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The Scientific World Journal
Volume 2015, Article ID 870520, 9 pages
Research Article

Induced Resistance in Solanum lycopersicum by Algal Elicitor Extracted from Sargassum fusiforme

1Plant Pathology Laboratory, Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa-ku, Nagoya 464-8601, Japan
2Plant Disease and Insect Control Group, Aichi Agricultural Research Center, Yazakosagamine, Nagakute 480-1103, Japan
3Research and Development Group, Ohta Oil Mill Co., Fukuoka-cho, Okazaki 444-0825, Japan

Received 14 October 2014; Accepted 14 January 2015

Academic Editor: Harsh P. Bais

Copyright © 2015 Layth Sbaihat et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Tomato (Solanum lycopersicum) production relies heavily on the use of chemical pesticides, which is undesired by health- and environment-concerned consumers. Environment-friendly methods of controlling tomato diseases include agroecological practices, organic fungicides, and biological control. Plants’ resistance against pathogens is induced by applying agents called elicitors to the plants and would lead to disease prevention or reduced severity. We investigated the ability of a novel elicitor extracted from the brown sea algae (Sargassum fusiforme) to elicit induced resistance in tomato. The studied elicitor induced hypersensitive cell death and production in tomato tissues. It significantly reduced severities of late blight, grey mold, and powdery mildew of tomato. Taken together, our novel elicitor has not shown any direct antifungal activity against the studied pathogens, concluding that it is an elicitor of induced resistance.