3/16/2024 0 Comments Forum elenium metin2![]() In particular, water scarcity is a very important factor for the yield of vegetable crops. Climate change further reduces the water availability, efficiency, and causes drought stress in major agro-systems of the world, especially in rain-fed ecosystems ( FAO, 2020). In order to solve the problem of drought, especially due to water scarcity and lack of precipitation, and to bring agriculture into these regions, either irrigation activities are developed or the application of dry farming methods is attempted ( Oweis et al., 1999 Ekinci et al., 2015). ![]() In such regions, factors such as lack of precipitation, irregularity of precipitation regimes, and scarcity of resources are among the main problems of agriculture. Arid and semi-arid regions in the world are estimated to comprise 16% of the total land, which corresponds to around 21-22 million km 2. Drought causes significant social, environmental, and economic damage. In conclusion, 4 L ha -1 biostimulant amendment might be a promising approach to mitigate the adverse effects of drought stress on tomato.Īmong the natural disasters with meteorological character, the one with the most comprehensive effect is drought. Amendment of biostimulant into the soil also enhanced organic matter and the total N, P, Ca, and Cu content of the experiment soil. Biostimulant applications restored the plant growth, and the most effective dose was 4 L ha -1 under drought condition. In addition, 21%, 16%, 21%, and 17% reductions occurred in LRWC, chlorophyll a, chlorophyll b, and total chlorophyll contents with drought compared to the control, respectively. Water deficit conditions (50% of field capacity) caused decrease in indole acetic acid (IAA), gibberellic acid (GA), salicylic acid (SA), cytokine, zeatin, and jasmonic acid content of tomato seedlings by ratios of 83%, 93%, 82%, 89%, 50%, and 57%, respectively, and shoot fresh weight, root fresh weight, shoot dry weight, root dry weight, plant height, stem diameter, and leaf area decreased by 43%, 19%, 39%, 29%, 20%, 18%, and 50%, respectively, compared to the control (B0D0). The results of the study show that drought stress negatively influenced the growth and physiological characteristics of tomato seedlings while biostimulant applications ameliorated these parameters. This study was carried out under controlled greenhouse conditions with two irrigation levels (D0: 100% of field capacity and D1: 50% of field capacity) and three biostimulant doses (B0: 0, B1: 4 L ha -1, and B2: 6 L ha -1). This research was conducted to investigate the possible effects of biostimulants containing plant growth-promoting rhizobacteria (PGPR) on plant growth parameters, chlorophyll content, membrane permeability (MP), leaf relative water content (LRWC), hydrogen peroxide (H 2O 2), proline, malondialdehyde (MDA), hormone content, and antioxidant enzymes (catalase (CAT), peroxidase (POD), and superoxide dismutase (SOD)) activity of tomato ( Solanum lycopersicum L.) seedlings under different irrigation levels. 4Atatürk University Plant Production Application and Research Center, Erzurum, Türkiyeĭrought adversely affects many physiological and biochemical events of crops.2Department of Horticulture, Faculty of Agriculture, Atatürk University, Erzurum, Türkiye.1Department of Agricultural Trade and Management, Faculty of Economy and Administrative Sciences, Yeditepe University, Istanbul, Türkiye.Metin Turan 1 Melek Ekinci 2 Sanem Argin 1 Mihail Brinza 3 Ertan Yildirim 2,4*
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