The protective roles of cycteine in enhancing basil (Ocimum basilicum L.) tolerance to arsenic and chromium toxicity by regulating growth, mineral uptake, photosynthetic activity and antioxidative system
Küçük Resim Yok
Tarih
2025
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Heavy metals such as arsenic (As) and chromium (Cr) are dangerous pollutants that pose a significant threat to the environment and human health. Cysteine (Cys), an antioxidant molecule, has an important role in increasing of plant tolerance to heavy metal stress. This study aimed to evaluate the potential ameliorative effects of exogenous Cys (300 mu M) application on the morpho-physio-biochemical processes of basil (Ocimum basilicum L. cv. midnight) seedlings grown under As and Cr contamination. To attain this objective, seedlings were exposed to different concentrations of As (100 and 300 mu M) and Cr (100 and 300 mu M). The results of this research showed that As and Cr toxicity caused a significant decrease in root, stem and leaf lengths, root, stem and leaf fresh and dry weights, relative water content, PSII photochemistry, chlorophyll a, b, total chlorophyll and total carotenoid contents, stomatal conductance, transpiration and net photosynthesis rates. In contrast, As and Cr exposure increased electrolyte leakage, chlorophyll a/b ratio, intercellular CO2 concentration, lipid peroxidation and hydrogen peroxide content. Exogenous Cys application improved growth parameters by increasing photosynthetic activity, reducing membrane damage and oxidative stress levels. As and Cr stress negatively affected the mineral balance in basil seedlings, whereas Cys treatment helped to maintain homeostasis by regulating mineral distribution. Furthermore, the impact of As and Cr toxicity on enzymatic antioxidants, including catalase, superoxide dismutase, peroxidase, ascorbate peroxidase and glutathione reductase, was found to vary depending on the application dose and enzyme type. It was observed that the most significant effect of Cys was on peroxidase activity. Our findings highlight the potential of Cys to alleviate As and Cr stress in basil seedlings, suggesting a promising approach to enhance plant resistance to heavy metal induced toxicity.s
Açıklama
Anahtar Kelimeler
Antioxidant Defense System, Arsenic, Basil, Chromium, Cysteine
Kaynak
South African Journal of Botany
WoS Q Değeri
Q2
Scopus Q Değeri
Q1
Cilt
187
