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Antagonistic activity of Bacillus subtilis A18 – A19 against Heterobasidion species
KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
KTH, Skolan för bioteknologi (BIO), Miljömikrobiologi.
(Engelska)Artikel i tidskrift (Övrigt vetenskapligt) Submitted
Nationell ämneskategori
Kemi
Identifikatorer
URN: urn:nbn:se:kth:diva-121993OAI: oai:DiVA.org:kth-121993DiVA, id: diva2:619966
Anmärkning

QS 2013

Tillgänglig från: 2013-05-07 Skapad: 2013-05-07 Senast uppdaterad: 2013-05-07Bibliografiskt granskad
Ingår i avhandling
1. Microbes Associated with Hylobius abietis: A Chemical and Behavioral Study
Öppna denna publikation i ny flik eller fönster >>Microbes Associated with Hylobius abietis: A Chemical and Behavioral Study
2013 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This thesis is based on three inter-related studies: the first part deals with the microbial consortium, the identification of microbes and their volatiles, the second part deals with the study of bio-chemical control methods of two conifer pests; the pine weevil Hylobius abietis (L.) and the root rot fungi Heterobasidion spp., and the third part describes the production of styrene by a fungus using forest waste.The large pine weevil (Hylobius abietis L.) is an economically important pest insect of conifers in reforestation areas of Europe and Asia. The female weevils protect their eggs from feeding conspecifics by adding frass (mixture of weevil feces and chewed bark) along with the eggs. In order to understand the mechanism behind frass deposition at the egg laying site and to find repellents/antifeedants for pine weevils, microbes were isolated from the aseptically collected pine weevil frass. Microbial produced volatile organic compounds (VOCs) were collected by solid phase micro extraction and analyzed by GC-MS after cultivating them on weevil frass broth. The major VOCs were tested against pine weevils using a multi-choice olfactometer. Ewingella sp., Mucor racemosus, Penicillium solitum, P. expansum, Ophiostoma piceae, O. pluriannulatum, Debaryomyces hansenii and Candida sequanensis were identified as abundant microbes. Styrene, 6-protoilludene, 1-octene-3-ol, 3-methylanisole, methyl salicylate, 2-methoxyphenol and 2-methoxy-4-vinylphenol were the VOCs of persistently isolated microbes. In behavioral bioassay, methyl salicylate, 3-methylanisole and styrene significantly reduced the attraction of pine weevils to their host plant volatiles. Heterobasidion spp. are severe pathogenic fungi of conifers that cause root and butt rot in plants. Bacterial isolates were tested for the antagonistic activity against fungi on potato dextrose agar. Bacillus subtilis strains significantly inhibited the growth of H. annosum and H. parviporum. Styrene is an industrial chemical used for making polymeric products, currently produced from fossil fuel. A strain of Penicillium expansum isolated from pine weevil frass was investigated for the production of styrene using forest waste. Grated pine stem bark and mature oak bark supplemented with yeast extract produced greater amounts of styrene compared to potato dextrose broth.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2013. s. 66
Serie
Trita-CHE-Report, ISSN 1654-1081 ; 2013:23
Nyckelord
Hylobius, Ewingella, Penicillium, Heterobasidion, Bacteria, Fungi, Bark, Forest waste, Metabolites, Styrene, Methyl salicylate.
Nationell ämneskategori
Naturvetenskap Organisk kemi
Identifikatorer
urn:nbn:se:kth:diva-121887 (URN)978-91-7501-727-3 (ISBN)
Disputation
2013-05-30, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20130507

Tillgänglig från: 2013-05-07 Skapad: 2013-05-06 Senast uppdaterad: 2013-05-07Bibliografiskt granskad

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Av författaren/redaktören
Azeem, MuhammadBorg-Karlson, Anna KarinKuttuva Rajarao, Gunaratna
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Organisk kemiMiljömikrobiologi
Kemi

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