008; Published: March 1, 2010Show citation

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Dibax, R., Deschamps, C., Filho, J.C., Vieira, L.G.E., Molinari, H.B.C., Campos, M.K.F., & Quoirin, M. (2010). Organogenesis and Agrobacterium tumefaciens-mediated transformation of Eucalyptus saligna with P5CS gene. Biologia plantarum, 54(1), 6-12. doi: 10.1007/s10535-010-0002-6.
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