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The anatomical structure of the tomato (Lycopersicon esculentum Mill.) pericarp was studied in the fruits of five determinant field cultivars. The fruits of the examined cultivars differed in their mechanical properties. Fruits of cultivars which are firm and resistant to injury (Kecskemeti 886j-2, Campbell 28), moderately firm and resistant (Atma, Wenus) and soft, susceptible to injury (line No 155/84) were examined. The pericarp of the cultivars which have fruits resistant to injury had an approx. 200 µm thick covering layer (epidermis plus cuticle plus hypodermis) whereas that of fruits susceptible to injury was only 100 µm thick. In the fruits resistant to injury the cuticle penetrated deeply into the hypodermis, the epidermal cells were flattened and the hypodermis was composed of 4 - 5 rows of cells. The tomato fruits resistant to injury had a thick cuticle layer on their tangential walls — whereas those more susceptible had a thick cuticle layer on these walls.
Tomato is well known regarding its quality and nutritional value in all over the world but imbalances of fertilizer nutrients severely affect the quality of tomato. To investigate the specific contribution of potassium to yield and quality of tomato, a field experiment was conducted on two tomato cultivars, Nagina and Roma. Foliar application with varying levels (0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0%) of potassium solutions was applied to the plants and compared with control (without K). Exogenous application of 0.6% K significantly improved plant height, lycopene content, potassium, fruit weight and diameter. Exogenous application of 0.5, 0.6 and 0.7% K maximally improved ascorbic acid contents of both tomato cultivars whereas 0.4 and 0.8% did not improve ascorbic acid contents. Due to positive correlation between K nutrition and fruit quality attributes, exogenous application of an appropriate K level can contribute to higher yield and better quality of tomato fruits. Among all potassium levels, 0.5–0.7% K maximally improved performance of tomato plants of both cultivars.
In an experiment conducted in 2012-2013, tomatoes were grown in coco coir inoculated with mycorrhizal fungi, in a heated plastic tunnel in the garden of the Research and Experimental Station of the University of Warmia and Mazury in Olsztyn. The experimental materials comprised seedlings of three tomato cultivars, ‘Torero F1’, ‘Growdena F1’ and ‘Listell F1’, supplied by a horticultural farm. The second experimental factor was inoculation of the plant growth medium with endomycorrhizal fungi from the genus Glomus. The aim of this study was to determine the chlorophyll content of leaves of three tomato cultivars grown in coco coir inoculated with mycorrhizal fungi. Each treatment consisted of seven coco coir mats (100 x 20 x 7.5 cm) with four tomato plants grown in each mat, pruned to produce 23 clusters. The experiment was carried out in triplicate. Seedlings, planted in rockwool cubes, were initially placed next to the openings made in the coir mats. Immediately before planting, each seedling was supplied with 10 ml of a standard working solution containing mycorrhizal fungi. The mycorrhizal inoculum was applied directly to the coco coir. Mycorrhizal fungi were not used in the control treatment. The results showed that, in most treatments, SPAD readings recorded in the fall were lower than in the summer, and the noted values were similar to those determined at the beginning of the growing season. The mycorrhizal inoculum improved the nutritional status of tomato plants determined based on the leaf greenness index. The mycorrhizal inoculum increased the yields of all analysed tomato cultivars.
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