Background. European plum (Prunus domestica L.) is one of the leading stone fruit crops cultivated in Southern Russia. Therefore, it is very important to study the adaptability of its cultivars comprehensively.Materials and methods. European plum cultivars with different maturation periods developed at Maikop Experiment Station of VIR were studied in 2008–2021 under the conditions of the field gene bank of Maikop Experiment Station. The calendar dates were recorded for the passage of the important phenological phases. Productivity, commercial and consumer fruit qualities, and fruit weight were assessed using conventional techniques.Results. The growing season of the studied plum cultivars started from March 15 (‘Vengerka Maikopskaya’, k-15081) to April 16 (‘Spurochka’, k-43477). The beginning of flowering was recorded from April 9 (‘Vengerka Maikopskaya’) to April 22 (‘Vengerka Tsitvenbyul’, k-43331). The flowering phase duration was 7 to 10 days. The flowering phase started later for cvs. ‘Vengerka Maikopchanka’ (k-43326), ‘Vengerka Sladkaya’ (k-43329), ‘Vengerka Tsitvenbyul’, ‘Vengerka Shuntuchka’ (k-43334) and ‘Lakomka’ (k-43471). Mass fruit ripening was observed from August 5 to September 9. The highest fruit flavor score was recorded for cvs. ‘Arvita 44-4-10’ (k-28409), ‘Vengerka Vkusnaya’ (k-43323), ‘Vengerka Sladkaya’, ‘Vengerka MOS VIR’ (k-15080), ‘Vengerka Shuntukskaya’ (k-15079), ‘Izmamot’ (k-48408) and ‘Chernosliv Adygeiskiy’ (k-23743). Large-fruited cultivars were: ‘Chernosliv Adygeiskiy’, ‘Chernosliv Predgorny’ (k-43488), ‘Arvita 44-4-10’, ‘Vengerka Vkusnaya’, ‘Vengerka MOS VIR’ and ‘Vengerka Maikopskaya’. Higher productivity was observed in cvs. ‘Vengerka Sladkaya’, ‘Chernosliv Adygeiskiy’ and ‘Chernosliv Shuntukskiy’ (k-23707). Cultivars with the most stable productivity were ‘Arvita 44-4-10’, ‘Vengerka Sladkaya’ and ‘Chernosliv Adygeiskiy’.Conclusions. Analyzing the results of a long-term study of plum accessions helped to identify cultivars with the most valuable traits.
Climate warming has turned out to be a significant factor in viticulture and winemaking in all grape-growing areas of the world. Many countries consider the advance of viticulture to the north and to mountainous areas as a possible way to adapt to warming. The factors limiting the zone of viticulture in Russia have been identified by Soviet scientist F.F. Davitaya in 1948, and they are still relevant. They are the sum of active temperatures above 10 °C (ΣT10 > 2500 °C), mean of absolute minimum temperatures (Tmin > –35 °C), length of the frost-free period (Lff < 150 days), and hydrothermal coefficient (0.5 < HTC < 2.5). The values of these limiting factors in the present-day zone of commercial viticulture (ZCV) correspond to the ranges defined by F.F. Davitaya, with the exception of Tmin, which in the modern ZCV in European Russia is above –26 °C everywhere. The objective of this work was to assess the possibility of moving the boundaries of the ZCV to the north under the existing and predicted climate conditions in European Russia. The 1980–2019 daily data from 150 weather stations of the Federal Service for Hydrometeorology and Environmental Monitoring were used to calculate mean long-term values, trends and forecasts for 2050 for the ZCV limiting factors and locate the points lying in the range acceptable for viticulture. The QGIS program was applied to plot the points on the European Russia map and mark the terminal latitude. Versions with Tmin > –26 °C and Tmin > –35 °C were considered. On average for European Russia, in 1980–2019, there was an increase in ΣT10, Tmin, and Lff and a decrease in HTC. However, in the same period, Tmin showed a tendency toward decreasing at a number of points at latitudes lower than 55° N. The increase in heat supply during the growing season in European Russia implies a possibility of expanding the ZCV northward, beyond the present-day terminal latitude of 46.6° N, to 51.8° N under the existing conditions, and up to 60.7° N by 2050. In addition, even under the current conditions viticulture is possible in the area of Kaliningrad (54° N, 20° E). Using extra protective measures in winters not colder than –35 °C would make it possible to grow grapes at up to 53.3° N under the current conditions and at up to 60.7° N under the prognosticated ones. At the same time, a possible decrease in the minimum winter temperature at the south of European Russia will require additional protective measures in winter, while an increase in the aridity of the climate on the northwest coast of the Caspian Sea will reduce the area under non-irrigated vineyards.
Cucurbits are among the most valuable vegetable crops widely used for food all over the world, being an important source of carotenoids and carotenes, biologically active substances with antioxidant and other types of activity. Their content largely depends on the Cucurbita species and varietal features. The Cucurbita collection of the N.I. Vavilov All-Russian Institute of Plant Genetic Resources (VIR) contains more than 3,000 accessions of five cultivated Cucurbita spp. and serves as the most important source of source material for developing new cultivars in order to expand the range of functional food products. The present research was aimed at studying the content of carotenoids and carotenes in the fruits of Cucurbita maxima Duch., C. pepo L. And C. moschata Duch. ex Poir. grown in Northwestern Russia, which is characterized by a short growing season and a low sum of active temperatures. The performed study revealed significant differences between the Cucurbita species and cultivars in terms of the content of carotenoids, total carotenes and β-carotene. In contrast to C. pepo, the accessions of C. maxima and C. Moschata were characterized by a wide range of variation of these characters. A statistically significant effect of the flesh and fruit skin color on the content of carotenoids, carotenes and β-carotene in them was observed (p < 0.001). The minimum amount of carotenoids, carotenes and β-carotene was found in the fruits with light yellow flesh, and the maximum in those with dark orange flesh. Cucurbit fruits with red skin accumulated more target compounds in contrast to the fruits with white skin. The identified Cucurbita accessions with high content of carotenes and carotenoids can be used as valuable source material for breeding cultivars with improved biochemical composition, which can broaden the range of functional food products when grown in the regions with unfavorable conditions for the production of this crop.
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