« Previous Abstract"[Allergic airway diseases: epidemiology, diagnostic and therapeutic guidelines]"    Next AbstractInfluence of zinc hyperaccumulation on glucosinolates in Thlaspi caerulescens »

J Chem Ecol

Title:		Molasses Grass Induces Direct and Indirect Defense Responses in Neighbouring Maize Plants
Author(s):		Tolosa TA; Tamiru A; Midega CAO; van den Berg J; Birkett MA; Woodcock CM; Bruce TJA; Kelemu S; Pickett JA; Khan ZR;
Address:		"International Centre of Insect Physiology and Ecology, P.O. Box 30772-00100, Nairobi, Kenya. Unit for Environmental Sciences and Management, North-West University, Potchefstroom, 2520, South Africa. Department of Agriculture Food and Resource Sciences, University of Maryland Eastern Shore, Princess Anne, MD, 21853, USA. International Centre of Insect Physiology and Ecology, P.O. Box 30772-00100, Nairobi, Kenya. atamiru@icipe.org. Biointeractions and Crop Protection Department, Rothamsted Research, Harpenden, Herts, AL5 2JQ, UK. School of Life Sciences, Keele University, Staffordshire, ST5 5BG, UK. School of Chemistry, Cardiff University, Cardiff, CF10 3AT, UK"
Journal Title:		J Chem Ecol
Year:		2019
Volume:		20191129
Issue:		11-Dec
Page Number:		982 - 992
DOI:		10.1007/s10886-019-01122-z
ISSN/ISBN:		1573-1561 (Electronic) 0098-0331 (Linking)
Abstract:		"Plants have evolved intricate defence strategies against herbivore attack which can include activation of defence in response to stress-related volatile organic compounds (VOCs) emitted by neighbouring plants. VOCs released by intact molasses grass (Melinis minutiflora), have been shown to repel stemborer, Chilo partellus (Swinhoe), from maize and enhance parasitism by Cotesia sesamiae (Cameron). In this study, we tested whether the molasses grass VOCs have a role in plant-plant communication by exposing different maize cultivars to molasses grass for a 3-week induction period and then observing insect responses to the exposed plants. In bioassays, C. partellus preferred non-exposed maize landrace plants for egg deposition to those exposed to molasses grass. Conversely, C. sesamiae parasitoid wasps preferred volatiles from molasses grass exposed maize landraces compared to volatiles from unexposed control plants. Interestingly, the molasses grass induced defence responses were not observed on hybrid maize varieties tested, suggesting that the effect was not simply due to absorption and re-emission of VOCs. Chemical and electrophysiological analyses revealed strong induction of bioactive compounds such as (R)-linalool, (E)-4,8-dimethyl-1,3,7-nonatriene and (E,E)-4,8,12-trimethyl-1,3,7,11-tridecatetraene from maize landraces exposed to molasses grass volatiles. Our results suggest that constitutively emitted molasses grass VOCs can induce direct and indirect defence responses in neighbouring maize landraces. Plants activating defences by VOC exposure alone could realize enhanced levels of resistance and fitness compared to those that launch defence responses upon herbivore attack. Opportunities for exploiting plant-plant signalling to develop ecologically sustainable crop protection strategies against devastating insect pests such as stemborer C. partellus are discussed"
Keywords:		"Acyclic Monoterpenes/chemistry/metabolism Animals Crops, Agricultural Female Gas Chromatography-Mass Spectrometry/methods Herbivory Host-Parasite Interactions Molasses Moths/parasitology Oviposition/drug effects Volatile Organic Compounds/*chemistry/metab;"
Notes:		"MedlineTolosa, Tigist A Tamiru, Amanuel Midega, Charles A O Van Den Berg, Johnnie Birkett, Michael A Woodcock, Christine M Bruce, Toby J A Kelemu, Segenet Pickett, John A Khan, Zeyaur R eng IBCARP Push-Pull/EU/ 2019/12/01 J Chem Ecol. 2019 Dec; 45(11-12):982-992. doi: 10.1007/s10886-019-01122-z. Epub 2019 Nov 29"