Abstract

PERERA, M. Francisca et al. Los marcadores moleculares TRAP permiten identificar líneas transgénicas de caña de azúcar (Saccharum spp.) genéticamente similares al genotipo sin transformar. Rev. ind. agric. Tucumán [online]. 2020, vol.97, n.1, pp.1-7. ISSN 1851-3018.

Molecular markers could be useful to determine the occurrence of genetic changes during the genetic transformation process. Among them, functional markers randomly distributed throughout the genome may reflect genetic variations of direct interest. For this reason, the objective of this work was to determine similarity to parental genotype of sugarcane of different transgenic events by using Target Region Amplified Polymorphism (TRAP) markers. DNAs from transgenic events, wild type genotypes and other sugarcane varieties were characterized by seven to nine combinations of TRAP primers. Molecular markers were separated by electrophoresis on polyacrylamide denaturing gels in a DNA Analyzer (Li-cor). Amplified fragments were transformed into either a 0/1 matrix. Similarity was calculated by using Jaccard coefficient and dendrograms were generated. At first instance, markers confirmed the preliminary phenotypic evaluations of herbicide resistant events of RA 87-3 variety since transformed events with close growth resemblance to its parental variety exhibited none or only minor genetic changes whereas events with growth aberrations showed a significant degree of polymorphism. The incorporation of other genotypes allowed validating the technique assuring that a significant number of polymorphic bands were analyzed. Considering the accuracy of the methodology, it was routinely applied to characterize transgenic events of LCP 85-384, TUCCP 77-42, TUC 95-10 and TUC 03-12 at early stages of the process. In conclusion, the use of TRAP markers is a quick and recommendable strategy to characterize and identify transgenic events genetically close to their parental genotypes. This makes possible the selection at the first stages of evaluation of those of the most valuable events to carry out field tests.

Keywords : genetic transformation; molecular markers; somaclonal variation.

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