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The Maak cherry (Cerasus maackii Rupr.) has been studied for use as a scion in nursery production. The culture has such economically valuable features as resistance to diseases and pests, winter hardiness, fast regenerative ability, high rooting capacity of green cuttings. The article deals with the peculiarities of cultivation of the Maak cherry by green cuttings in the conditions of the Chelyabinsk region. The objective of the study was to evaluate the Maak cherry for the rooting ability and the possibility of obtaining a standard clonal scion. It has been found that using green shoots of the Maak cherry, 20, 30 and 40 cm long, the rooting capacity of cherry increases by 2.5; 12.5 and 19.1%, respectively, compared to the control variant (15 cm). The yield of standard rootstocks increases, when using longer cuttings 30–40 cm, when compared to the control (15 cm), or 2.5–3.4 times, respectively. Changes also occurred in the increase in the diameter of the conditional root neck, it increased by 9.3; 28.0 and 50.0% more than the control (3.2 mm). It has been proved by the experiment that at cutting length of green cuttings of the Maak cherry with the length of 40 cm, it is possible to get more than 150 pieces of clonal rootstocks suitable for winter grafting from 1m2 of the protected ground during one vegetation period. In green cuttings of the Maak cherry in a greenhouse equipped with a fogging unit, the length of green cuttings planted for rooting has a significant effect on rooting and yield of the uniform clonal rootstocks. When using 30–40 cm long annual shoots cut during the active growth period, rooting ability of the Maak cherry increased 1.3 times, the diameter of the conditional root neck – 1.5 times, the total yield of the suitable for grafting rootstocks – 3.4 times compared to the control variant (15 cm).
The Maak cherry (Cerasus maackii Rupr.) has been studied for use as a scion in nursery production. The culture has such economically valuable features as resistance to diseases and pests, winter hardiness, fast regenerative ability, high rooting capacity of green cuttings. The article deals with the peculiarities of cultivation of the Maak cherry by green cuttings in the conditions of the Chelyabinsk region. The objective of the study was to evaluate the Maak cherry for the rooting ability and the possibility of obtaining a standard clonal scion. It has been found that using green shoots of the Maak cherry, 20, 30 and 40 cm long, the rooting capacity of cherry increases by 2.5; 12.5 and 19.1%, respectively, compared to the control variant (15 cm). The yield of standard rootstocks increases, when using longer cuttings 30–40 cm, when compared to the control (15 cm), or 2.5–3.4 times, respectively. Changes also occurred in the increase in the diameter of the conditional root neck, it increased by 9.3; 28.0 and 50.0% more than the control (3.2 mm). It has been proved by the experiment that at cutting length of green cuttings of the Maak cherry with the length of 40 cm, it is possible to get more than 150 pieces of clonal rootstocks suitable for winter grafting from 1m2 of the protected ground during one vegetation period. In green cuttings of the Maak cherry in a greenhouse equipped with a fogging unit, the length of green cuttings planted for rooting has a significant effect on rooting and yield of the uniform clonal rootstocks. When using 30–40 cm long annual shoots cut during the active growth period, rooting ability of the Maak cherry increased 1.3 times, the diameter of the conditional root neck – 1.5 times, the total yield of the suitable for grafting rootstocks – 3.4 times compared to the control variant (15 cm).
Background. Sweet cherry plants bear fruit annually, are high-yielding, and generate good profits. Cultivars with early-ripening fruits are specially valued. Cultivation of such sweet cherries makes it possible to extend the period of fresh fruit consumption and increase the profitability of orchards. It is therefore relevant to breed new early-ripening cultivars of this fruit plant. Materials and methods. Twenty sweet cherry forms from five hybrid families obtained with in vitro embryo culture techniques at the Nikita Botanical Gardens were analyzed. The original early-ripening cultivars included in the hybridization of ‘Durona di Vignola 2’ and ‘Zemfira’ were used as a control. Flowering dates, fruit ripening dates, fruit weight and quality, resistance to negative temperatures (down to –25.6°C), and susceptibility to fungal diseases were studied from 2012 to 2021 at the Steppe Horticulture Laboratory, Nikita Botanical Gardens, using conventional methods. Results and conclusions. Late-flowering breeding forms 460, 597, 602, 612 and 843 were selected for their lowest susceptibility to the effects of late spring frosts. Forms 343, 366, 453, 459, 460, 602, 612, 653, 353, 387, 600, 653 and 843 had early and very early fruit ripening periods. Forms 320, 434, 460, 593a, 597, 600, 601, 602 and 607 were identified for their high yields. Genotypes 459, 460, 601 and 843 demonstrated resistance to Cylindrosporium hiemale Higg., and 597, 843 and 320 to Monilia cinerea Bonord. High winter hardiness and frost resistance was observed in forms 355, 434, 459, 597 and 602. Breeding forms 460, 602 and 843 were identified as promising for a set of traits (late flowering, large high-quality fruits, resistance to major diseases, and high yield). They are of interest for introduction into horticultural production and use in further breeding work to develop new competitive cultivars.
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