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The research has been conducted in greenhouses where grafted and ungrafted tomatoes have been produced. A Romanian tomato variety and a Romanian tomato hybrid, 'Buzău 1600' and 'Siriana' F1, were used as scions and two of the Lycopersicon genus, 'Emperador' F1, 'Groundforce' F1 were used as rootstocks. They were obtained four grafted combinations. For all grafted combinations, the grafting percentage was ranging from 95% to 98%. Both rootstocks utilized have influenced the vigor of the grafted plants. Comparative to the ungrafted plants, the rootstock also influenced the productivity of plants. The highest fructification potential has been observed at 'Siriana' grafted on both rootstocks. Compared to ungrafted tomatoes, which has yielded 2.15 kg per plant, the highest yield obtained from 'Siriana' grafted on 'Emperador' has been of 3.25 kg per plant, followed by 'Groundforce' rootstock with 3.2 kg per plant. 'Buzău 1600' have been produced 3.21 kg per plant when grafted on the 'Emperador' rootstock and 3.15 kg per plant when grafted on the 'Groundforce' rootstock. The largest production augmentation (54.76%) was noted at 'Siriana' tomato grafted on the 'Emperador' rootstock. The 'Buzău 1600' tomato grafted on the 'Emperador' rootstock have registered a 49.3% increment in production. These rootstocks have slightly influenced the content of the soluble dry substance to both grafted tomatoes. The grafting has had an insignificant influence of the total amount of carbohydrates at all grafting combinations.

The tomatoes have highest share in Romanian crops from protected spaces (greenhouses, solariums). The grafting is an agronomical technique that induces or improves some qualities of the tomato cultivars (resistance to soil diseases and pests, resistance to abiotic factors, quantity and quality of fruit production). The research was aimed the establishing of the technological stages for producing of scion and rootstock seedlings from L. esculentum species, to obtain compatible phenotype when is grafted. The observations of this research were conducted on Department of Horticultural Cultures in Protected Spaces from Horting Institute Bucharest. The experience was carry out on a cultivar collection consisting from L. esculentum plants: scions (‘Siriana’–F1 hybrid and ‘Buzău 1600’– variety), creations from the germplasm bank of Research and Development Station for Vegetable Growing Buzău Romania (VDRS Buzău) and rootstock (‘Groundforce’–F1 hybrid). The plant diameters were correlated for a grafting by the annexation method, cutting at 45 degrees. The grafting was performed successfully. The technological steps have achieved phenotypic compatibility of the symbiotes when was the grafting by annexation. The technology for producing of scion and rootstock seedlings at these Romanian tomatoes (‘Siriana’ and ‘Buzău’ 1600) was established for the crops in protected spaces in south area of Romania.

This study aimed to identification of some rootstocks for cucurbitaceous vegetables and their influence on cultures. These vegetables (cucumber, watermelon, melon) are very popular crops in Romania. Vegetable crops are very sensitive to climatic vagaries, so fluctuation in climatic parameters at any phase of growth can affect the yield. Grafting on Cucurbitaceae is a method which has improved and spread quickly during the past years, a similar approach to crop rotation, a practice meant to increase productivity, resistance or tolerance to soil diseases and pests, as well as to abiotic factors and at increasing fruit quality. The research was conducted at the Horting Institute, Bucharest, Romania. Several aspects are taken into account in the use of rootstocks: environmental adaptability, quality fruit, resistance/tolerance for soil diseases and pests, drought, floods, soil salinization, heavy metal content, organic pollutants. Some resistant rootstocks have been identified worldwide (PS1313, RS841, bottle-gourd, NUN-9075, Argentario, PI296341 and others). Several rootstocks are very used in Romania for conventional and ecological crops (UG 29A, Shintoza, Emphasis, Cobalt and others). Following the studies undertaken on research trials in the greenhouses, many rootstock genotypes were selected and tested in the Horting Institute and some results are presented in this paper.