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    Effect of Mi gene and nematode resistance on tomato genotypes using molecular and screening assay
    (Allerton Press Inc, 2020) Bozbuğa, Refik; Daşgan, Hayriye Yıldız; Akhoundnejad, Yelderem; İmren, Mustafa; Günay, Özlem C.; Toktay, Halil
    The Mi gene is known to involve in the resistance response to some Root knot nematodes, Meloidogyne spp. in tomato plants Lycopersicon esculentum. Root knot nematodes cause significant damages to almost all crops in the world. Among Meloidogyne species, Meloidogyne incognita is one of the most damages species causing a vast amount of crop loss including tomato plants. The resistance gene may be found in some tomato genotypes or cultivars. Determining the resistance gene, Mi, in tomato cultivars is very important to control root knot nematodes. For this purpose, this study was conducted in 99 tomato genotypes that were screened for resistance against Meloidogyne incognita in molecular and screening assays. Results revealed that Mi gene was only determined in one genotype (Tom113). The result of the screening assay indicated that one of the genotypes (Tom113) showed an immune reaction against the nematode; two genotypes (Tom146, Tom141) were found intermediate; 17 genotypes moderately susceptible, 43 genotypes susceptible and 36 genotypes found highly susceptible. Results of the screening assay confirmed the presence of Mi gene in a tomato genotype, which accompanied with a decreased ability for the nematode in causing the infection. Immune and some promising genotypes are thought as important genetic tools for breeding studies for future works.
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    Identification of common bean (Phaseolus vulgaris) genotypes having resistance against root knot nematode meloidogyne incognita
    (Agricultural Research Communication Centre, 2015) Bozbuğa, Refik; Daşgan, Hayriye Yıldız; Akhoundnejad, Yelderem; İmren, Mustafa; Toktay, Halil
    Root knot nematodes (Meloidogyne spp.) cause immense yield losses in crops throughout the world. Use of resistant germplasms of plants limits the root knot nematode damages. In this study, 87 common bean (Phaseoulus vulgaris L.) genotypes were screened against the root knot nematode, Meloidogyne incognita to determine the resistance response under growth chamber conditions in Turkey. P. vulgaris genotypes were evaluated based on resistance index (RI); root galling severity and nematode egg mass production on a 1-9 scale. The nematode negatively influenced the growth (fresh weight) of bean genotypes. At the completion of the study, 13 bean genotypes were found as immune (Sehirali), highly resistant (TR42164, Seleksiyon 5, Seker Fasulye, Fas-Agadir-Suk-1) and moderately resistant (Acik Badem, TR68587, TR43477, TR53827, TR28018, Gülnar-3, Siyah Fasulye, Kibris Amerikan) against M. incognita thus suggesting the use of such genotypes in breeding studies as a parental material to develop the root knot nematode resistant cultivars. © 2015, Agricultural Research Communication Centre. All Rights Reserved.