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Titolo:
Behavioural and physiological responses of infective juveniles of the entomopathogenic nematode Heterorhabditis to desiccation
Autore:
OLeary, SA; Power, AP; Stack, CM; Burnell, AM;
Indirizzi:
Natl Univ Ireland, Dept Biol, Inst Bioengn & Agroecol, Maynooth, Kildare, Ireland Natl Univ Ireland Maynooth Kildare Ireland l, Maynooth, Kildare, Ireland
Titolo Testata:
BIOCONTROL
fascicolo: 3, volume: 46, anno: 2001,
pagine: 345 - 362
SICI:
1386-6141(2001)46:3<345:BAPROI>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
EVAPORATIVE WATER-LOSS; MEGIDIS STRAIN UK211; LONG-TERM STORAGE; FUNCTIONAL INTEGRITY; STEINERNEMA-FELTIAE; BIOLOGICAL MEMBRANE; SURVIVAL; ANHYDROBIOSIS; TREHALOSE; GLYCEROL;
Keywords:
anhydrobiosis; desiccation; glycerol; HPLC; trehalose; Aphelenchus avenae; Heterorhabditis; Steinernema;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Burnell, AM Natl Univ Ireland, Dept Biol, Inst Bioengn & Agroecol, Maynooth, Kildare, Ireland Natl Univ Ireland Maynooth Kildare Ireland Kildare, Ireland
Citazione:
S.A. O'Leary et al., "Behavioural and physiological responses of infective juveniles of the entomopathogenic nematode Heterorhabditis to desiccation", BIOCONTROL, 46(3), 2001, pp. 345-362

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 desiccationat high relative humidities (rh). We investigated the desiccation tolerance of IJs of several Heterorhabditis species 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 Steinernemacarpocapsae 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 havethe necessary metabolic responses to desiccation required to enable it to enter into a fully anhydrobiotic state.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/08/20 alle ore 07:01:06