Joint Segregation of High Glanding with Nectariless and Frego Bract in Cotton

There are mutant alleles in the genus Gossypium that increase the tolerance to insect pests. Among the features that are effective against different insects, high glanding and nectariless increase the tolerance to Lepidoptera insects whereas frego bracts difficult the ovipositions of boll weevil Anthonomus grandis Boheman. It is necessary to incorporate these traits in elite genotypes. The objectives of this research were to transfer the high glanding feature to frego-bract and nectariless plants. For the combination high glanding with frego bract, the frequency of individuals with both features varied from 6 % in the F2 generations to 24 % in the F3. For the other combination, high glanding with nectariless, the frequency of recombination was of 7.,3% in the F2 and 11.,8% in the F3. Therefore, it is possible to combine the high-glanding feature with frego bracts or nectariless in the same line.Fil: Tcach, Mauricio Alfredo. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Spoljaric, Mónica V.. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Bela, Diego Alberto. Instituto Nacional de Tecnología Agropecuaria; ArgentinaFil: Acuña, Carlos Alberto. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Botánica del Nordeste. Universidad Nacional del Nordeste. Facultad de Ciencias Agrarias. Instituto de Botánica del Nordeste; Argentin

Habitat complexity modulates phenotype expression through developmental plasticity in the threespine stickleback

The expression of alternative phenotypes within a single species is often considered to be the result of ontogenetic processes and specifically phenotypic plasticity responses to exposure to different environmental conditions. In fish, which have been widely used to test such questions, exposure to different diets is the most frequently described initiator of plastic responses. The effect of physical characteristics of the habitat on fish morphology has not been fully explored. In the present study, a clear effect of habitat complexity on fish shape was found. Threespine sticklebacks were exposed to two different habitat treatments, simple and complex, over a 17-week period. The exposure to the habitats resulted in the expression of very significant differences in body and head morphologies and spine position, showing that the physical environment can modulate the expression of traits through phenotypic plasticity during ontogen