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J Biosci Bioeng

Title:		Metabolic changes in Citrus leaf volatiles in response to environmental stress
Author(s):		Asai T; Matsukawa T; Kajiyama S;
Address:		"Graduated School of Biology-Oriented Science and Technology, Kinki University, 930 Nishimitani, Kinokawa City, Wakayama, 649-6493, Japan. Graduated School of Biology-Oriented Science and Technology, Kinki University, 930 Nishimitani, Kinokawa City, Wakayama, 649-6493, Japan; Experimental Farm, Kinki University, Yuasa, Yuasa-cho, Arida-gun, Wakayama, 643-0004, Japan. Graduated School of Biology-Oriented Science and Technology, Kinki University, 930 Nishimitani, Kinokawa City, Wakayama, 649-6493, Japan. Electronic address: kajiyama@waka.kindai.ac.jp"
Journal Title:		J Biosci Bioeng
Year:		2016
Volume:		20150715
Issue:		2
Page Number:		235 - 241
DOI:		10.1016/j.jbiosc.2015.06.004
ISSN/ISBN:		1347-4421 (Electronic) 1347-4421 (Linking)
Abstract:		"Citrus plants are well known as a rich source of VOCs, and several have important roles in defense responses. However, how VOCs are regulated in response to environmental stress is not yet well understood. In this study, we investigated dynamic changes of VOCs present in leaves of seven Citrus species (Citrus sinensis, C. limon, C. paradisi, C. unshiu, C. kinokuni, C. grandis, and C. hassaku) in response to mechanical wounding, jasmonic acid (JA), and salicylic acid (SA) as determined by gas chromatography/mass spectrometric analysis followed by multivariate analysis (principal component analysis, PCA, and orthogonal partial least squares-discriminant analysis, OPLS-DA). PCA and OPLS-DA suggested that changes in VOC profiles against stress stimuli were much diverse among Citrus species. OPLS-DA showed that C6 volatiles, such as hexanal and trans-2-hexenal, were induced in response to JA and SA stimuli in C. sinensis and C. grandis, while the other VOCs were decreased under all tested stress conditions. alpha-Farnesene was induced in all species except C. hassaku after wounding or JA treatment. In addition, alpha-farnesene was also induced in response to SA stimuli in C. unshiu and C. kinokuni. Therefore these volatiles can be candidates of the common stress biomarkers in Citrus. Our results will give a new insight into defense mechanisms in Citrus species"
Keywords:		"Aldehydes/metabolism Citrus/drug effects/*metabolism Cyclopentanes/pharmacology *Environment Oxylipins/pharmacology Plant Leaves/drug effects/*metabolism Salicylic Acid/metabolism Sesquiterpenes/pharmacology *Stress, Physiological Volatile Organic Compoun;"
Notes:		"MedlineAsai, Tomonori Matsukawa, Tetsuya Kajiyama, Shin'ichiro eng Japan 2015/07/21 J Biosci Bioeng. 2016 Feb; 121(2):235-41. doi: 10.1016/j.jbiosc.2015.06.004. Epub 2015 Jul 15"