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Early blight is one of the most common and destructive tomato disease and it is caused by the fungus Alternaria solani. The aim of this paper was to screen the reaction of ten tomato genotypes (collection of the Institute of Field and Vegetable Crops) against natural infection of early blight. Tested genotypes showed significant differences in the disease occurrence on leaves but not on fruits. However, at the biochemical level, total phenolics (TP), tannins (TT), flavonoids (TF) and antioxidant activity in tomato fruits was significantly affected by genotype, disease occurrence and interaction of these two factors. According to obtained results, content of these secondary metabolites could be used as a one of the parameters in the evaluation of tomato resistance to EB.

The paper analyzes experimental hybrids of early cabbage developed at the Institute of Field and Vegetable Crops in the previous period. The hybrids were tested together for two years and then one (H17) was chosen and submitted to the Variety Commission of the Republic of Serbia. In 2011, the experimental hybrid H17 was officially released as an early cabbage hybrid and registered under the name of NS Mendo F1. The hybrid had been developed by crossing two early lines, one of which was sterile. It is characterized by a short growing season - 65 days from transplanting to harvest. The head weight ranges from 2.5 to 3.5 kg depending on the cultural practice applied. The head is light green in color, sweet-tasting, and suitable for fresh consumption. The hybrid’s traits that contributed significantly to the formation of the first principal component were in fact those that the breeders attach most importance to in their breeding programs. These are the traits that directly influence the market value of a new hybrid and make a given hybrid recognizable on the market. Most notable among such traits are head weight and the weight of the useful part of the head., U radu su analizirani eksperimentalni hibridi ranog kupusa stvoreni u prethodnom periodu u Institutu za ratarstvo i povrtarstvo. Hibridi su međusobno dve godine testirani, iz čega je jedan hibrid (H17) izabran i prijavljen Republičkoj sortnoj komisiji. 2011 godine je eksperimentalni hibrid H17 i zvanično priznat kao rani hibrid kupusa, te registrovan pod imenom NS Mendo F1. Navedeni rani hibrid je nastao ukrštanjem dve linije kupusa, od kojih je jedna sterilna linija. Karakteriše se kratkom dužinom vegetacije, tj. 65 dana od rasađivanja do berbe. Masa glavice se kreće od 2,5 kg do 3,5 kg u zavisnosti od agrotehnike. Glavica je svetlo zelene boje, slatkog ukusa pogodna za svežu potrošnju. Osobine koje su pokazale značajan udeo na formiranje varijabilnosti prve glavne komponente, su u stvari i osobine na koje selekcionari daju i najveći značaj u oplemenjivačkim programima. To su svojstva koja direktno utiču na formiranje tržišne vrednosti novi hibrida, i čine pojedine hibride prepoznatljive na tržištu. To se odnosi pre svega na masu glavice i masu korisnog dela glavice.

Tomato (Lycopersicum esculentum Mill.) is vegetable which could be produced and consumed in a many different ways, due to its variability, made by breeding programs. Variability of analyzed genotypes was determinated for further fruit traits: average mass, fruit shape, locules number and dry matter content. Variability source structure was determinated using principal components analysis (PCA). Three main components, which explain 94,2 % of total variability, were chosen for further analysis. The biggest part of the first main component has fruit shape and locule number. The second component is determinated by dry matter content, and the third by the fruit mass. For more precisely perception of homology and divergence between analyzed genotypes, nonhierarchical grouping analysis (k-means) was performed, and genotypes were divided into three groups. Divergency was determinated for fruit mass and locule number, while for index shape and dry matter contetent analyzed genotypes are homologous. The aim of this study is to examine tomato genotypes variability for fruit traits., Paradajz (Lycopersicum esculentum Mill.) se odlikuje raznolikošću načina proizvodnje i upotrebe, zahvaljujući varijabilnosti koju čovek stvara oplemenjivanjem. Varijabilnost ispitivanih genotipova paradajza analizirana je za sledeće osobine ploda: prosečna masa, oblik, broj komora i sadržaj suve materije. Struktura izvora varijabilnosti određena je primenom metode glavnih komponenata (PCA). Za dalju analizu odabrano je tri glavne komponente, kojima je objašnjeno 94,2% ukupne varijabilnosti. Najveći udeo u prvoj glavnoj komponenti imaju oblik ploda i broj komora. Druga glavna komponenta definisana je sadržajem suve materije dok je masa ploda izdvojena u treću glavnu komponentu. U cilju jasnijeg sagledavanja sličnosti i razlika između genotipova paradajza, primenjena je nehijerarhijska analiza grupisanja (k-means), sa podelom genotipova u tri grupe. Utvrđeno je da se ispitivani genotipovi razlikuju u masi ploda i broju komora, dok su po obliku ploda i sadržaju suve materije sličniji. Cilj rada je ispitivanje varijabilnosti genotipova paradajza za osobine ploda.