Photosynthetic responses of hydroponically grown basil (Ocimum basilicum L.) to drought and high-EC stress
Małgorzata Mirgos, Piotr Dąbrowski, Hazem Mohamed Kalaji, Jacek Wróbel, Janina Gajc-Wolska, Bogumiła Pawluśkiewicz, Małgorzata Kunka, Katarzyna Kowalczyk
TL;DR
This study explores how drought and high salt levels affect basil's photosynthesis in a hydroponic system, revealing distinct stress responses detectable through chlorophyll fluorescence.
Contribution
The study identifies differential physiological responses to drought and high-EC stress in basil using chlorophyll fluorescence techniques.
Findings
High EC stress caused a wider range of changes in Photosystem II parameters compared to drought stress.
Mature basil plants showed greater tolerance to stress, likely due to more efficient electron transport and structural stability.
Chlorophyll fluorescence measurements effectively detected distinct physiological responses to the two stressors.
Abstract
Basil (Ocimum basilicum L.), a widely cultivated culinary and medicinal herb in the Lamiaceae family, is particularly vulnerable to various environmental stressors. This study examines how water deficit and elevated nutrient-solution electrical conductivity (EC) affect the photosynthetic efficiency of basil plants grown in an nutrient film technique (NFT) hydroponic system. Chlorophyll fluorescence was assessed using both continuous-excitation and modulated pulse-amplitude-modulated (PAM) techniques. Fluorescence parameters were monitored in plants at two developmental stages, immature and mature, under drought and high–electrical-conductivity (EC) stress. Both stressors altered Photosystem II (PSII)—related fluorescence parameters, but high EC stress caused a wider spectrum of changes. In mature plants, those alterations were less pronounced, indicating enhanced tolerance likely due…
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Taxonomy
TopicsPlant Stress Responses and Tolerance · Photosynthetic Processes and Mechanisms · Plant and Biological Electrophysiology Studies