Journal
SCIENTIA HORTICULTURAE
Volume 247, Issue -, Pages 421-429Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.scienta.2018.12.047
Keywords
Gas exchange parameters; High temperature; Oxidative damage; Photosynthesis; ROS scavenger; Salicylic acid; Tomato
Categories
Funding
- National Natural Science Foundation of China [31672199, 31801902]
- China Earmarked Fund for Modern Agro-industry Technology Research System [CARS-23-B12]
- Jiangsu Province Scientific and Technological Achievements into Special Fund [BE2017701]
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Heat stress seriously inhibits plant growth and development through damage the photosynthetic components and antioxidant enzymes functions. Salicylic acid (SA) is an important growth hormone regulator for combating heat stress, but its roles in response to high temperature in tomato are largely unknown. The present study was undertaken with a view to investigate the functional along with the potentiality of SA and how to nullify the adverse effects of heat stress (42 degrees C) in tomato seedlings. Our findings revealed that supplementation of 1 mM SA enhanced the gas exchange parameters (Pn, Gs, Ci, Tr, Ls), maximum quantum yield of photosystem II (Fv/Fm), water use efficiency, reduced electrolyte leakage and increased the antioxidant enzymes (SOD, POD, CAT, and APX) activity that helps to reduce oxidative damage through scavenging more reactive oxygen species (ROS) which directly impacts on plants by protecting cell membrane from damage, higher chlorophyll content, lower accumulation of lipid peroxidation, and H2O2. Additionally, exogenous application of SA increased the proline content thus added on osmotic potential which influencing plants for better uptake of water that caused to beneficial effects on stomatal aperture together with photosynthetic apparatus, whereas, high temperature reduced leaf chlorophyll pigment, carotenoid content, leaf water potential, and osmotic potential. Taken together, we concluded that the adverse effects of heat stress could be suppressed by pretreated SA through both in increased photosynthesis activity and antioxidant enzymes functions.
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