Predicting Field Effectiveness of Endophytic <em>Bacillus subtilis</em> Inoculants for Common Bean Using Morphometric and Biochemical Markers
2024
Oksana Markova | Svetlana Garipova | Aelita Chistoedova | Viktoriia Matyunina | Alsu Lubyanova | Oksana Lastochkina | Arsenii Garipov | Irina Shpirnaya | Lyudmila Pusenkova
According to four field experiments, after the inoculation of <i>Phaseolus vulgaris</i> L. cultivar Ufimskaya with the commercial strain <i>Bacillus subtilis</i> 26D and the promising strain <i>B. subtilis</i> 10–4, it was found that inoculation with <i>B. subtilis</i> 10–4 improved seed productivity (SP) by 31–41% per plant, but only in dry years. In contrast, all 4 years of inoculation with <i>B. subtilis</i> 26D were ineffective or neutral. It was intended to determine the growing and biochemical characteristics of inoculated 7-day-old plants, which correlate with the field SP of bacterial preparations. The SP of inoculated plants (average of 4 years) correlated with root length (0.83), MDA content (−0.98), and catalase (CAT) activity in roots (−0.96) of week-old seedlings. High correlation coefficients between the H<sub>2</sub>O<sub>2</sub> content in the roots and SP (0.89 and 0.77), as well as between the H<sub>2</sub>O<sub>2</sub> content in shoots and SP (0.98 and 0.56), were observed only in two dry years, when the influence of bacteria was detected. These physiological indicators were identified as potential markers for predicting the effectiveness of the endophytic symbiosis between bean plants and <i>B. subtilis</i> strains. The findings may be used to develop effective microbial-based, eco-friendly technologies for bean production.
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