معرفي چند دورگه بين گونه اي انگور مقاوم به بيماري باكتريايي سرطان طوقه و ريشه

INTRODUCTION OF SOME RESISTANT INTERSPECIFIC HYBRIDS OF GRAPEVINE TO CROWN GALL DISEASE

To identify and determine susceptibility and resistance of some commercial cultivars of Vitis vinifera and interspecific hybrids of Vitis to crown gall, 3 years experiments were conducted. Twenty commercial cultivars of grapevines and 6 interspecific hybrids were compared against inoculation with Agro bacterium vitis (isolated from grapevine sap and cultured on modified RS media) The nursery soil was contaminated with the bacterial suspension (5x10 cfu ml-1 10 kg-1 nursery soil). After root regeneration, cuttings were inoculated to the bacterium crown gall agent by injection of bacterial suspension (5x108 cfu ml-1) (lml in 2nd internode of green stem). Also, speared with sterile toothpick on to stem. At the end of 3rd year, the percentage of infected plants were recorded. Results showed that all studied European grapevine cultivars were susceptible or very susceptible, but hybrids showed strong or good resistance behavior, specially hybrids 4 and 6.