Impact of Plant Growth-Promoting Rhizobacteria Inoculation on the Physiological Response and Productivity Traits of Field-Grown Tomatoes in Hungary

Drought-tolerant plant growth-promoting rhizobacteria (PGPR) may promote development under limited water supply conditions, when plant’s demand is not completely satisfied rain-fed conditions or irrigation availability limited. The aim of this study was to examine the effects two inoculation treatments (B2: Alcaligenes sp. 3573, Bacillus BAR16, and PAR11 strains B3: Pseudomonas MUS04, Rhodococcus BAR03, Variovorax BAR04 strains) compare those a control (B0) without artificial on chlorophyll fluorescence, leaf content (SPAD value), canopy temperature, yield processing tomato cultivar H-1015 F1 grown field conditions. young seedlings hybrid variety were immersed in 1% B2 B3 products (BAY-BIO, Szeged Hungary) for 5 min. Inoculated untreated three [regular (RI), deficit (DI), no (I0)], reveal effect PGPR different levels stress. In dry year (2018), higher temperature fluorescence (Fv/Fm) measured during flowering plants treated with bacteria than plants. stage fruit setting, treatment led significant decrease Fv/Fm value, remained high, SPAD value statistically same all treatments. Under supply, most cases, significantly greater total but more unripe green berries compared moderate shortage (dry + irrigation), resulted 26% ripe, marketable 49% less treatment. On other hand, wet (2020), bacterial generally did affect physiological properties, though produced while amount diseased fruits differ statistically, irrigation. Based our study, we recommend application product as it positively affected key processes, leading particularly shortage.