THE ABILITY OF VARIETIES AND SELECTED FORMS OF SPECIES OF THE GENUS SORBUS TO VEGETATIVE REPRODUCTION IN THE CONDITIONS OF THE SOUTH OF WESTERN SIBERIA
S.V. Asbaganov, A.V. Lokteva, T.A. Nedovesova
Central Siberian Botanical Garden, SB RAS, Novosibirsk, Russia
Keywords: mountain ash, vegetative propagation, IBA, cuttings, ñhip-budding
Abstract
The study of the ability to vegetative propagation by green cuttings in comparison with spring and summer grafting of selected forms and varieties of the genus Sorbus L., from the collection of the CSBS SB RAS, Novosibirsk, was carried out. The objects of the study were selected forms of Siberian mountain ash, common mountain ash, varieties, and interspecific hybrids. The effect of the cuttings type, root-forming stimulators IBA (50 mg/L), Tellurium-M (1 %), quercetin (15 mg/L), and conditions for growing rooted cuttings was studied. In the grafting experiments, the methods of spring grafting and summer ñhip-budding were used. It is established that different forms of Siberian mountain ash exhibit significant variability in their ability to rhizogenesis under different conditions, which may allow us to achieve a higher percentage of rootability by varying these conditions. When rooting Siberian mountain ash with green cuttings from the entire terminal growth of the current year with a plot of last year’s wood treated with IBA, a high percentage of cuttings with callus (50 %) and with roots (27 %) was observed. The rootability of green cuttings of varietal mountain ash depended on the origin of the variety. In the ‘Nevezhinskaya’ mountain ash, cuttings practically do not take root and do not form a callus even when treated with stimulants. Cuttings of the varieties ‘Alaya krupnaya’ and ‘Burka’ take root well without treatment with stimulants. Treatment with stimulators of IBA, Tellurium-M with rearing for the second year in the greenhouse allows you to get a high percentage of rooting and further preservation of cuttings. The efficiency of vegetative reproduction by summer ñhip-budding is on average from 92 to 100 %. During the spring grafting, the survival rate of grafting on average was from 38 (‘Nevezhinskaya’) to 86 % (Sorbus sibirica f. ITPM-1), but the seedlings grafted by spring grafting develop with less intensity compared to the summer ñhip-budding. The effectiveness of summer ñhip-budding decreases depending on the calendar dates of grafting from 100 % on July 15 to 88 % by August 15. Based on the data obtained, in the conditions of Novosibirsk, the best way to propagate mountain ash is summer ñhip-budding.
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