Lecithin gels in cyclohexane have been studied by NMR spectroscopy with a multinuclear approach.\ud A precise correlation exists between previously published1-4 shear viscosity, a macroscopic property, and\ud the line width of the 31P NMR resonance. At constant waterllecithin ratio ( WO = 8) near the condition\ud of maximal shear viscosity, the 3lP spin-spin relaxation time as a function of lecithin concentration defines\ud the range in which a gel-forming condition is present. Light scattering data i.e. hydrodynamic and gyration\ud radii6 at low lecithin concentration as a function of WO match extremely well the corresponding 3lP line\ud width curve. During the gel formation process water mobility increases and, contrary to the expectation\ud based on the established model, no evidence of fatty chains entanglement is found. Instead a marked\ud stiffening of the trigliceride moiety and the phosphate is found, while the polar head and the fatty chains\ud do not show loss in mobility

Abbreviations: MAS, marker-assisted selection; OR, odds ratio; QTL, quantitative trait locus/loci.

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Mal de Río Cuarto virus (MRCV) is one of the most devastating pathogens in maize (Zea mays L.) causing serious yield loss in susceptible cultivars in Argentina. An effective solution to control the virus is to use resistant genes to improve the behavior of susceptible genotypes. The goals of this work are to identify simple sequence repeats (SSR) linked to quantitative trait loci (QTL), for resistance to MRCV, and to validate QTL found in previous research with different genetic backgrounds. Two hundred and eight F 2:3 families derived from a cross between a susceptible inbred line, B73, and a resistant inbred line, LP116, were evaluated across three environments in the disease-endemic region. Disease incidence (INC), disease severity (SEV) and disease severity index (DSI) were employed to evaluate F 2:3 families. Based on this segregant population, ninety-eight simple sequence repeat (SSR) markers selected from 173 markers were used. The means of all measured traits followed near-normal distribution; therefore these traits may be considered as quantitatively inherited characters. For INC, SEV and DSI all estimates showed a moderate heritability ranging from 0,33 to 0,72. Some quantitative trait loci (QTL), each explaining around 10% of phenotypic variance were found on chromosome 1, 6, 8 and 10. The identification of QTL conferring resistance to MRCV may contribute to breeding programs seeking to protect the crop through improved genetic resistance.