Phenotypic mass selection

Phenotypic mass selection in the Vinhos Verdes region... 

Individual plants showing the desired phenotype will be selected and either generatively or vegetatively propagated (individual selection), or positive or negative mass selection techniques... 

Individual plants showing the desired phenotype will be selected and either generatively or veg-etatively propagated (individual selection), or positive or negative mass selection techniques can be applied. Selection is traditionally the most common method of genetic improvement and the majority of varieties and cultivars of essential oil crops have this background. Due to the fact, however, that almost all of the respective plant species are allogamous, a recurrent selection is necessary to maintain the varietal traits, and this has especially to be considered if other varieties or wild populations of the same species are nearby and uncontrolled cross pollination may occur. 

Different tomato phenotypes were analysed for the content of total polyphenols, selected flavonoids, including flavonols (rutin and a rutin-derivative), flavanones (naringenin and the related chalcone) and carotenoids (lycopene and P-carotene). The identity of these conoponents was based on their chromatographic, ultraviolet and mass spectrometric behavior. All phenotypes were surveyed for dieir total antioxidant activity (TAA), and correlations betweens TAA values and the content of each group of constituents. 

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