Genetic base broadening in autogamous crops: Lycopersicon esculentum Mill. as a model.

Abstract

This paper analyses the progress to date particularly in relation to the architecture of F2 populations created from interspecific and intraspecific hybridizations of Lycopersicon esculentum, L. esculentum var. cerasiforme, L. hirsutum f.sp. glabratum, L. parviflorum, L. pennellii var. puberulum and L. pimpinellifolium through codominant (microsatellites) and dominant (RAPD) molecular markers, and morphological characters. The possible strategies for conserving the created genetic variability in such an autogamous crop was also studied.

Genetic and cytological diversity in cherry tree accessions ( Eugenia involucrata DC) in Rio Grande do Sul

“…The high genetic similarity of accessions of this study (84%) may be associated with evolutionary and natural selection factors, as well as the opening of new agricultural areas which led to the loss of many plant populations and their reproductive systems. According to Saavedra and Spoor (2002), most species had their diversity reduced as a result of plant domestication, selection and breeding. According to Borém and Miranda (2009), with the opening of new agricultural areas many genotypes were lost, often resulting in the disappearance of local varieties, causing current populations to present narrow genetic bases which can lead to genetic erosion.…”

Genetic diversity among tomato’s subsamples for pre-breeding

“…It is due to the development of cultivars with a limited number of genotypes, among other factors (Saavedra and Spoor 2002).…”