NDLI: Behavioural and physiological responses of infective juveniles of the entomopathogenic nematode Heterorhabditis to desiccation

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BioControl : Volume 46, Issue 2, June 2001

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Behavioural and physiological responses of infective juveniles of the entomopathogenic nematode Heterorhabditis to desiccation

Content Provider	Springer Nature Link
Author	O'Leary, Sean A. Power, Austin P. Stack, Colin M. Burnell, Ann M.
Copyright Year	2001
Abstract	Infective juveniles (IJs) of entomopathogenic nematodes (EPNs) are susceptible to a wide variety of environmental factors, including desiccation, which limit their usefulness as biocontrol agents. Although EPNs can be subjected to a gradual loss of water in their natural environment they are not full anhydrobiotes, being able to survive only moderate levels of desiccation at high relative humidities (rh). We investigated the desiccation tolerance of IJs of several Heterorhabditisspecies and strains when exposed to fast and slow desiccation regimes. We also investigated the behavioural and biochemical responses of Heterorhabditis IJs when exposed to 98% rh for 4 days. IJs of H. megidis UK211 (but not IJs of H. indica) aggregate into large clumps when desiccated at high rh, but unlike Steinernema spp., neither H. megidis nor H. indica IJs showed any tendency to coil. Preincubation of H. megidis UK211 IJs at high (98%) rh enhances their ability to survive for 150 min at 57% rh. We show that preincubation of H. megidis and H. indica at 98% rh induces the synthesis of glycerol but not of trehalose, whereas identical preincubation conditions do induce trehalose synthesis in Steinernema carpocapsae and Aphelenchus avenae. The biosynthesis of glycerol rather than trehalose by IJs of two species of Heterorhabditis in response to moderate levels of desiccation indicates that Heterorhabditis is unlikely to have the necessary metabolic responses to desiccation required to enable it to enter into a fully anhydrobiotic state.
Starting Page	345
Ending Page	362
Page Count	18
File Format	PDF
ISSN	13866141
Journal	BioControl
Volume Number	46
Issue Number	3
e-ISSN	15738248
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Evolutionary Biology Plant Sciences Plant Pathology Animal Systematics/Taxonomy/Biogeography
Content Type	Text
Resource Type	Article
Subject	Insect Science Agronomy and Crop Science

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