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Dehbozorgi, Fatemeh, Jafarinia, Mojtaba, Ghotbi Ravandi, Ali Akbar. (1405). The modulatory role of sodium nitroprusside (SNP) in maintaining oxygen-evolving complex functionality in tomato under heat stress. , (), -. doi: 10.22108/ijpb.2026.149910.1463
Fatemeh Dehbozorgi; Mojtaba Jafarinia; Ali Akbar Ghotbi Ravandi. "The modulatory role of sodium nitroprusside (SNP) in maintaining oxygen-evolving complex functionality in tomato under heat stress". , , , 1405, -. doi: 10.22108/ijpb.2026.149910.1463
Dehbozorgi, Fatemeh, Jafarinia, Mojtaba, Ghotbi Ravandi, Ali Akbar. (1405). 'The modulatory role of sodium nitroprusside (SNP) in maintaining oxygen-evolving complex functionality in tomato under heat stress', , (), pp. -. doi: 10.22108/ijpb.2026.149910.1463
Dehbozorgi, Fatemeh, Jafarinia, Mojtaba, Ghotbi Ravandi, Ali Akbar. The modulatory role of sodium nitroprusside (SNP) in maintaining oxygen-evolving complex functionality in tomato under heat stress. , 1405; (): -. doi: 10.22108/ijpb.2026.149910.1463

The modulatory role of sodium nitroprusside (SNP) in maintaining oxygen-evolving complex functionality in tomato under heat stress

علوم زیستی گیاهی
مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 12 مرداد 1405
نوع مقاله: مقاله پژوهشی
شناسه دیجیتال (DOI): 10.22108/ijpb.2026.149910.1463
نویسندگان
Fatemeh Dehbozorgi1؛ Mojtaba Jafarinia* 1؛ Ali Akbar Ghotbi Ravandi2
1Department of Biology, Marv.C., Islamic Azad University, Marvdasht, Iran.
2Department of Plant Sciences and Biotechnology, Faculty of Life Sciences and Biotechnology, Shahid Beheshti University, Tehran, Iran.
چکیده
Heat stress severely impairs photosynthetic capacity and induces oxidative damage in tomato plants, threatening agricultural productivity. This study investigated the protective role of sodium nitroprusside (SNP) against heat stress-induced damage, with a specific focus on oxygen-evolving complex (OEC) functionality. Under controlled environmental conditions, tomato plants were subjected to heat stress at 45 °C, with or without pretreatment with 100 μM SNP. Heat stress drastically reduced net photosynthesis (PN) by 47.07% and significantly decreased the performance index (PIABS) by 88.9%. Furthermore, heat stress increased H₂O₂ levels by 56.23% and reduced the activities of CAT, POD, SOD, and APX by up to 43.7%. However, SNP pretreatment alleviated these adverse effects by limiting the reduction in PN to 20.13% and increasing antioxidant enzyme activities by up to 161.2% compared with heat-stressed plants. Moreover, SNP treatment significantly suppressed the K-band transient, suggesting the preservation of OEC functionality under heat stress. This response, together with improved photosynthetic performance and antioxidant capacity, indicates that SNP treatment contributed to maintaining Photosystem II donor-side activity under heat stress. Overall, SNP treatment effectively alleviated heat stress-induced physiological and photosynthetic damage and may contribute to improved heat tolerance in tomato plants.
کلیدواژه‌ها
Heat stress؛ Photosynthesis؛ Oxidative stress؛ OEC؛ Sodium nitroprusside؛ Tomato
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تعداد مشاهده مقاله: 23


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