Photosystem II of kalanhoe daigremontiana sheltered by bacterial consortium under Mars-like conditions

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“…showed that nonphotochemical dissipation in PSII antenna complexes was reduced. This may indicate indicating improved electron transport downstream from PSII compared to non-inoculated plants and increased demand for ATP [25]. At the same time, qP of stressed plants decreased as compared to control plants kept under ambient conditions.…”

“…Endophytic bacteria, exogenously applied for both plant inoculation, as well as resident ones, possess a potency to alleviate the effect of stressors on PSII [25]. In our project, the photosynthetic efficiency of PSII complexes of Crassulacean Acid Metabolism plant Kalanchoe daigremontiana Hamet & Perr.…”

“…inoculated with endophytic bacteria Methylobacterium sp. IMBG290 was assessed under ambient and stressful conditions (low atmospheric pressure, high CO 2 concentration, and UVB) [25]. The stressful conditions were simulated inside the experimental facility [26] where the specimens of Kalanchoe plants were placed.…”

“…[25,31,34]. Endophytic bacterial communities, known as dynamic systems, are influenced by both internal (genetically determined plant metabolism and associated microbiota) and external (environmental signals) factors.…”

“…In bacteria-treated plants, the quantum yield of nonphotochemical dissipation in PSII complexes is reduced as compared to untreated plants [12,13,25]. This may mean that there is the fraction of QA, the primary electron acceptor of PSII present in the reduced state, indicating improved electron transport downstream from PSII.…”