Prof. Dr. Metin Turan

In this study, the ameliorative effect of biochar (B), Trichoderma harzianum (TH) and their combined application (BTH) on plants of Capsicum annuum L. exposed to varying degrees of water deficit was investigated. In control plants exposed to full irrigation (100%) and water restrictions of 75% and 50%, drought stress caused a 20–40% reduction in macro-...

Walnut (Juglans regia L.) is one of the most economically important tree nuts worldwide due to its nutritional and health-promoting properties. The use of plant growth-promoting rhizobacteria (PGPR) in agriculture is increasing attention as a sustainable alternative to intensively used chemical inputs; however, their application to walnut seedlings and their effects on changes in plant...

Increasing rainfall, driven by climate change, threatens vegetable production, especially flooding-sensitive lettuce. This research comparatively evaluated fulvic acid (FA) and humic acid (HA) for mitigating flooding stress (FS) effects on growth, photosynthesis, oxidative stress, antioxidant defense, and mineral nutrition. FS reduced growth by 15–33%, chlorophyll by 37.6–41.7%, and nutrient accumulation by 12.3–64.6%. Both bio-stimulants alleviated...

Drought stress is a major abiotic factor that negatively affects plant growth, physiological processes, and yield in pepper cultivation. This study evaluated the ameliorative effects of exogenous glutathione (GSH) at 50 µM and 100 µM in pepper seedlings grown under water-restricted conditions (60% field capacity), using morphological, physiological, and biochemical parameters. Water restriction significantly reduced...

BackgroundIrrigation extremes, including both water deficit and excessive water supply, can markedly alter plant metabolism. However, the integrated biochemical and hormonal response of aronia (Aronia melanocarpa) to contrasting irrigation regimes remains poorly understood. This study aimed to investigate how different irrigation levels, ranging from severe deficit to surplus irrigation, interact with osmoprotectant applications to regulate...

Highlights What are the main findings? • Humic acid and fulvic acid alleviated waterlogging-induced growth inhibition and improved nutrient acquisition in eggplant. • Humic acid enhanced waterlogging tolerance by reducing oxidative damage and restoring redox homeostasis, whereas fulvic acid promoted growth through reactive oxygen species signaling. • Humic substances improved chlorophyll content, nutrient uptake and...

Salinity is important abiotic stress that limits plant growth and agricultural production. Different approaches can be used to enhance plant growth and alleviate environmental stress. Exogenous application of amino acids could enhance physiological responses to salt stress. We investigated the effects of methionine application on tomato seedling leaves under salt stress at the morphological, physiological,...