Ecogeographic assessment of mung bean (Vigna radiata (L.) R. Wilczek) from the collection of the Vavilov Institute (VIR)

Background. Mung bean (Vigna radiata (L.) R. Wilczek) is a nontraditional crop for Russia. The crop’s main areas of cultivation are situated in the subtropical zone of the planet. However, positive experience with mung bean cultivation in a number of regions – the South of the European part and the Far East of Russia – implies the expediency of a search for source materials suitable for the development of cultivars adapted to these conditions.

Materials and methods. The results of the field phenotyping of 76 mung bean landraces from VIR have been analyzed. The experiments were performed in 1949–1956 in Uzbekistan (former Central Asian Branch of VIR), and in 2009, 2018 and 2019 in Astrakhan Province, where VIR’s collection had been reproduced from the early 1990s. The data on the variability of phenological and agronomic characters and their relationships were compared for both areas and analyzed using the methods of multidimensional statistics.

Results and discussion. A strong variability of all studied characters and their dependence on the environment were observed in both locations. According to the averaged longterm data, differences were found in the duration of interphase periods and the entire growing season, seed yield, plant height, and 1000 seed weight in both sites. Significant differences were shown in the strength of correlations between the studied characters. In Astrakhan Province and in the years with less favorable conditions in Uzbekistan, the level of correlations between most traits was higher. Therefore, an increase in the strength of the relationships between crop characters may be regarded as an indicator of unfavorable growing conditions. The genotypes with short periods from sprouting to flowering and from sprouting to maturation were the most resistant to environmental changes. It is these traits that should first of all be transferred to mung bean cultivars when promoting its production to the north, beyond its traditional area.

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