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Abstract
Shoot tips from in vitro-established shoot tip cultures of Prunus avium L. cv. Hedelfingen and cv. Starkrimson were cultured on sweet cherry propagation medium to which several concentrations of paclobutrazol (PP333) were added and gibberellic acid (GA3) omitted, in order to reduce the elongation of the shoots. A reduction in both shoot length and bud number was achieved even with the lowest concentration of paclobutrazol (0.2 mg·liter–1). Shoot tips from the inhibited cultures when replanted on regular propagation medium overcame the inhibition at the first transfer. In order to use this system for cold preservation experiments, the cultures were examined under dark and low temperature conditions (0.5° ± 0.5°C). There was a significant difference between the PP333 system and the control after certain periods of cold preservation. The survival ratio of the PP333-inhibited culture was higher than the control after removing from the cold preservation conditions and recultured. Chemical name used: β-[(4- chlorophenyl)methyl]-α-(1,1-dimethylethyl)-1H-1,2,4-triazole-1-ethanol.
Abstract
Propagation of apricot (Prunus armeniaca L.) has been achieved using several media for establishment, shoot development, and rooting. Most of the rooted plants were established successfully outdoors.
Abstract
Four cultivars of sweet cherry (Prunus avium L.) were propagated in vitro. The best basal medium for bud establishment was Knop’s solution and for bud proliferation was Murashige-Skoog’s medium. 6-Benzylamino purine (BA) at 1 mg/liter and indolebutyric acid (IBA) at 1 mg/liter were optimal for both bud establishment and bud proliferation. Increased rooting efficiency was obtained with basal shoot wounding and treatment with 0.5 mg/liter naphthalenacetic acid (NAA). Plantlets transferred to soil developed normally.
Abstract
In the paper “In Vitro Propagation of Sweet Cherry Cultivars” by Iona Snir [HortScience 17(2): 192-193. 1982] corrections have been made to the experimental method. Page 193, line 8, should read “irradiance intensity of 40 μEm-2s-1” instead of “600 μW/cm2.”
Abstract
Several chemicals, used to induce budbreak of deciduous fruit trees in areas lacking sufficient chilling units were applied to 3 cultivars of red raspberry (Rubus idaeus L. cvs. Delmes, Mailing Exploit, and Schoenemann) grown in Bet Dagan, Israel. All treatments including oil + dinitrol-o-cresol (5%), KNO3 (5%), thiourea (1%), and cyanamide (4%) solutions improved budbreak, and increased yield. The most impressive effect was obtained with 4% cyanamide, which increased fruit size, earliness, and yield.
Abstract
Rapid propagation of the apple rootstocks Mailing Merton (MM) 104, MM 106 and MM 109 (Malus sp.) achieved was by shoot tip proliferation using a Murashige and Skoog basal medium with 1 mg/liter 6-benzylamino purine (BA) and 1 mg/liter indolebutyric acid (IBA). Improved proliferation was achieved by using a liquid medium. Two media were selected for rooting: the first contained IBA for root initiation and the second was without IBA but plus 0.25% activated charcoal for improved root development. Plantiets were successfully transferred to soil.