Abstract

PERERA, María F. et al. Evaluation of somaclonal variation in in vitro produced sugarcane plants through molecular markers. Rev. ind. agric. Tucumán [online]. 2010, vol.87, n.2, pp.13-21. ISSN 1851-3018.

In vitro culture of plant tissue can produce somaclonal variation, which consists of genetic modifications in cultured cells and tissues. This may constrain the use of this technique in massive micropopagation, especially if such change causes an agronomically relevant phenotypical modification. In this work, a methodology based on the comparison of AFLP (Amplified Fragment Length Polymorphism) molecular marker profiles was developed for detecting somaclonal variation in in vitro propagated sugarcane plants. To optimize AFLP technique application to sugarcane plants, six conventionally propagated genotypes and two types of samples (tender leaves and meristems) were used. Somaclonal variation was determined in micropropagated lines of these genotypes after six months of micropropagation. Molecular profile differentiation of the selected genotypes was achieved with 19 primer combinations. Differential profiles were detected in LCP85-384 and TUCCP77-42 micropropagated lines with 3 of the 19 primer combinations. This result demonstrated that the technique can be used to detect somaclonal variants and that there are different susceptibility levels to in vitro culture among genotypes. Therefore, micropropagation methodology was adjusted to each multiplied genotype so as to ensure genetic purity of in vitro propagated plants.

Keywords : Micropropagation; Saccharum spp.; AFLP.

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