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¹ Antalya Tarım A.Ş, Antalya
² Çukurova Üniversitesi, Ziraat Fakültesi, Bahçe Bitkileri Bölümü, Adana Viewed : 1673 - Downloaded : 1594 In the seedless watermelon breeding programme, firstly, tetraploid parents must be developed by the breeders. When diploid watermelon lines treated with colchicine and oryzaline in vivo and vitro conditions, tetraploid plants could be obtained. The diploid and tetraploid watermelon plants should be selected within the population. For this reason, some markers (morphological, isozyme, cytological and molecular techniques) are needed to separate from diploid and tetraploid plants. Chromosome counts and DNA content of diploid and tetraploid plants as a result of measurement of flow cytometry distinction can be made definitively. However, the laboratory infrastructure required to implement each method, is not economical. The purpose of this study is to select the tetraploid watermelon plants at M1 stage from populations applied colchicine and oryzaline with morphological anda cytological investigations in in vivo conditions. In this study, tetraploid plants belong to the four watermelon lines and diploid plants compared with the morphological and cytological dates. Morphological dates; width of the leaf-length (cm), male flower diameter (mm), diameter-length of the ovary (mm), the female flower petal width and length (mm) were measured. Cytological assessment of the stoma diameter (μm), stomatal length (μm), stomatal density and chloroplast number were measured. In the present study has shown that the tetraploid plants grow vigorously as compared to diploid plants. Tetraploid plants are the number of chloroplasts increased, but decreased stomatal density were determined. As a result, tetraploid plants could be selected practically and economically by using morphological and cytological data for watermelon plants. Keywords : Watermelon, Tetraploid, Diploid, Cytological, Morphological