Time of day and stress from insect herbivores determine release of volatiles from rice plants
論文タイトル：Herbivore-induced and constitutive volatiles are controlled by different oxylipin-dependent mechanisms in rice
著者：Kadis Mujiono, Tilisa Tohi, Islam S Sobhy, Yuko Hojo, Tomonori Shinya, Ivan Galis
掲載論文：Plant, Cell and Environment (Online first)
Plants attacked by insect herbivores emit blends of volatile organic compounds to attract natural enemies of herbivores that are then used as plant’s bodyguards. In this work, we monitored herbivore-elicited volatiles in rice and found that several compounds, such as linalool, can be easily induced by herbivory stress. On the other hand, rice is also producing an array of other volatiles, many of which are released during day and suppressed at night (show diurnal emission pattern). We report that while herbivore-induced plant volatiles are triggered by plant hormone jasmonic acid, diurnal volatiles including caryophyllene in rice do not respond to jasmonate burst that is immediately triggered inside of rice by insect attack. Instead, diurnal volatiles followed the accumulation of 12-oxo-phytodienoic acid (OPDA), which is a well-known jasmonic acid precursor in the same oxylipin pathway. We therefore conclude that while both types of volatiles in rice depend on the oxylipin pathway, actual regulators for stress induced and diurnal volatiles may differ, and therefore these volatiles can show specific emission patterns from plants.
This work was widely supported by monitoring of volatile compounds in rice leaves and headspace, based on the original methods developed in the Plant-Insect Interactions Group, and by the use of Gas Chromatograph-Mass Spectrometer instrument located at the Okayama University Institute of Plant Science and Resources.
Group of Plant-Insect Interactions