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Propylene Glycol and Non-Destructive DNA Extractions Enable Preservation and Isolation of Insect and Hosted Bacterial DNA

Authors :
Francesco Martoni
Elisse Nogarotto
Alexander M. Piper
Rachel Mann
Isabel Valenzuela
Lixin Eow
Lea Rako
Brendan C. Rodoni
Mark J. Blacket
Source :
Agriculture, Vol 11, Iss 1, p 77 (2021)
Publication Year :
2021
Publisher :
MDPI AG, 2021.

Abstract

Plant bio-protection and biosecurity programs worldwide use trap-based surveillance for the early detection of agricultural pests and pathogens to contain their incursions and spread. This task is reliant on effective preservation in insect traps, which is required to maintain specimen quality for extended periods under variable environmental conditions. Furthermore, with traditional morphological examinations now increasingly paired with modern molecular diagnostic techniques, insect traps are required to preserve both the specimens’ morphology and the DNA of insects and vectored bacterial pathogens. Here, we used psyllids (Hemiptera) and their hosted bacteria as a model to test the preservative ability of propylene glycol (PG): a non-flammable, easily transportable preservative agent that could be used in pitfall, suction or malaise traps. We tested preservation using various PG concentrations, at different temperatures and for multiple time periods, paired with non-destructive DNA extraction methods, which allow isolation of both insect and arbobacterial DNA while retaining a morphological voucher of the insect host specimens. PG concentrations between 40% and 100% performed best for both insect and bacterial DNA preservation up to 28 days. Ultimately, given the viscous nature of PG at high concentrations, we recommend using it at a concentration between 40% and 60% to enable insects to sink into the solution, thus enhancing DNA preservation.

Details

Language :
English
ISSN :
20770472
Volume :
11
Issue :
1
Database :
Directory of Open Access Journals
Journal :
Agriculture
Publication Type :
Academic Journal
Accession number :
edsdoj.898ad96e2284458182d494e999b901a2
Document Type :
article
Full Text :
https://doi.org/10.3390/agriculture11010077