اثر محلول‌پاشي سلنيوم بر صفات مورفوفيزيولوژيك و بيوشيميايي گياه آويشن خزنده (Thymus serpyllum L. ) در شرايط كم آبياري

Drought stress is one of the most important abiotic stresses limiting plant growth an‎d production in many regions of the world, including Iran. Therefore, the use of drought-tolerant plants that can maintain acceptable growth under water-deficit conditions is important, particularly in urban green spaces. Creeping thyme (Thymus serpyllum) is a medicinal plant with potential for use as a groundcover plant an‎d may be a suitable alternative to turfgrass in areas facing water scarcity. This study was conducted to investigate the effect of selenium foliar application on the morphophysiological an‎d biochemical characteristics of creeping thyme under deficit irrigation conditions. The experiment was conducted as a factorial experiment in a ran‎domized complete block design with three replications at the Research Greenhouse of the College of Agriculture, Isfahan University of Technology. Drought stress was applied at three levels of 40, 60, an‎d 80% of field capacity, an‎d selenium was foliar-applied at three concentrations (0, 50, an‎d 100 mg L⁻¹). Plants were eva‎luated for morphological, physiological, an‎d biochemical traits, including stem an‎d root dry weight, stem an‎d root length, percentage of cover, recovery an‎d desiccation, crown cover, chlorophyll, carotenoids, chlorophyll fluorescence, electrolyte leakage, relative water content, proline, malondialdehyde, protein, phenol, catalase, an‎d ascorbate peroxidase. Results showed that drought stress significantly affected all eva‎luated traits. Increasing drought stress intensity generally reduced growth an‎d water-status traits an‎d altered physiological an‎d biochemical responses. Selenium foliar application significantly affected some traits, particularly root dry weight, malondialdehyde, an‎d ascorbate peroxidase. The findings indicate that creeping thyme has a useful capacity to tolerate deficit irrigation, while selenium application at the tested concentrations provided a limited but measurable effect on some responses to drought stress.

مهديه غلامي , نعمت اله اعتمادي شلمزاري

رحيم اميري خواه

مهدي رحيم ملك , پرويز احسان زاده