Abstract
We investigated variations in the level and composition of volatiles emitted by tomato leaves at different ages. Our focus also included their antifungal properties and responses to chitosan oligosaccharide. Based on leaf position, the release of volatiles decreased over time. Young leaves produced high levels of C6-aldehyde, which is mainly composed of hexenal, while the volatiles emitted by more mature leaves largely comprised terpenes, particularly β-phellandrene and caryophyllane. In young upper leaves, the main components (up to 86% of the total) were hexenal, β-phellandrene, and caryophyllane. Their levels decreased steadily over time, from 386.3 μg g−1 fresh weight (FW) in young leaves to 113.2 μg g−1 FW in old tissues. Volatiles emitted from young leaves exhibited the best antifungal activity against spore germination and hyphal growth by Botrytis cinerea and Fusarium oxysporum. Leaves became more susceptible to oligosaccharide treatment with increasing age. When young tissues were exposed to chitosan, we found declines in both the quantity of volatiles and their ability to inhibit fungal growth. Compared with the control, the amount of volatiles from young tissues was 88.4% lower after such treatment. In contrast, contents of volatiles from old and adult leaves were dramatically increased by chitosan oligosaccharide. Likewise, their inhibitory effect was significantly enhanced. Therefore, our results suggest that these volatiles are responsible for antifungal activity and may play a role in age-related resistance by tomato.
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Acknowledgments
This research was financially supported by the Hi-Tech Research and Development (863) Program of China (No. 2007AA10Z334) and the Project of Science and Technology Development Plan in Shandong Province (2008GG10009014).
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Zhang, P., Chen, K. Age-Dependent Variations of Volatile Emissions and Inhibitory Activity Toward Botrytis cinerea and Fusarium oxysporum in Tomato Leaves Treated with Chitosan Oligosaccharide. J. Plant Biol. 52, 332–339 (2009). https://doi.org/10.1007/s12374-009-9043-9
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DOI: https://doi.org/10.1007/s12374-009-9043-9