Distinctive features of the dynamics of photosynthetic pigment contents and the number of cultivated endophytic bacteria forms in Ribes nigrum L. leaves

   The article presents the results of studying the dynamics of photosynthetic pigment contents and the number of cultivated endophytic bacteria (EB) forms in leaves of cultivars of different genetic origin bred by FSBSO ARHCBAN. The research was conducted in 2021-2024 on the blackcurrant (Ribes nigrum L.) collection plantings of the Kokinsky experimental station (Bryansk Oblast) and the research department of the gene pool and bioresources (Stupinsky District, Moscow Oblast) of the FSBSO ARHCBAN. The cultivars included Barmaley, Bryansky Agat, Gamayun, Debryansk, Mif. Weather conditions during the growing season were found to have a signifi cant effect on the content of cultivated EB forms in leaves. On average, over the four-year research period, Bryansky Agat was determined to have the largest number of EB, i. e., up to 107,823 CFU/g. The cultivar was characterized by the most stable abundance indicators of cultivated EB forms in leaves. The blackcurrant cultivars Barmaley and Bryansky Agat were the most responsive to this indicator. The number of cultivated EB forms in their leaves predictably positively correlated with the number of sunny days, as well as with average values of daytime and nighttime temperatures in spring and fall. Except for Mif, all cultivars responded negatively or weakly to the amount of precipitation and daily mean temperature. The Debryansk cultivar was found to be the most unresponsive to weather factors, which may be associated with the lowest annual average number of cultivated EB forms in its leaves (70,713 CFU/g). The high content of cultivated EB forms and chlorophyll a in Bryansky Agat leaves may indicate a possible role of endophytic bacteria in stimulating the synthesis of photosynthetic pigments in blackcurrant leaves.

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