Exogenous application of nitric oxide and spermidine reduces the negative effects of salt stress on tomato

Horticulture, Environment, and Biotechnology - Tập 58 - Trang 537-547 - 2017
Manzer H. Siddiqui1, Saud A. Alamri1, Mutahhar Y. Al-Khaishany1, Mohammed A. Al-Qutami1, Hayssam M. Ali1, Hala AL-Rabiah1, Hazem M. Kalaji2
1Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia
2Department of Plant Physiology, Faculty of Agriculture and Biology, Warsaw University of Life Sciences (WULS-SGGW), Warsaw, Poland

Tóm tắt

Due to increasing soil salinity, the world agricultural output is being threatened by the shrinking area of fertile land. In the present study, we explored the interactive roles of nitric oxide (NO; 100 μM) and spermidine (SP; 200 μM) in ameliorating the effects of salt stress (NaCl; 100 mM) in tomato (Solanum lycopersicum L. var. Five Star) seedlings. NaCl stress reduced shoot and root length, shoot and root fresh weight, shoot and root dry weight plant -1 and leaf area leaf -1. NaCl stress also suppressed the biosynthesis of photosynthetic pigments (Chlorophyll a and b) and increased proline (Pro) content, membrane damage and lipid peroxidation by inducing reactive oxygen species (H2O2 and O2• - ) generation in roots and leaves, as well as electrolyte leakage (EL) and malondialdehyde (MDA) accumulation in leaves. However, applying NO and/or SP increased the activities of catalase, peroxidase, superoxide dismutase, glutathione reductase and ascorbate peroxidase and increased photosynthetic pigment (chlorophyll a and b) and Pro accumulation, as well as reducing H2O2 and O2• - and MDA content and EL, under salt stress. When tomato plants were treated with NO and SP simultaneously, NO signaling was further enhanced, which was confirmed by the addition of cPTIO [2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide; NO scavenger].

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