Comparing Sanger sequencing and high-throughput metabarcoding for inferring photobiont diversity in lichens.

Abstract:

:The implementation of HTS (high-throughput sequencing) approaches is rapidly changing our understanding of the lichen symbiosis, by uncovering high bacterial and fungal diversity, which is often host-specific. Recently, HTS methods revealed the presence of multiple photobionts inside a single thallus in several lichen species. This differs from Sanger technology, which typically yields a single, unambiguous algal sequence per individual. Here we compared HTS and Sanger methods for estimating the diversity of green algal symbionts within lichen thalli using 240 lichen individuals belonging to two species of lichen-forming fungi. According to HTS data, Sanger technology consistently yielded the most abundant photobiont sequence in the sample. However, if the second most abundant photobiont exceeded 30% of the total HTS reads in a sample, Sanger sequencing generally failed. Our results suggest that most lichen individuals in the two analyzed species, Lasallia hispanica and L. pustulata, indeed contain a single, predominant green algal photobiont. We conclude that Sanger sequencing is a valid approach to detect the dominant photobionts in lichen individuals and populations. We discuss which research areas in lichen ecology and evolution will continue to benefit from Sanger sequencing, and which areas will profit from HTS approaches to assessing symbiont diversity.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Paul F,Otte J,Schmitt I,Dal Grande F

doi

10.1038/s41598-018-26947-8

subject

Has Abstract

pub_date

2018-06-05 00:00:00

pages

8624

issue

1

issn

2045-2322

pii

10.1038/s41598-018-26947-8

journal_volume

8

pub_type

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