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Plant Signal Behav

Title:		Possible role of plant volatiles in tolerance against huanglongbing in citrus
Author(s):		Hijaz F; Nehela Y; Killiny N;
Address:		"a Citrus Research and Education Center, IFAS, University of Florida , Lake Alfred , Florida , United States of America"
Journal Title:		Plant Signal Behav
Year:		2016
Volume:		11
Issue:		3
Page Number:		e1138193 -
DOI:		10.1080/15592324.2016.1138193
ISSN/ISBN:		1559-2324 (Electronic) 1559-2316 (Print) 1559-2316 (Linking)
Abstract:		"Volatile organic compounds (VOC) play an important role in protecting plants from insect and pathogen attack. In this study, we investigated the leaf volatile profiles of 14 citrus varieties. The VOC in citrus leaves were extracted with n-hexane and analyzed using gas chromatography-mass spectrometry (GC-MS). Overall, 4six volatile compounds were identified in the n-hexane extract from citrus leaves. Most of the detected compounds belonged to 3 main groups (monoterpenes, sesquiterpenes, and aliphatic aldehydes). Principle component analysis was used to examine the relative distribution of the studied varieties to each other. Interestingly, volatile profiles of varieties that are tolerant to Candidatus Liberibacter asiaticus (CLas) were different from those of the susceptible ones. Tolerant and moderately-tolerant cultivars contained relatively higher amounts of volatiles than susceptible varieties. In addition, tolerant varieties were also higher in specific compounds which are known for their antimicrobial activities. These compounds include Aldehydes (undecanal, neral, geranial, and citronellal) and some monoterpenes such as linalool, d-limonene, myrcene, alpha- and beta- phellandrene. In addition, some sesquiterpene compounds including t-caryophellene, gamma-elemene, beta-elemene, germacrene D, and geranyl acetate were higher in tolerant and moderately tolerant cultivars. Severinia buxifolia which is known for its tolerance to CLas and many other pathogens contained higher levels of santalenes and coumarins. Our results indicated that citrus leaf volatiles might play a role in citrus tolerance to CLas. The results of this study may help in understanding of the mechanism of citrus tolerance against CLas"
Keywords:		Analysis of Variance Citrus/*chemistry/microbiology Cluster Analysis Disease Resistance Gas Chromatography-Mass Spectrometry Multivariate Analysis Plant Leaves/chemistry Principal Component Analysis Rhizobiaceae Species Specificity Volatile Organic Compou;
Notes:		"MedlineHijaz, Faraj Nehela, Yasser Killiny, Nabil eng Comparative Study Research Support, Non-U.S. Gov't 2016/02/02 Plant Signal Behav. 2016; 11(3):e1138193. doi: 10.1080/15592324.2016.1138193"