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
Compositional characteristics of seven lines of tomatoes have been determined. The following parameters were evaluated: dry matter, acidity (citric acid equivalent), Ca-pectate, ash, cellulose, sugars (total, reducing sugars, sucrose), mineral substances (N, P, K, Ca, Na), surface color and carotenoid content. From a compositional viewpoint, there were no significant differences between lines, but in cellulose, sucrose, mineral substances, carotenoid content, and surface colour parameters, a*, b*, L and h°.
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. [Projekat Ministarstva nauke Republike Srbije, br.
43007: Studying climate change and its influence on the environment: impacts,
adaptation and mitigation]
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