عنوان مقاله [English]
نویسندگان [English]چکیده [English]
This research was carried out to investigate the cold-hardiness of grapevine buds in a factorial experiment base on completely randomized design (CRD) with 80 treatments and three replications. Treatments included four cultivars (Rish-Baba, Siyah-e-Shiraz, Askari and Bavanati), four sampling dates (6th Dec, 5th Jan, 4th Feb and 6th Mar 2009 and 2010) and low temperature levels (+5, -7, -15, -22 and -30°C). Results indicated that with the decrease of temperature, incidence of bud necrosis increased. Dormant buds of Siyah-e-Shiraz and Askari were most injured by low temperature, whereas, the rate of injury was lower in cvs Rish-Baba and Bavanati cultivars. The lowest and highest LT50 were observed on 6th December in Siyah-e-Shiraz (-14.4°C) and Bavanati (-16.2°C) and Rish-Baba on 6th March in Siyah-e-Shiraz (-10.1°C) and Rish-Baba (-12.8°C), respectively. In general, Rish-Baba and Bavanati were the most tolerant and Siyah-e-Shiraz and Askari were the most susceptible grape cultivars.