در توتونهاي تيپ بارلي PERONOSPORA و سفيدك كركي MELOIDOGYNE INCOGNITA بررسي اثرات ژني مقاومت به نماتد مولد غده

Genetics of resistance of burley tobaccos to meloidogyne incognita and peronospora tabacina A.

Seven tobacco cultivars of Burley type (Burley 21, Burley CDL 28, l3urley Banker. Burley Resistance, Burley 14, Burley 26 and Burley TN 86) were intercrossed in the year 2001) in a half-diallel design and Fls plus parents were transplanted in the year 2001 in Tobacco Research Center in Rasht, with 3 replications and their resistance to Perorlo.spora tabacina A. and meloidogyne incognita were investigated by CORESTA standard methods The diallel analysis of results showed sufficient fitness with additive - dominance model introducing by Hayman and Gritting. Since in formation of resistance of cultivars to nematodes the overdominance effect of genes were seen, in genetic control of hire mould resistance were partial dominance effect of genes involved. the diallel analysis of results showed significant GCA and SCA additive and nonaddictive - dominance-effects of genes) by genetic control of resistance to nematodes, but for resistance of cultivars to blue mould were only (i(`A (additive effects of genes) significant. The estimated narrow sense heritability ( 18-29ʹ1.) for resistance to nematodes and 46-52% for resistance to blue mould give a moderate chance for selecting of resistance lines to nematodes and a good chance for selecting reresistance lines to blue mould. The cultivars Burley Banket and Burley TN 86 were favorite parents for transfering of resistance to nematodes to their progenies. The cultivar Burley CDL, 28 were also with his lowest infection to blue mould and significant and negative GCA the favorable parent for transfering blue mould resistance to their progenies. As progenies with a negative and significant SCA for resistance to nematodes are hybrids (B 21 * B.CDL 28), (B. CDL 28 * B. 26) and (B, CDL 28 * B.TN 28( favorietes. Also the cross progenies of Burley CDI.- 28 with other cultivars showed lowest infection to blue mould.