Abstract The plantain tree (Platanus orientalis L.) is a crucial part of Iran's urban green landscape, but in recent years it has been affected by premature fall, yellowing, and decay due to climate change and tensions. Decreased rainfall in Iran has limited the water supply for plants, leading to early leaf fall, chlorosis, and tree deterioration. To address these challenges, it is important to utilize genetic diversity and find species adapted to stressful conditions, as well as use organic fertilizer solutions like seaweed extract to strengthen trees. These strategies are essential for increasing tolerance and improving tree growth under stressful conditions. This study aims to explore the genetic diversity between old and young plantain trees in various cities of Iran to identify stress-tolerant ecotypes. It also seeks to examine the impact of drought stress and the age of the mother sources of sycamore propagation on the level of adaptation to environmental stresses. Additionally, the research aims to investigate the endo-therapy effect of trees with yellow leaves and early fall in urban green landscapes. The study was conducted through four separate experiments. The first experiment focused on assessing genetic diversity using SRAP and SCoT primers, as well as morphological diversity between old and young sycamore samples in different cities of Iran. Following this, the potential tolerance and adaptation of seedlings resulting from the propagation of old and young samples of Isfahan City were examined. This experiment involved taking cuttings and eva‎luating the response of the resulting seedlings to drought stress and the application of algae extract Seaweed by measuring physiological indicators. After completing the second experiment and analyzing the results, four samples of old and young plantains were propagated to potentially discover tolerant ecotypes. The third experiment aimed to study the impact of age groups of ecotypes from different regions and the use of various iron sources in response to drought stress at both physiological and molecular levels. Based on the findings from the second and third experiments, which aimed to address leaf yellowing and plantain tree decline in green spaces, the fourth experiment was conducted to explore the effects of endo therapy of plantain trees using iron sources and seaweed extract. The second factorial experiment followed a completely randomized design with three factors: drought stress at three levels (severe drought stress at 50% of the field capacity moisture, mild drought stress at 75% of the field capacity moisture, and a control group at 100% of the field capacity humidity), seaweed extract at three concentrations (0%, 1.5%, and 3%), and old and young age classes of Isfahan ecotype plantains with three replications. The third experiment employed a factorial design, utilizing a completely random design with three factors. These factors included drought stress at three levels: severe drought stress at 50% of the field capacity moisture, mild drought stress at 75% of the field capacity moisture, and a control group with 100% of the field capacity humidity.

علي نيك بخت , نعمت اله اعتمادي شلمزاري

حسين شريعتمداري , اميرحسين جلالي , محمد اعتمادي

مريم حقيقي , مهران شيرواني جوزداني , سعيد ريزي