Water Stress Alleviation Effects of Biostimulants on Greenhouse-Grown Tomato Fruit

The aim of the present study was to evaluate effects three biostimulant products (Nomoren (N), Twin Antistress (TW), x-Stress (XS) and control treatment (C: no biostimulants added)) on nutritional value, chemical composition bioactive properties greenhouse tomato fruit grown under full (W+: 100% field capacity) deficit irrigation (W–: 70% conditions. Fat content highest for fully irrigated plants that received (CW+), while proteins carbohydrates energetic value were in XSW+ treatment. main detected sugars (fructose, glucose trehalose) varied depending amounts individual total organic acids tocopherols recorded treated with whereas lowest overall values observed XS most abundant fatty palmitic (27.5–36.0%) linoleic acid (27.4–35.4%), followed by oleic (9.2–21.2%), linolenic (5.4–13.1%) stearic (5.3–6.8%). Moreover, β-carotene lycopene CW- NW+ treatments, respectively. TWW+ showed antioxidant activity both assays tested (TBARS OxHLIA). Most extracts lower antibacterial against bacteria compared positive controls. On other hand, CW+, XSW- treatments higher antifungal (MIC values) than In conclusion, each product had a different effect determined characteristics level irrigation. Therefore, more research is needed better identify mechanisms action physiological processes, after which may be used standardize application such cultivation.