Impact of Combined Heat and Salt Stresses on Tomato Plants-Insights into Nutrient Uptake and Redox Homeostasis

• Type: Article in International Scientific Journal
• Date: 2022

Authors

Sousa, B (Author) Other; Rodrigues, F (Author) Other; Soares, C (Author) FCUP; Martins, M (Author) Other; Manuel Azenha (Author) FCUP; Lino Neto, T (Author) Other; Santos, C (Author) FCUP; Cunha, A (Author) Other; Fernanda Fidalgo (Author) FCUP

Journal

Title: Antioxidants

Vol. 33

Final page: 478

ISSN: 2076-3921

Publisher: MDPI

Indexing

ISI Web of Knowledge - 12 Citations

Scopus - 13 Citations

Other information

Authenticus ID: P-00W-6E2

DOI: 10.3390/antiox11030478

Abstract (EN): Currently, salinity and heat are two critical threats to crop production and food security which are being aggravated by the global climatic instability. In this scenario, it is imperative to understand plant responses to simultaneous exposure to different stressors and the cross-talk between underlying functional mechanisms. Thus, in this study, the physiological and biochemical responses of tomato plants (Solanum lycopersicum L.) to the combination of salinity (100 mM NaCl) and heat (42 degrees C; 4 h/day) stress were evaluated. After 21 days of co-exposure, the accumulation of Na+ in plant tissues was superior when salt-treated plants were also exposed to high temperatures compared to the individual saline treatment, leading to the depletion of other nutrients and a harsher negative effect on plant growth. Despite that, neither oxidative damage nor a major accumulation of reactive oxygen species took place under stress conditions, mostly due to the accumulation of antioxidant (AOX) metabolites alongside the activation of several AOX enzymes. Nonetheless, the plausible allocation of resources towards the defense pathways related to oxidative and osmotic stress, along with severe Na toxicity, heavily compromised the ability of plants to grow properly when the combination of salinity and heat was imposed.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 21