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Effects of Endophytic Bacillus Subtilis and Salicylic Acid on Postharvest Diseases (Phytophthora infestans, Fusarium oxysporum) Development in Stored Potato Tubers

1
Ufa Federal Research Centre of the Russian Academy of Sciences, Bashkir Research Institute of Agriculture, Ufa 450059, Russia
2
Institute of Biochemistry and Genetics, Ufa Federal Research Centre of the Russian Academy of Sciences, Ufa 450054, Russia
3
Department of Biology, Bashkir State University, Ufa 450074, Russia
4
Department of Nutrition and Dietetics, Health Science Faculty, Afyonkarahisar Health Science University, 2078 Afyon, Turkey
*
Author to whom correspondence should be addressed.
Plants 2020, 9(1), 76; https://doi.org/10.3390/plants9010076
Received: 14 December 2019 / Revised: 31 December 2019 / Accepted: 31 December 2019 / Published: 7 January 2020
Postharvest diseases of potato lead to significant food and economic losses worldwide. The exogenous application of eco-friendly methods plays an important role in the control of postharvest decay. In this work the effects of endophytic bacteria B. subtilis (10-4, 26D) were studied in the context of two application parameters: concentration, with a range between 103–108 CFU/mL tested, and synergistic effects of the signal molecule salicylic acid (SA) (0.05 mM) on potato tubers’ resistance to Phytophthora infestans and Fusarium oxysporum during storage. The experiments were carried out on hydroponically grown potato (Solanum tuberosum L.) mini-tubers. This study demonstrates the suppressive effect of B. subtilis (10-4, 26D) on diseases of potato during storage and reveals that this effect happens in a dose-dependent manner, both individually and in combination with SA. The most effective concentrations of B. subtilis for suppression of both Ph. infestans and F. oxysporum are 108 CFU/mL (10-4 and 26D), 107 CFU/mL (10-4 + SA) and 106 CFU/mL (26D + SA). The ability of B. subtilis (10-4, 26D) to effectively penetrate and colonize the internal tubers’ tissues when applied immediately prior to storage, and the ability of SA to accelerate these processes, have been proven. B. subtilis (10-4, 26D), individually and in compositions with SA, increased ascorbic acid content and decreased pathogen-induced proline accumulation and lipid peroxidation in tubers. This indicates a protective effect conferred to cells against reactive oxygen and an extension of aging processes, manifested by a prolonged shelf life and extended preservation of fresh appearance. View Full-Text
Keywords: endophytic Bacillus subtilis; salicylic acid; postharvest diseases; Phytophthora infestans; Fusarium oxysporum; resistance; potatoes endophytic Bacillus subtilis; salicylic acid; postharvest diseases; Phytophthora infestans; Fusarium oxysporum; resistance; potatoes
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Lastochkina, O.; Baymiev, A.; Shayahmetova, A.; Garshina, D.; Koryakov, I.; Shpirnaya, I.; Pusenkova, L.; Mardanshin, I.; Kasnak, C.; Palamutoglu, R. Effects of Endophytic Bacillus Subtilis and Salicylic Acid on Postharvest Diseases (Phytophthora infestans, Fusarium oxysporum) Development in Stored Potato Tubers. Plants 2020, 9, 76.

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