Fruit growing
and viticulture of South Russia

Annotation

The results of inheritance analysis of horizontal resistance to scab of 6508 apple-tree hybrids, 96 combinations are given in 9 crossing groups after artificial infection in an open ground under the conditions of low hills of Altai. A high norm of hybrid seedlings reaction to infection similar to reaction of super-sensitivity of immune forms is revealed. It is established that the part of hybrids, high-resistant and resistant to scab, in the groups with resistant and average-resistant initial forms, as well as in the combinations of susceptible maternal initial form and a cultivar of Mutsu (3x) makes up from 63 to 88%. On the basis of the hybrid-logical analysis it is established that sources of horizontal (polygenic) resistance are the maternal initial forms of Malus baccata 1/1, Malus baccata 23/2 forms, the Altayskiy Golubok, Altayskoe Bagryanoe, Gorno-Altayskoe, Zolotaya Tayga, Nezhnoe Zabaikalyskoe, Pepinka Altayskaya, Ranetka purpurovaya, Ranetka Yermolaeva, Souvenir of Altaya, Tolynay. So-81-907, 18-9, 32-26 and paternal - Aromatnoe, Aport ASS, Belarusskiy Sinap, Bayana, Voskhod, Zharkyn, Naslednitsa Yuga, Pamyat Esauly, Feya, Gala, Golden B, Mutsu (3x), 25-37-45 (4x), McIntosh (4x). Proceeding from the results of field supervision it is established that the hybrids which are selected for breeding garden for further studying after an artificial infectious background keep the high resistance to scab. In the 18th crossing combinations from 27 the degree of affection by a scab under the field conditions is lower on 0,1-1,4 scores, than on an artificial background, in 2 remained at the level of an artificial background, in the 7th extent of affection higher on 0,1-0,7 scores.