IFEVA   02662
INSTITUTO DE INVESTIGACIONES FISIOLOGICAS Y ECOLOGICAS VINCULADAS A LA AGRICULTURA
Unidad Ejecutora - UE
artículos
Título:
Genetic diversity among plants of non-transgenic and transgenicversions of a single cross maize hybrid
Autor/es:
LASERNA, M.P.; LÓPEZ, C.G.; ALLUCINO, M.; MADDONNI, G.A.
Revista:
FIELD CROPS RESEARCH
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2015 vol. 176 p. 56 - 60
ISSN:
0378-4290
Resumen:
expressionof several traits (e.g., biomass production, grain yield). We hypothesized that genetic diversity couldinfluence the phenotypic variation among hybrids of a same genetic background and also among plantsof a hybrid. The objectives of this preliminary study were: (i) to quantify the genetic diversity betweenthe non-transgenic (DK747) and transgenic versions (DK747MG, DK747RR and DK747MGRR) of a single-cross maize hybrid and among plants of each version, (ii) to observe the distribution of genetic diversityalong the genome and (iii) to explore relationships between phenotypic variability and genetic diversity.Hybrids were cultivated at field conditions during two growing seasons and plants of each hybrid withhigh, intermediate and low biomass at physiological maturity were selected to perform a study of singlenucleotide polymorphisms (SNP). Genetic diversity among plants of each version was greater than amongversions and both sources of variation were significant (˚ST= 0.45, P < 0.01). Genetic diversity of the non-transgenic DK747 was higher than those of the transgenic versions, probably reflecting the conventionalbreeding history of these iso-hybrids. Similarity coefficients indicate that the most homogeneous groupwas that composed by plants of DK747MGRR. A Fisher?s exact test together with a principal componentanalysis identified certain SNPs related to the contrasting plant biomass of DK747, 747MG and DK747RR.Caution should be taken with these results, because of the small sample size for SNPs study and thenarrow set of tested hybrids.