CHANGES IN LEAF COLOR AND RELATIVE WATER CAPACITY OF LETTUCE (Lactuca sativa L.) DEPENDING ON THE USE OF THE SHADING NET

Lettuce leaf color is a hereditary trait, and among environmental factors, light/radiation and temperature are the two most influential climatic variables. This research is based on the effect of the application of photoselective nets of different densities, that is, with different percentages of shading, on leaf coloration and relative water content (RWC) at lettuce maturation. Three nets with different shading percentages were used, namely green nets with a shade of 50% and 35% and one white net with a shade of 50%, and plants without shading were used as controls. To determine the full effect of the application of nets on the production of summer lettuce, the experiment was conducted in two planting periods: May-June and September-October 2021 with lettuce Zeralda F1 and Abbice F1 in the greenhouse. Colorimetry was performed on three occasions, every seven days, and in the phase when 70% and 80% of the plant mass was reached. Regarding the color of the leaves, it was shown that in the second period of cultivation at the end of the vegetation, a difference in the intensity of the color was found, that is, the net with stronger shading (G50) showed a stronger intensity of lettuce color compared to the other tested variants. RWC was quite different depending on the variant in the first growing period, while in the second growing period, the highest was in the control plants (89.48%) and those under nets with 50% shade (77.69%)

Effects of Salinity on Color Changes, Sugar and Acid Concentration in Tomato Fruit

Tomato (Lycopersicon esculentum, Mill) is vegetable which is relatively resistant to salt concentration in growing substrate. However, research has shown that salinity stress causes changes in the quality of the fruit, which indirectly affects the yield. So the aim of this research was to determine the change in color of ripening fruits, the amount of sugar and acid in the fruit as indicators of the quality of the fruit. Tests were conducted in a greenhouse on tomato cv. Buran F1, where were two varieties of seedlings, grafted and non grafted, grown in the control substrate (EC = 1.7 dS/m) and substrate with EC = 6.8 dS/m. The quality of fruit is observed by a difference in the maturing of the first fruit of the first and second branches of tomatoes, and through the concentration of sugar and acid in the fruit, depending on the position of the plants. The obtained results show that salinity induces higher sugar content and total acidity in grafted and non-grafted tomato fruits. Also salinity leads to faster ripening of grafted and non-grafted tomato. tomato; salinity; grafted; nongrafte

Effects of Salinity on Color Changes, Sugar and Acid Concentration in Tomato Fruit

Tomato (Lycopersicon esculentum, Mill) is vegetable which is relatively resistant to salt concentration in growing substrate. However, research has shown that salinity stress causes changes in the quality of the fruit, which indirectly affects the yield. So the aim of this research was to determine the change in color of ripening fruits, the amount of sugar and acid in the fruit as indicators of the quality of the fruit. Tests were conducted in a greenhouse on tomato cv. Buran F1, where were two varieties of seedlings, grafted and non grafted, grown in the control substrate (EC = 1.7 dS/m) and substrate with EC = 6.8 dS/m. The quality of fruit is observed by a difference in the maturing of the first fruit of the first and second branches of tomatoes, and through the concentration of sugar and acid in the fruit, depending on the position of the plants. The obtained results show that salinity induces higher sugar content and total acidity in grafted and non-grafted tomato fruits. Also salinity leads to faster ripening of grafted and non-grafted tomato. tomato; salinity; grafted; nongrafte

Morphological characteristics and antioxidant properties of Allium ursinum L. wild growing in the northwestern part of the Republic of Srpska (Bosnia and Herzegovina)

Allium ursinum L. (ramson) has been used for centuries as a food and medicinal herb. Generally, the phenology, morphology, as well as health benefits of Allium ursinum plants have been scientifically validated; however, the knowledge about geographic variation in morphological characteristics and antioxidant properties of Allium ursinum are fairly scarce. The aim of this study, therefore, was to reveal the habitat preferences of Allium ursinum in different geographical regions of the Republic of Srpska (Bosnia and Herzegovina) and to evaluate its morphological characteristics of stems, leaves and bulbs and its antioxidant properties. Morphological characteristics as well as antioxidant properties of Allium ursinum plants including total phenolics and flavonoids contents, and ferric reducing antioxidant power (FRAP) were determined. In this study, the high abundance of Allium ursinum plants was recorded at five different locations: Laktaši, Kozara, Prnjavor, Kneževo and Drinić. The results of this study revealed that Allium ursinum prefers forest habitats and that their morphological characteristics and antioxidant properties are strongly dependent on both geographical location and habitat conditions. We hereby suggest that Allium ursinum can be considered a valuable source of phenolic compounds with relevant antioxidant activity