Hossein Afshari; Raheleh Zahedi; Tahereh Parvaneh; Masoud Zadehbagheri
Abstract
In order to study the effect of different concentrations of salicylic acid in two commercial apricotcultivars of Shahrood namely ‘Shahrood 41’ and ‘Jaffari’, under cold stress, a factorial experiment wasconducted in a randomized complete block design with three replications in ...
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In order to study the effect of different concentrations of salicylic acid in two commercial apricotcultivars of Shahrood namely ‘Shahrood 41’ and ‘Jaffari’, under cold stress, a factorial experiment wasconducted in a randomized complete block design with three replications in 2012 at the AgriculturalResearch Center of Shahrood city. The test had four factors including: SA with three levels (0.625, 0.125,0.25mM), three stages of phenological growth (dormancy, swelling and flowering) and four temperature(four, zero, -2 and -4 degree centigrade) and two apricot cultivars (‘Shahrood 41’ and ‘Jaffari’) andmeasured traits were proline and soluble sugars. ‘Jaffari’ cultivar had the highest amount of solublesugars at -4 degree centigrade in bud swelling stage and the maximum rate of proline belonged to0.25mM of SA in the same cultivar, -4 degree centigrade and bud swelling stage. Ion leakage at differenttemperatures and different phonological growth stages were significantly different at five percent level.‘Jaffari’ with lower ion leakage at -4 degree and higher proline content than ‘Shahrood 41’ had higherresistance to frost.
Mehdi Rezaei
Abstract
In this research, chilling and heating requirements of six local cultivars of apricot (Jafari, Ghavami, Jahangiri, Khiari, Khiveaee and Rajabali) were evaluated under field and lab conditions. Under lab condition, ‘Rajabali’ and in some extent ‘Johangiri’ began flowering after ...
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In this research, chilling and heating requirements of six local cultivars of apricot (Jafari, Ghavami, Jahangiri, Khiari, Khiveaee and Rajabali) were evaluated under field and lab conditions. Under lab condition, ‘Rajabali’ and in some extent ‘Johangiri’ began flowering after 500 hours in 4°C. Other cultivars except ‘Khiari’ flowered at 750 h. ‘Khiari’ flowered at 1000 h. In field, due to little difference of flowering time among cultivars, there was a low difference in chilling requirement among cultivars in all models. Calculation of chilling requirements based on chilling hours was around 1400 h while based on Utah, North Carolina and Low chilling models was 1000, 740 and 770 unit, respectively. Chilling requirement in all cultivars was 71 portions based on dynamic model calculation. Amount of heating requirement ranged from 1829 growth degree hours (GDH) in ‘Khivea’ to 3387 GDH in ‘Jafari’. Although little differences exist in flowering onset of cultivars, the differentiation of flowering period among cultivars was around one week. Cultivars showed little differences in flowering onset in locations they meet their chilling requirement.