Indirect interaction between an unspecialized endophytic fungus and a polyphagous moth

Jallow, Mustapha F. A.; Dugassa‐Gobena, Dereje; Vidal, Stefan

doi:10.1078/1439-1791-00224

Cited by 61 publications

(52 citation statements)

References 26 publications

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“…Plants inoculated with A. strictum exhibited an increased attractiveness for egg laying in other herbivorous insects as well, however, larvae feeding on these plants suffer from a reduction in growth rate, prolonged developmental time, suppressed moulting, and subsequently a higher mortality rate (Vidal 1996;Raps and Vidal 1998;Dugassa-Gobena et al 2003;Jallow et al 2003). The results reported by Rabin and Pacovsky (1985) or Gange and West (1994) fit into the pattern analysed by Gange et al (2002).…”

Section: Fig 3 Mean Percentages (±Sd) Of Number Of Times Tetheredsupporting

confidence: 63%

“…However, it is unlikely that changes in egg laying behaviour of our test insect on endophyte-infected plants can be related to phytosterol composition. On the other hand, larvae feeding on infected plants have to cope with a low nutritional quality of the food ingested, which results from changes in the ratio of phytosterols to other secondary metabolites (DugassaGobena et al 1998;Raps and Vidal 1998;Jallow et al 2003). So far we do not know whether the biochemical traits involved are triggered directly by the growth of the fungal endophyte, or indirectly mediated by the plant in response to the fungal infection.…”

Section: Fig 3 Mean Percentages (±Sd) Of Number Of Times Tetheredmentioning

confidence: 97%

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Influence of an endophytic fungus on host plant selection by a polyphagous moth via volatile spectrum changes

Jallow

Dugassa‐Gobena

Vidal

2008

Arthropod-Plant Interactions

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Recently the role of micro-organisms as mediators of plant-herbivore interactions has been increasingly acknowledged in ecological research. We investigated the interaction between an unspecialized root fungal endophyte (Acremonium strictum) and the polyphagous moth Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae), in greenhouse and laboratory bioassays. Specifically we examined in tomato (Lycopersicon esculentum Mill.) the systemic effects of the endophytic fungus on the host selection behaviour of female moths for oviposition and the volatile profiles of host plants to understand the mechanisms acting in this multi-trophic model system. Both laboratory and field strains of H. armigera moths oviposited more on leaves of A. strictum inoculated plants as compared to endophyte-free plants, both in free flight cages and in tethered moth laboratory experiments; the moth's preferences were significant between 10 and 18 days after inoculation. The analysis of volatile profiles showed strong quantitative differences between treatments. Endophyte inoculated plants emitted diverse terpenes and sesquiterpenes at significantly lower amounts as compared to endophyte free-plants, except for a-terpinene, which did not differ between the treatments, and trans-bcaryophyllene, which was emitted in significantly higher amounts on inoculated plants. b-Thujene and a-phellandrene accounted for 73.3 and 12.0% of total amounts of volatiles emitted from endophyte-free and inoculated plants, respectively. Our findings demonstrate that A. strictum is able to systemically influence the host selection of H. armigera moths for oviposition; conceivably mediated by the induced changes in volatile emissions (and probably additional biochemical parameters of the host plants, which have not been analysed so far). We argue for a more detailed assessment of micro-organisms invisibly colonizing plants, when studying plant-herbivore or multitrophic interactions.

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Section: Fig 3 Mean Percentages (±Sd) Of Number Of Times Tetheredsupporting

confidence: 63%

Section: Fig 3 Mean Percentages (±Sd) Of Number Of Times Tetheredmentioning

confidence: 97%

Influence of an endophytic fungus on host plant selection by a polyphagous moth via volatile spectrum changes

Jallow

Dugassa‐Gobena

Vidal

2008

Arthropod-Plant Interactions

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“…Fewer studies have explored this relationship in nongrass systems. However, Jallow et al (2004) reported drastic negative effects on larvae of Helicoverpa armigera Hü bner reared on tomato plants infected with a nongrass endophyte, Acremonium strictum W. Gams. Some endophytes belong to genera that include fungal entomopathogens such as Beauveria (Ascomycota: Hypocreales).…”

Section: Introductionmentioning

confidence: 99%

Entomopathogenic fungal endophytes

Vega¹,

Posada²,

Aime³

et al. 2008

Biological Control

414

231

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Fungal endophytes are quite common in nature and some of them have been shown to have adverse effects against insects, nematodes, and plant pathogens.Our research program is aimed at using fungal endophytes-mediated plant defense as a novel biological control mechanism against the coffee berry borer, the most devastating pest of coffee throughout the world. A survey of fungal endophytes in coffee plants from Hawaii, Colombia, Mexico, and Puerto Rico has revealed the presence of various genera of fungal entomopathogens, including Acremonium, Beauveria, Cladosporium, Clonostachys, and Paecilomyces. Two of these, B. bassiana and Clonostachys rosea, were tested against the coffee berry borer and were shown to be pathogenic. This paper reviews the possible mode of action of entomopathogenic fungal endophytes. Published by Elsevier Inc.

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“…Fungal endophytes play an important role in protecting plants against herbivorous insects (Jallow et al 2004(Jallow et al , 2008 and plant pathogens (Ownley et al 2008). Beauveria bassiana has been reported as an endophyte in a variety of plants, including maize Lewis 1991, 1992a, b;Wagner and Lewis 2000), Theobroma gileri (Evans et al 2003), Carpinus caroliniana (Bills and Polishook 1991), in seeds and needles of Pinus monticola (Ganley and Newcombe 2005) in opium poppies (Quesada-Moraga et al 2006), in banana tissue cultures (Akello et al 2007), and in coffee (Posada et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Effect of inoculation method and plant growth medium on endophytic colonization of sorghum by the entomopathogenic fungus Beauveria bassiana

2009

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A study was conducted to determine the effect of inoculation method and plant growth medium on colonization of sorghum by an endophytic Beauveria bassiana. Colonization of leaves, stems, and roots by B. bassiana was assessed 20-days after application of the fungus. Although B. bassiana established as an endophyte in sorghum leaves, stems, and roots regardless of inoculation method (leaf, seed, or soil inoculation), plant growth medium (sterile soil, non-sterile soil, or vermiculite) apparently influenced colonization rates. Seed inoculation with conidia caused no stem or leaf colonization by the fungus in non-sterile soil but did result in substantial endophytic colonization in vermiculite and sterile soil. Leaf inoculation did not result in root colonization, regardless of plant growth medium. Endophytic colonization was greater in leaves and stems than roots. Endophytic colonization by B. bassiana had no adverse effects on the growth of sorghum plants. Leaf inoculation with a conidial suspension proved to be the best method to introduce B. bassiana into sorghum leaves for plants growing in either sterile or nonsterile soil. Further research should focus on the virulence of endophytic B. bassiana against sorghum stem borers.

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Indirect interaction between an unspecialized endophytic fungus and a polyphagous moth

Cited by 61 publications

References 26 publications

Influence of an endophytic fungus on host plant selection by a polyphagous moth via volatile spectrum changes

Influence of an endophytic fungus on host plant selection by a polyphagous moth via volatile spectrum changes

Entomopathogenic fungal endophytes

Effect of inoculation method and plant growth medium on endophytic colonization of sorghum by the entomopathogenic fungus Beauveria bassiana

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