الفهرس | Only 14 pages are availabe for public view |
Abstract Two field experiments were carried out in the private farm at Khatatba, Minufiya Governorate, during the winter seasons of (2016, 2017) and (2017, 2018), to investigate the potentialities of nanobiostimulators contained seaweeds, salicylic acid, proline, CPPU, BR, Si also JA on a number of physiological suspects of tomato plants (Solanum lycopersicum) under low temperature to determine the extent to who is these nanobiostimulators can a meliorate the adverse effects of chilling temperature to achieve the high quantity and quality of yield under chilling stress condition. Nine treatments were maintained i.e untreated plants (Cont.), NB1 with two concentrations (NB1-1:0.5 ml\ L) and (NB1-2:1.0 ml\ L), NB2 with two concentrations (NB2-1:0.5 ml\ L) and (NB2-2: 1.0 ml\ L), JA with two concentrations (JA1:5 ppm) and (JA2: 10 ppm), as well as Si with two concentrations (Si1:2 mM) and (Si2: 3 mM) with three replications for each treatment. Foliar spray was given to tomato seedling grown under low temperature was started at 45 DAT and repeated 3 times each 15 days intervals and samples were taken at 60, 75 and 90 DAT. On the basis of present investigation, it was concluded that low temperature caused significant reduction in plant height, leaves and branches fresh and dry weight, leaf area. Chilling also results in alteration in plant metabolism as well as loss of yield. The present study indicated that foliar sprayed NB2, NB1 and Si caused a number of physiological and biochemical changes in tomato plants, including increased content of chlorophyll, antioxidants enzymes and proline content, sugars, phenols and N, P and K content. |