Abstract

TOCHO, Érica et al. Caracterización de la resistencia al pulgón verde de los cereales (Schizaphis graminum) en cultivares de cebada bajo condiciones controladas. RIA. Rev. investig. agropecu. [online]. 2019, vol.45, n.2, pp.182-190. ISSN 1669-2314.

In order to identify sources of resistance to Schizaphis graminum, main pests affecting winter cereals, commercial varieties and experimental lines of barley were evaluated under laboratory conditions. Plant tolerance to greenbug feeding was assessed by measuring dry air weight loss and chlorophyll content in infested plants compared with respective not infested controls. In addition, genotypes were classified by damage insect done after a period of infestation, using a scale of 1 to 9, where 1 = plant without damage and 9 = dead plant. Genotypes with values from 1 to 3 were considered resistant plants, from 4 to 6 moderately resistant to moderately susceptible and from 7 to 9 susceptible. Genotypes antibiotics effect was determined by longevity and fecundity of the insects. Significant differences in resistance to S. graminum among evaluated germplasm were found. Among them, Quilmes Carisma, Sylphide, Sunshine and LE 3 (experimental line) were the most tolerant to aphid feed, and Sylphide showed antibiotic effect. However, these varieties are not most representative barley production in Argentina. Meanwhile, Andreia, Shakira and Scarlett were characterized as susceptible or moderately susceptible and these varieties are most representative barley production in Argentina. The results shown the importance of knowing the resistance to a particular pest, due it can be a conditioning factor in choice of varieties especially in regions where the pest can generate important damages. In addition, information obtained represents a valuable resource to be used in breeding programs in the search for cultivars with genetic resistance to green aphid from cereals.

Keywords : Hordeum vulgare; aphids; resistance.